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공개 퀴즈 목록 (259개 중 101-120)
| ID | 과목 | 파일명 | 문제 수 | 퀴즈 타입 | 소유자 | 통계 조회/가져오기 |
등록일 | 작업 |
|---|---|---|---|---|---|---|---|---|
| 671 | 🔬 Science |
science_quiz4_7_motion_graphs
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 670 | 🔬 Science |
science_quiz4_6_pressure
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 669 | 🔬 Science |
science_quiz4_5_momentum_conservation
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 668 | 🔬 Science |
science_quiz4_4_gravity_mass_weight
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 667 | 🔬 Science |
science_quiz4_3_friction_air_resistance
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 666 | 🔬 Science |
science_quiz4_2_newtons_third_law
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 665 | 🔬 Science |
science_quiz4_1_newtons_first_second_laws
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 664 | 🔬 Science |
science_quiz3_8_energy_sustainability
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 663 | 🔬 Science |
science_quiz3_7_fossil_fuels
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 662 | 🔬 Science |
science_quiz3_6_renewable_energy
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 661 | 🔬 Science |
science_quiz3_5_conservation_of_energy
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 660 | 🔬 Science |
science_quiz3_4_work_power_machines
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 659 | 🔬 Science |
science_quiz3_3_heat_transfer
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 658 | 🔬 Science |
science_quiz3_2_energy_transformations
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 657 | 🔬 Science |
science_quiz3_1_forms_of_energy
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 656 | 🔬 Science |
science_quiz2_8_conservation_of_mass
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 655 | 🔬 Science |
science_quiz2_7_redox_reactions
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
| 654 | 🔬 Science |
science_quiz2_6_oxidation_reduction
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
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| 653 | 🔬 Science |
science_quiz2_5_neutralization
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
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| 652 | 🔬 Science |
science_quiz2_4_ph_indicators
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-02-22 16:53:46 |
|
📖 science_quiz4_7_motion_graphs
On distance-time graph, horizontal line means:
1. Object is stationary ✓
2. Constant speed
3. Accelerating
4. Decelerating
On distance-time graph, straight diagonal line means:
1. Constant speed ✓
2. Deceleration
3. Acceleration
4. At rest
On distance-time graph, curve getting steeper means:
1. Speeding up (accelerating) ✓
2. Stationary
3. Constant speed
4. Slowing down
On distance-time graph, curve getting flatter means:
1. Constant speed
2. Stationary
3. Speeding up
4. Slowing down (decelerating) ✓
Slope of distance-time graph represents:
1. Acceleration
2. Mass
3. Speed ✓
4. Force
Distance-time graph from (0,0) to (10,50). Speed is:
1. 500 m/s
2. 50 m/s
3. 10 m/s
4. 5 m/s ✓
On velocity-time graph, horizontal line means:
1. At rest
2. Constant velocity ✓
3. Accelerating
4. Changing direction
On velocity-time graph, line on time axis (v=0) means:
1. Stationary ✓
2. Maximum speed
3. Constant velocity
4. Accelerating
On velocity-time graph, sloping up line means:
1. Decelerating
2. Accelerating ✓
3. At rest
4. Constant velocity
On velocity-time graph, sloping down line means:
1. Constant velocity
2. Decelerating ✓
3. At rest
4. Accelerating
Slope of velocity-time graph represents:
1. Speed
2. Acceleration ✓
3. Distance
4. Force
Area under velocity-time graph represents:
1. Speed
2. Force
3. Displacement ✓
4. Acceleration
Velocity-time graph: v goes from 0 to 20 m/s in 5 s. Acceleration is:
1. 25 m/s²
2. 4 m/s² ✓
3. 100 m/s²
4. 20 m/s²
Velocity-time graph: v goes from 30 to 10 m/s in 4 s. Acceleration is:
1. 5 m/s²
2. 20 m/s²
3. -5 m/s² ✓
4. 40 m/s²
Constant velocity of 10 m/s for 5 s. Distance traveled:
1. 15 m
2. 10 m
3. 2 m
4. 50 m ✓
Velocity-time graph: triangle with base 10 s, height 20 m/s from zero. Distance:
1. 100 m ✓
2. 10 m
3. 30 m
4. 200 m
Negative velocity on v-t graph means:
1. Error in measurement
2. Slowing down
3. Moving in opposite/negative direction ✓
4. Not moving
On d-t graph, can distance decrease (line go down)?
1. Yes, when at rest
2. Yes, when decelerating
3. Yes, when moving backward
4. No, distance cannot decrease ✓
To find velocity from d-t graph:
1. Find y-intercept
2. Calculate area under curve
3. Find x-intercept
4. Calculate slope ✓
To find acceleration from v-t graph:
1. Find maximum value
2. Find y-intercept
3. Calculate area under curve
4. Calculate slope ✓
Car accelerates from rest to 25 m/s in 5 s, then constant 25 m/s for 10 s. Total distance:
1. 62.5 m
2. 187.5 m
3. 125 m
4. 312.5 m ✓
On v-t graph, what does the x-intercept represent?
1. Time when velocity becomes zero ✓
2. Acceleration
3. Distance
4. Maximum velocity
Steeper slope on d-t graph means:
1. Higher speed ✓
2. More acceleration
3. Less acceleration
4. Lower speed
On v-t graph, area above and below time axis:
1. Both mean same thing
2. Below = error
3. Above = faster only
4. Above = forward displacement, below = backward ✓
Average speed from d-t graph:
1. Area under curve
2. Slope at midpoint
3. Total distance / total time ✓
4. Maximum slope
📖 science_quiz4_6_pressure
Pressure is defined as:
1. Force per unit area ✓
2. Force times area
3. Force times distance
4. Force divided by time
Pressure formula:
1. P = F/A ✓
2. P = m×a
3. P = ρgh only
4. P = F×A
SI unit of pressure:
1. Watt (W)
2. Newton (N)
3. Joule (J)
4. Pascal (Pa) ✓
1 Pascal equals:
1. 1 N/m² ✓
2. 1 J/m²
3. 1 m/s²
4. 1 kg/m²
Same force on smaller area results in:
1. Zero pressure
2. Higher pressure ✓
3. Lower pressure
4. Same pressure
Why does knife cut easily?
1. Knife is heavy
2. Knife is metal
3. Sharp edge = small area = high pressure ✓
4. Knife is long
Why do snowshoes prevent sinking?
1. Small area = high pressure
2. They're made of wood
3. They're waterproof
4. Large area = low pressure ✓
Thumb tack has:
1. Sharp point (high P into wall) and flat head (low P on thumb) ✓
2. Sharp point on both ends
3. No special design
4. Flat on both ends
Pressure in liquid increases with:
1. Width of container
2. Total volume
3. Depth ✓
4. Container shape
Formula for liquid pressure:
1. P = mv
2. P = F/A only
3. P = ρgh ✓
4. P = mgh
Atmospheric pressure at sea level:
1. About 101,325 Pa (1 atm) ✓
2. Zero
3. 9.8 Pa
4. Infinite
Why don't we feel atmospheric pressure?
1. We're too small
2. Internal body pressure equals external ✓
3. It doesn't exist
4. Air has no mass
Atmospheric pressure decreases with:
1. Latitude
2. Altitude ✓
3. Depth
4. Temperature alone
At 10 m depth in water, pressure is about:
1. 10 atmospheres
2. 1 atmosphere
3. 2 atmospheres (1 atm + 1 atm from water) ✓
4. 0 atmospheres
Pascal's Principle states:
1. Pressure increases with depth
2. Pressure applied to fluid transmitted throughout ✓
3. Liquids are incompressible
4. Pressure equals force over area
Hydraulic systems work based on:
1. Pascal's Principle ✓
2. Bernoulli's Principle
3. Archimedes' Principle
4. Boyle's Law
In hydraulic system, small piston (0.01 m²) with 50 N force. Large piston (0.1 m²) produces:
1. 50 N
2. 5 N
3. 500 N ✓
4. Cannot determine
Hydraulic car brakes:
1. Multiply force from pedal to brake pads ✓
2. Reduce force
3. Keep force same
4. Eliminate force
Buoyant force is:
1. Weight of object
2. Upward force exerted by fluid on object ✓
3. Force propelling boat
4. Downward force on object
Archimedes' Principle:
1. Buoyant force = weight of fluid displaced ✓
2. Buoyant force = weight of object
3. Buoyant force = volume
4. Buoyant force = pressure
Object floats when:
1. Buoyant force < weight
2. Object is small
3. Object is light
4. Buoyant force ≥ weight ✓
Object sinks when:
1. Object is heavy
2. Buoyant force > weight
3. Object is large
4. Buoyant force < weight (object denser than fluid) ✓
Steel ship floats because:
1. Hollow shape displaces large volume of water ✓
2. Water holds it up
3. Steel is light
4. Magic
Submarine dives by:
1. Filling ballast tanks with water (increasing density) ✓
2. Emptying tanks
3. Increasing speed
4. Swimming down
Hot air balloon rises because:
1. Hot air less dense than cold air ✓
2. Hot air weighs more
3. Wind pushes it up
4. Helium inside
📖 science_quiz4_5_momentum_conservation
Momentum is defined as:
1. Mass times acceleration
2. Force times distance
3. Mass times velocity ✓
4. Force times time
Momentum formula:
1. p = ma
2. p = mgh
3. p = mv ✓
4. p = Ft
Unit of momentum:
1. J
2. W
3. N
4. kg·m/s ✓
Momentum is a:
1. Vector quantity ✓
2. Constant
3. Scalar quantity
4. Dimensionless quantity
A 10 kg object moving at 5 m/s has momentum:
1. 2 kg·m/s
2. 50 kg·m/s ✓
3. 15 kg·m/s
4. 50 N
Stationary objects have momentum of:
1. Cannot determine
2. Zero ✓
3. Infinite
4. Depends on mass
Law of Conservation of Momentum states:
1. Momentum is always zero
2. Momentum always increases
3. Total momentum before = total after (isolated system) ✓
4. Momentum equals force
Conservation of momentum applies:
1. Only in isolated systems (no external forces) ✓
2. Only on Earth
3. Only in collisions
4. Always, everywhere
In elastic collision:
1. Neither conserved
2. Only KE conserved
3. Only momentum conserved
4. Both momentum and KE conserved ✓
In inelastic collision:
1. Only momentum conserved ✓
2. Only KE conserved
3. Neither conserved
4. Both momentum and KE conserved
In perfectly inelastic collision:
1. Objects stick together ✓
2. Objects bounce apart perfectly
3. No momentum conserved
4. KE is conserved
Two identical cars collide head-on at same speed. After collision:
1. Both at rest (if perfectly inelastic) ✓
2. One stops, one continues
3. Both continue backward
4. Both continue forward
Impulse is defined as:
1. Change in momentum ✓
2. Force times distance
3. Energy transferred
4. Mass times velocity
Impulse can also be calculated as:
1. Power times distance
2. Force times time ✓
3. Mass times acceleration
4. Work divided by time
Impulse-Momentum theorem:
1. F·Δt = Δp ✓
2. W = Fd
3. KE = ½mv²
4. F = ma
To reduce force in collision, you should:
1. Decrease collision time
2. Increase momentum
3. Increase mass
4. Increase collision time ✓
Airbags work by:
1. Increasing force
2. Increasing collision time ✓
3. Decreasing momentum
4. Stopping car faster
Crumple zones in cars:
1. Eliminate momentum
2. Make car heavier
3. Increase speed
4. Extend collision time ✓
When catching ball, you pull glove back to:
1. Increase contact time, reduce force ✓
2. Look professional
3. Stop ball faster
4. Increase force
Follow-through in hitting ball:
1. Looks good only
2. Decreases impulse
3. Stops ball faster
4. Increases contact time, increases impulse ✓
1000 kg car at 20 m/s collides with stationary 1000 kg car. They stick. Final velocity:
1. 0 m/s
2. 10 m/s ✓
3. 20 m/s
4. 5 m/s
Two skaters (50 kg and 75 kg) push off. 50 kg moves at 3 m/s. 75 kg moves at:
1. 3 m/s
2. 2 m/s (opposite direction) ✓
3. 1.5 m/s
4. 4.5 m/s
Recoil of gun when fired is due to:
1. Friction
2. Conservation of momentum ✓
3. Gravity
4. Air resistance
Why does bullet have higher speed than gun recoil?
1. Gun has less mass
2. Bullet has much less mass ✓
3. Momentum not conserved
4. Forces are unequal
Momentum conservation is based on:
1. Newton's First Law only ✓
2. Law of Gravitation
3. Newton's Third Law
4. Newton's Second Law only
📖 science_quiz4_4_gravity_mass_weight
Mass is:
1. How fast object moves
2. Amount of matter in object ✓
3. How big object is
4. Force of gravity on object
Weight is:
1. Force of gravity on object ✓
2. Amount of matter
3. Always constant
4. Same as mass
Unit of mass:
1. Kilogram (kg) ✓
2. Second (s)
3. Meter (m)
4. Newton (N)
Unit of weight:
1. Newton (N) ✓
2. Kilogram (kg)
3. Meter (m)
4. Joule (J)
Your mass on Moon vs. Earth:
1. Zero on Moon
2. Less on Moon
3. Same ✓
4. More on Moon
Your weight on Moon vs. Earth:
1. Zero on Moon
2. More on Moon
3. Same
4. Less on Moon (about 1/6th) ✓
Weight formula:
1. W = mv
2. W = mg ✓
3. W = ma
4. W = ½mv²
What is g on Earth?
1. 9.8 m/s² ✓
2. 10 kg
3. 1 m/s
4. 9.8 N
What does g represent?
1. Acceleration due to gravity ✓
2. Gram
3. Gravity constant
4. Mass
A 5 kg object on Earth (g=9.8 m/s²) weighs:
1. 49 kg
2. 5 N
3. 49 N ✓
4. 5 kg
Object weighs 100 N on Earth. Its mass is:
1. 980 kg
2. About 10.2 kg
3. 100 kg ✓
4. Cannot determine
60 kg person on Moon (g=1.6 m/s²) weighs:
1. 588 N
2. 96 N ✓
3. 60 N
4. 60 kg
Which has strongest gravity (highest g)?
1. Jupiter ✓
2. Moon
3. Mars
4. Earth
Newton's Universal Law of Gravitation states:
1. Gravity only works on Earth
2. Only planets have gravity
3. All masses attract each other ✓
4. Heavier objects fall faster
Gravitational force is proportional to:
1. Sum of masses
2. Ratio of masses
3. Product of masses ✓
4. Difference of masses
Gravitational force is inversely proportional to:
1. Mass squared
2. Distance
3. Mass
4. Distance squared ✓
If distance between two masses doubles, gravitational force:
1. Doubles
2. Becomes 1/2
3. Quadruples
4. Becomes 1/4 ✓
Why don't we feel gravitational attraction to nearby people?
1. We're shielded
2. Their mass is too small ✓
3. They're too close
4. Gravity doesn't work that way
Astronauts in ISS float because:
1. They're too far from Earth
2. There's no gravity there
3. They're in continuous free fall (orbit) ✓
4. They have no weight
Gravity at ISS altitude (~400 km) is:
1. Zero
2. About 90% of surface value ✓
3. Exactly same as surface
4. About 10% of surface value
What is orbit?
1. Continuous free fall while moving forward ✓
2. Moving very slowly
3. Being far from gravity
4. Floating in space
True weightlessness occurs:
1. Underground
2. Far from any mass ✓
3. In orbit
4. On airplane
Do all objects fall at same rate in vacuum?
1. Only similar masses
2. Yes, regardless of mass ✓
3. No, heavier falls faster
4. No, lighter falls faster
On Earth, feather falls slower than rock because:
1. Air resistance affects feather more ✓
2. Feather has less mass
3. Feather is lighter
4. Feather has less gravity
Mass measures:
1. Inertia (resistance to acceleration) ✓
2. Speed
3. Energy
4. Gravitational force
📖 science_quiz4_3_friction_air_resistance
What is friction?
1. Force opposing motion between surfaces ✓
2. Force pushing objects up
3. Force pulling objects down
4. Force making objects accelerate
Friction always acts:
1. Opposite to direction of motion ✓
2. Downward only
3. In direction of motion
4. Perpendicular to motion
Friction is caused by:
1. Gravity
2. Magnetism
3. Air pressure
4. Microscopic irregularities in surfaces ✓
Which has more friction: rubber on concrete or ice on ice?
1. Both equal
2. Ice on ice
3. Rubber on concrete ✓
4. Neither has friction
Friction formula is:
1. Ff = μFN ✓
2. Ff = ma
3. Ff = ½mv²
4. Ff = mgh
What is μ (mu)?
1. Mass
2. Coefficient of friction ✓
3. Velocity
4. Acceleration
Normal force (FN) is:
1. Parallel force from surface
2. Gravitational force
3. Perpendicular force from surface ✓
4. Applied force
Static friction is friction when:
1. Objects are in air
2. Objects are falling
3. Objects are not moving relative to each other ✓
4. Objects are moving
Kinetic friction is friction when:
1. Objects are falling freely
2. Objects are in space
3. Objects are stationary
4. Objects are sliding ✓
Which is typically larger?
1. Static friction ✓
2. Kinetic friction
3. Depends on material only
4. Both equal
Rolling friction compared to sliding friction:
1. Much less ✓
2. Much more
3. Is zero
4. About the same
Does contact area affect friction for solids?
1. Yes, more area = more friction
2. No, doesn't affect it ✓
3. Yes, more area = less friction
4. Only for liquids
To reduce friction, you can:
1. Add more mass
2. Add lubricant ✓
3. Roughen surfaces
4. Increase normal force
To increase friction, you can:
1. Add lubricant
2. Roughen surfaces ✓
3. Reduce normal force
4. Smooth surfaces
Air resistance is:
1. Solid friction
2. Normal force
3. Gravitational force
4. Fluid friction with air ✓
Air resistance increases with:
1. Speed only
2. Mass
3. Volume only
4. Speed squared ✓
Air resistance depends on:
1. Color only
2. Temperature only
3. Mass only
4. Speed, shape, and frontal area ✓
What is terminal velocity?
1. Speed when hitting ground
2. Speed at takeoff
3. Maximum possible speed
4. Constant speed when drag equals weight ✓
Skydiver reaches terminal velocity when:
1. Air resistance equals zero
2. Parachute opens
3. Air resistance equals weight ✓
4. Speed reaches maximum possible
To decrease terminal velocity, skydiver should:
1. Spread out (increase area) ✓
2. Make body streamlined
3. Go higher
4. Gain mass
Streamlined shapes have:
1. Same air resistance as any shape ✓
2. No air resistance
3. Lower air resistance
4. Higher air resistance
Why is it harder to start pushing a heavy box than to keep it moving?
1. Kinetic friction > static friction
2. Box gets lighter
3. Friction disappears
4. Static friction > kinetic friction ✓
Snowshoes prevent sinking because:
1. They add friction
2. Small area reduces pressure
3. They eliminate friction
4. Large area reduces pressure ✓
What percentage of car engine energy is typically lost to friction?
1. About 75% ✓
2. About 10%
3. About 1%
4. 0% (perfect efficiency)
Friction is beneficial for:
1. Perpetual motion
2. Engine efficiency
3. Reducing air resistance
4. Walking and braking ✓
📖 science_quiz4_2_newtons_third_law
Newton's Third Law states:
1. Gravity attracts all masses
2. Objects resist changes in motion
3. Force equals mass times acceleration
4. For every action, equal and opposite reaction ✓
Action-reaction force pairs act on:
1. The same object
2. Only stationary objects
3. Only moving objects
4. Different objects ✓
Action-reaction forces are:
1. Only equal sometimes
2. Equal in magnitude ✓
3. Unequal in magnitude
4. Never equal
Action-reaction forces are:
1. Same direction
2. Opposite in direction ✓
3. Random directions
4. Perpendicular
Why don't action-reaction forces cancel?
1. They're not equal
2. They're not opposite
3. They act on different objects ✓
4. One happens first
When you walk, you push:
1. Sideways on ground
2. Down on ground only
3. Backward on ground; ground pushes you forward ✓
4. Forward on ground; ground pushes you forward
In swimming, you push:
1. Water backward; water pushes you forward ✓
2. Up only
3. Down only
4. Water forward; water pushes you forward
Rocket propulsion works by:
1. Pushing against ground
2. Expelling gas; gas pushes rocket ✓
3. Pushing against air
4. Magic
Do rockets work in space vacuum?
1. Only near planets
2. Only with special fuel
3. Yes, expel their own mass ✓
4. No, need air to push against
When you sit on chair:
1. No forces act
2. Only you push on chair
3. Only chair pushes on you
4. You push down on chair; chair pushes up on you ✓
Earth pulls you down with your weight. You pull Earth:
1. Up with less force
2. Not at all
3. Up with equal force
4. Down with equal force ✓
Why doesn't Earth move noticeably when you pull it?
1. Gravity only works one way
2. Earth's huge mass means tiny acceleration ✓
3. Earth is fixed in space
4. You don't really pull Earth
Two ice skaters push off each other. Forces are:
1. Greater on lighter skater
2. Equal and opposite ✓
3. Greater on heavier skater
4. Unequal and same direction
If 50 kg skater moves at 2 m/s, 100 kg skater moves at:
1. 2 m/s
2. 1 m/s (opposite direction) ✓
3. 0.5 m/s (same direction)
4. 4 m/s
Horse pulls cart. Cart pulls horse. Why do they move?
1. Cart's force is smaller
2. Horse's force is larger
3. They don't really move
4. Forces act on different objects; not balanced on each ✓
Jumping from boat to dock:
1. Only you move
2. You push boat backward; boat pushes you forward ✓
3. Only boat moves
4. You push boat forward; boat pushes you forward
Recoil of gun when fired:
1. No forces act
2. Gun moves forward
3. Gun stays still
4. Gun pushed backward as bullet goes forward ✓
Why does gun recoil less than bullet speed?
1. Friction stops gun
2. Bullet has more mass ✓
3. Gun is held firmly
4. Gun has more mass
Bird flies by:
1. Wings push air down; air pushes wings up ✓
2. Wings create lift magically
3. Wings push forward only
4. Wings push air up; air pushes wings up
Helicopter hovers when:
1. Pilot wants it to
2. Downward air push equals weight ✓
3. Blades spin fast enough
4. Engine is at certain power
Baseball bat hits ball. Forces on bat and ball are:
1. Zero
2. Greater on ball
3. Greater on bat
4. Equal in magnitude ✓
Why does ball go far but bat doesn't fly back?
1. Ball is lighter
2. Bat is heavier alone explains it
3. Bat held by batter (external force) ✓
4. Force on bat is less
Action-reaction pairs:
1. Action occurs first
2. Reaction occurs first
3. Occur simultaneously ✓
4. Have time delay
Hammer hits nail. Nail hits hammer. Result:
1. Both experience same force ✓
2. Nail experiences more
3. Depends on hammer size
4. Hammer experiences more
Newton's Third Law applies:
1. Only to collisions
2. To all force interactions ✓
3. Only when objects touch
4. Only on Earth
📖 science_quiz4_1_newtons_first_second_laws
What is a force?
1. A speed measurement
2. A push or pull ✓
3. A distance unit
4. A type of energy
What is the SI unit of force?
1. Kilogram (kg)
2. Joule (J)
3. Watt (W)
4. Newton (N) ✓
Newton's First Law is also known as:
1. The Law of Acceleration
2. The Law of Action-Reaction
3. The Law of Inertia ✓
4. The Law of Gravity
An object at rest will:
1. Gradually slow down
2. Stay at rest unless acted on by unbalanced force ✓
3. Accelerate automatically
4. Always start moving eventually
An object in motion will:
1. Gradually slow down and stop
2. Speed up automatically
3. Change direction randomly
4. Continue in straight line at constant speed unless acted upon ✓
What is inertia?
1. The speed of an object
2. The force of gravity
3. The tendency to resist changes in motion ✓
4. The mass of an object squared
Which has more inertia?
1. A tennis ball
2. A feather
3. A bicycle
4. A truck ✓
Balanced forces result in:
1. Acceleration
2. Change in direction
3. No change in motion ✓
4. Deceleration
Unbalanced forces cause:
1. No change
2. Zero velocity
3. Constant velocity
4. Acceleration ✓
Newton's Second Law is expressed as:
1. F = ma ✓
2. F = ½mv²
3. F = mv
4. F = mgh
If mass is constant and force doubles:
1. Acceleration doubles ✓
2. Acceleration stays same
3. Acceleration halves
4. Acceleration quadruples
If force is constant and mass doubles:
1. Acceleration halves
2. Acceleration stays same
3. Acceleration doubles ✓
4. Acceleration quadruples
What force is needed to accelerate 10 kg at 5 m/s²?
1. 50 N ✓
2. 5 N
3. 15 N
4. 2 N
A 20 N force acts on 4 kg mass. Acceleration is:
1. 24 m/s²
2. 80 m/s²
3. 16 m/s²
4. 5 m/s² ✓
An object accelerates at 8 m/s² with 40 N force. Its mass is:
1. 48 kg
2. 5 kg ✓
3. 320 kg
4. 32 kg
Net force is:
1. Always zero
2. Always positive
3. Largest force only
4. Vector sum of all forces ✓
Two forces (10 N right, 3 N left) on object. Net force is:
1. 7 N right ✓
2. 7 N left
3. 13 N left
4. 13 N right
When you're in a car that suddenly brakes, you lurch forward because:
1. A forward force pushes you
2. Gravity pulls you forward
3. Your inertia keeps you moving ✓
4. The car pushes you
A hockey puck on frictionless ice:
1. Changes direction randomly
2. Moves forever at constant speed ✓
3. Gradually slows and stops
4. Speeds up
One Newton equals:
1. 1 kg·m/s² ✓
2. 1 kg/s
3. 1 kg·m
4. 1 m/s²
The more mass an object has:
1. The more inertia it has ✓
2. The smaller it is
3. The less inertia it has
4. The faster it moves
If net force is zero, the object:
1. Must be moving only
2. Has constant velocity or is at rest ✓
3. Must be accelerating
4. Must be at rest only
Why do astronauts float in space?
1. They have no mass
2. There's no gravity in space
3. They have no weight or mass
4. They're in continuous free fall (orbit) ✓
A tablecloth is pulled quickly from under dishes. Dishes stay because:
1. Inertia resists sudden change ✓
2. They're glued down
3. Magic
4. Friction is very high
Newton's First and Second Laws apply:
1. To all objects everywhere ✓
2. Only in laboratories
3. Only on Earth
4. Only to large objects
📖 science_quiz3_8_energy_sustainability
What is sustainability?
1. Meeting today's needs without harming future ✓
2. Never using energy
3. Only environmental protection
4. Using all resources now
Three pillars of sustainability:
1. Only environmental
2. Only social
3. Environmental, Social, Economic ✓
4. Only economic
Greenhouse effect is:
1. Only caused by humans
2. Natural process keeping Earth warm ✓
3. Always bad
4. Cooling effect
Main greenhouse gas from energy:
1. Helium
2. Oxygen
3. Nitrogen
4. Carbon dioxide (CO₂) ✓
Energy sector causes what % of emissions?
1. About 75% ✓
2. About 1%
3. About 10%
4. 0%
What is carbon footprint?
1. Amount of carbon eaten
2. Total greenhouse gas emissions caused ✓
3. Carbon in atmosphere
4. Size of feet
Average sustainable carbon footprint target:
1. ~2 tons CO₂/year per person ✓
2. 0.1 tons/year
3. Unlimited
4. 100 tons/year
Energy efficiency means:
1. Using more energy
2. Using less energy for same result ✓
3. Using energy faster
4. Not using energy
Energy conservation means:
1. Destroying energy
2. Using energy less often ✓
3. Creating energy
4. Always using energy
LED bulbs vs incandescent:
1. LEDs 80-90% efficient vs 5% ✓
2. Incandescent better
3. Both equal
4. LEDs less efficient
Best way to reduce home heating energy:
1. Better insulation ✓
2. Remove insulation
3. Use more heaters
4. Open windows
Phantom power refers to:
1. Ghost energy
2. Invisible electricity
3. Devices using energy when 'off' ✓
4. Free energy
Transportation accounts for what % of emissions?
1. ~1%
2. ~50%
3. ~23% ✓
4. ~90%
Electric vehicles are better because:
1. Produce no emissions ever
2. Never need charging
3. Higher efficiency, can use renewable electricity ✓
4. Unlimited range
Paris Agreement goal:
1. Stop all energy use
2. Increase fossil fuels
3. Cool Earth by 5°C
4. Limit warming to 1.5-2°C ✓
What is net zero?
1. Zero economy
2. Zero energy use
3. Zero population
4. Emissions produced = emissions removed ✓
Current global warming:
1. No warming
2. ~1.2°C above pre-industrial ✓
3. ~0.1°C
4. ~10°C
Most effective individual action:
1. Only use paper bags instead of plastic
2. Only recycle materials
3. Reduce car use, improve home energy efficiency, and eat less meat ✓
4. Do nothing and take no action
Renewable energy costs:
1. Always increasing
2. Staying the same
3. Decreasing rapidly ✓
4. More expensive than fossil fuels
Carbon capture and storage (CCS):
1. Releases more CO₂
2. Creates new carbon
3. Captures other gases
4. Captures CO₂ from power plants ✓
Circular economy means:
1. Linear take-make-waste
2. Buying more
3. Reduce, reuse, recycle resources ✓
4. Only throwing away
Energy payback time:
1. Lifetime of device
2. Warranty period
3. Time to pay electricity bill
4. How long to generate energy used in production ✓
Why transition to renewables matters:
1. Climate crisis, air quality, sustainability ✓
2. Use more energy
3. Increase emissions
4. Make energy expensive
Biggest challenge for renewables:
1. Renewable energy is too inexpensive
2. Renewable energy is too readily available
3. Energy storage for intermittent energy sources ✓
4. Renewable energy produces too much power
What gives hope for energy future?
1. Fossil fuels increasing
2. No solutions exist
3. Nothing is changing
4. Technology improving, costs decreasing, awareness growing ✓
📖 science_quiz3_7_fossil_fuels
What are fossil fuels?
1. Solar and wind
2. Coal, oil, and natural gas ✓
3. Nuclear and hydro
4. Geothermal and tidal
Fossil fuels formed from:
1. Water and air
2. Ancient plants and organisms ✓
3. Rocks and minerals
4. Current plants
How long does it take to form fossil fuels?
1. Days
2. Millions of years ✓
3. Months
4. Years
Why are fossil fuels non-renewable?
1. Are being created daily
2. Are infinite
3. Take millions of years to form ✓
4. Never run out
Coal is primarily made of:
1. Oxygen
2. Hydrogen
3. Nitrogen
4. Carbon ✓
Anthracite coal has:
1. Lowest carbon content
2. No carbon
3. Highest carbon content, highest energy ✓
4. Only hydrogen
Oil (petroleum) formed from:
1. Dinosaurs only
2. Modern algae
3. Coal compression
4. Ancient marine organisms ✓
Oil refining separates crude oil into:
1. Compounds by color
2. Different products by boiling point ✓
3. Molecules by size only
4. Elements by weight
Natural gas is primarily:
1. Nitrogen
2. Methane (CH₄) ✓
3. Carbon dioxide
4. Oxygen
Fracking is:
1. Finding oil on surface
2. Cleaning natural gas
3. Fracturing rock to release trapped gas ✓
4. Making synthetic fuel
Main advantage of fossil fuels:
1. High energy density, convenient ✓
2. Never run out
3. No infrastructure needed
4. Completely clean
Main disadvantage of fossil fuels:
1. Produce CO₂ causing climate change ✓
2. Cold when burned
3. Too abundant
4. Renewable
Coal is most used for:
1. Transportation
2. Electricity generation ✓
3. Making plastic
4. Cooking only
Oil is most used for:
1. Transportation fuels ✓
2. Heating homes only
3. Electricity only
4. Agriculture only
Natural gas is cleanest fossil fuel because:
1. Produces no CO₂
2. Has no carbon
3. Is actually renewable
4. Produces ~50% less CO₂ than coal ✓
Estimated fossil fuel reserves:
1. Millions of years
2. Unlimited
3. Already depleted
4. 50-150 years at current rate ✓
What is nuclear energy?
1. Energy from fossils
2. Energy from chemicals
3. Energy from burning uranium
4. Energy from splitting atoms ✓
Nuclear energy advantage:
1. No CO₂ emissions, very energy-dense ✓
2. No waste produced
3. Completely safe
4. Uses renewable fuel
Nuclear energy disadvantage:
1. Radioactive waste, safety concerns ✓
2. Low efficiency
3. Renewable fuel
4. High CO₂ emissions
Major nuclear accidents include:
1. No accidents have ever occurred
2. Chernobyl and Fukushima are examples of major accidents ✓
3. Only minor incidents with no significant impact
4. Hundreds of accidents occur every year
Nuclear fusion (sun's energy):
1. Not yet practical for power plants ✓
2. Same as fission
3. Uses coal
4. Widely used today
Acid rain is caused by:
1. Pure water
2. SO₂ and NOₓ from burning fossil fuels ✓
3. Nuclear energy
4. Renewable energy
Ocean acidification caused by:
1. CO₂ absorbed from atmosphere ✓
2. Too much salt
3. Marine life
4. Natural processes only
Peak oil means:
1. Maximum oil production rate has passed ✓
2. Oil is unlimited
3. Oil is most expensive
4. Oil is at highest quality
Bridge fuel refers to:
1. Nuclear only
2. Renewable energy
3. Natural gas (cleaner than coal, not renewable) ✓
4. Coal power
📖 science_quiz3_6_renewable_energy
What is renewable energy?
1. Energy that lasts forever
2. Energy from fossil fuels
3. Energy from nuclear
4. Energy from naturally replenished sources ✓
Which is renewable energy?
1. Coal, oil, gas
2. Solar, wind, hydro ✓
3. All fossil fuels
4. Uranium
How do solar panels work?
1. Store sunlight
2. Convert sunlight to electricity ✓
3. Reflect sunlight
4. Burn sunlight
Solar panel efficiency is typically:
1. 80-90%
2. 100%
3. 15-20% ✓
4. 5%
Advantage of solar energy:
1. Works at night
2. Clean, no emissions, unlimited ✓
3. Small scale only
4. Very cheap initially
Disadvantage of solar energy:
1. Causes pollution
2. Intermittent (doesn't work at night) ✓
3. Heats the planet
4. Very loud
Wind turbines generate electricity by:
1. Converting kinetic energy of wind ✓
2. Stopping wind
3. Burning wind
4. Creating wind
Wind energy advantage:
1. Silent operation
2. Clean, renewable, land can be used below ✓
3. Works without wind
4. Cheap to build
Wind energy disadvantage:
1. Intermittent, location-specific, can harm birds ✓
2. Causes earthquakes
3. Produces CO₂
4. Uses too much water
Hydroelectric power uses:
1. Thermal energy of water
2. Nuclear energy
3. Potential energy of water at height ✓
4. Chemical energy in water
Hydroelectric power advantage:
1. Reliable, very efficient (~90%) ✓
2. Very small scale
3. No environmental impact
4. Works without water
Hydroelectric power disadvantage:
1. Very inefficient
2. Can disrupt ecosystems, location-specific ✓
3. Causes air pollution
4. Produces CO₂
Geothermal energy uses:
1. Heat from friction
2. Heat from sun
3. Heat from Earth's interior ✓
4. Heat from combustion
Geothermal advantage:
1. No drilling needed
2. Very cheap
3. 24/7 reliable, small footprint ✓
4. Available everywhere
Geothermal disadvantage:
1. Location-specific (near tectonic boundaries) ✓
2. Cools the Earth
3. Produces lots of CO₂
4. Very loud
Biomass energy comes from:
1. Synthetic materials
2. Organic matter (plants, waste) ✓
3. Rocks and minerals
4. Metal ores
Biomass is considered renewable because:
1. It's very efficient
2. Plants regrow and absorb CO₂ ✓
3. It's free
4. It never runs out
Biomass disadvantage:
1. Can compete with food production ✓
2. 100% efficient
3. Completely clean
4. Works anywhere
Tidal energy uses:
1. Ocean temperature
2. Movement of ocean tides ✓
3. Ocean color
4. Salt in seawater
Tidal energy advantage:
1. Very cheap
2. Very predictable ✓
3. Available everywhere
4. No environmental impact
Which renewable has highest capacity factor?
1. Solar energy with a relatively low capacity factor
2. Tidal energy with a moderate capacity factor
3. Wind energy with a moderate capacity factor
4. Geothermal energy with a very high capacity factor ✓
Why is energy storage important for renewables?
1. To make renewable energy more expensive
2. To destroy excess energy that is produced
3. Solar and wind energy sources are intermittent ✓
4. To create more energy than is available
Pumped hydro storage:
1. Creates new water
2. Uses chemical reactions
3. Pumps water uphill to store energy ✓
4. Destroys energy
Iceland gets most energy from:
1. Geothermal energy, which is abundant in Iceland ✓
2. Nuclear power plants
3. Oil and petroleum products
4. Coal-fired power plants
Best renewable energy solution:
1. Mix of different sources ✓
2. Only one type
3. All wind
4. All solar
📖 science_quiz3_5_conservation_of_energy
The law of conservation of energy states:
1. Energy cannot be created or destroyed ✓
2. Energy can be destroyed
3. Energy always increases
4. Energy can be created
What is an isolated system?
1. Energy freely flows
2. No energy enters or leaves ✓
3. Only energy enters
4. Only energy leaves
Total energy in isolated system:
1. Remains constant ✓
2. Always increases
3. Always decreases
4. Varies randomly
In a pendulum (no friction), total mechanical energy:
1. Decreases
2. Stays constant ✓
3. Becomes zero
4. Increases
At top of pendulum swing:
1. Maximum PE, zero KE ✓
2. Equal PE and KE
3. Maximum KE, zero PE
4. Both zero
At bottom of pendulum swing:
1. Maximum PE, zero KE
2. Equal PE and KE
3. Both zero
4. Maximum KE, minimum PE ✓
A ball dropped from 10 m. Just before ground:
1. Only PE exists
2. Energy disappears
3. Energy is destroyed
4. All PE converted to KE ✓
Where does 'lost' energy go?
1. Transforms to heat/sound (not truly lost) ✓
2. Is actually destroyed
3. Returns to source
4. Disappears into space
Bouncing ball loses height because:
1. Energy converts to heat and sound ✓
2. Ball loses mass
3. Gravity gets stronger
4. Energy is destroyed
Friction seems to 'destroy' mechanical energy, but:
1. Actually destroys it
2. Stores it forever
3. Converts it to thermal energy ✓
4. Reverses time
Why do roller coasters need first hill highest?
1. To go faster
2. For safety
3. For fun
4. Energy conserved; can't gain more energy ✓
Perpetual motion machine is impossible because:
1. Not enough materials
2. Energy is always lost to heat/friction ✓
3. Not invented yet
4. Gravity prevents it
If you lift 2 kg to 5 m, then drop it. Final KE equals:
1. Less than initial PE always
2. Initial PE (if no air resistance) ✓
3. Zero
4. More than initial PE
System with friction:
1. Total energy conserved (includes heat) ✓
2. Energy is destroyed
3. Energy disappears
4. Energy multiplies
In car braking, kinetic energy becomes:
1. Thermal energy in brakes ✓
2. Chemical energy
3. Nuclear energy
4. Light energy
Spring compressed then released. Energy transformations:
1. Elastic PE → KE → Other forms ✓
2. KE → Chemical
3. Nuclear → Thermal
4. Light → Sound
A 1000 kg car at 20 m/s brakes to stop. KE becomes:
1. Becomes PE
2. Stays as KE
3. 200,000 J of thermal energy ✓
4. Is destroyed
Why can't we collect all 'wasted' energy?
1. It's destroyed
2. It spreads out and becomes unusable (entropy) ✓
3. It goes to space
4. It's invisible
E = mc² shows:
1. Mass can convert to energy ✓
2. Energy = motion × speed
3. Energy = mass × charge
4. Energy = momentum × mass
Nuclear reactions release energy by:
1. Destroying energy
2. Converting small amount of mass to energy ✓
3. Chemical reactions
4. Creating energy from nothing
Hydroelectric dam stores energy as:
1. Nuclear energy
2. Gravitational PE ✓
3. Kinetic energy
4. Chemical energy
Pumped-storage hydroelectricity:
1. Destroys energy
2. Uses fusion
3. Creates new energy
4. Stores energy by pumping water uphill ✓
If total energy is conserved, why energy crisis?
1. Useful energy becomes less useful (entropy) ✓
2. Energy leaves Earth
3. Not enough energy exists
4. Energy is destroyed
Regenerative braking in electric cars:
1. Converts KE back to electrical energy ✓
2. Creates new energy
3. Destroys kinetic energy
4. Uses only friction
Conservation of energy applies:
1. Everywhere in the universe ✓
2. Only to large objects
3. Only in laboratories
4. Only on Earth
📖 science_quiz3_4_work_power_machines
What is work in physics?
1. Any physical activity
2. Force applied over a distance ✓
3. Energy stored in object
4. Power multiplied by time
Work formula is:
1. W = P × t
2. W = m × a
3. W = ½mv²
4. W = F × d ✓
SI unit of work is:
1. Pascal (Pa)
2. Joule (J) ✓
3. Watt (W)
4. Newton (N)
Is work done when carrying a box horizontally?
1. No, force perpendicular to motion ✓
2. Yes, you're carrying weight
3. Yes, box is heavy
4. Yes, you're tired
What is power?
1. Distance per time
2. Total energy
3. Amount of force
4. Rate of doing work ✓
Power formula is:
1. P = F × d
2. P = m × a
3. P = ½mv²
4. P = W / t ✓
SI unit of power is:
1. Watt (W) ✓
2. Meter (m)
3. Newton (N)
4. Joule (J)
One watt equals:
1. One meter per second
2. One joule per second ✓
3. One kilogram meter
4. One newton per meter
Two people lift same box to same height. One does it faster. Who has more power?
1. The faster person ✓
2. The slower person
3. Neither has power
4. Both have same power
What is a simple machine?
1. Device that destroys friction
2. Device that makes work easier ✓
3. Device that reduces work
4. Device that creates energy
Simple machines reduce total work needed. True or false?
1. True - energy is saved
2. False - work increases
3. False - work stays the same ✓
4. True - work is reduced
What is mechanical advantage (MA)?
1. Distance / Force
2. Output force / Input force ✓
3. Input force / Output force
4. Work / Time
If MA = 4, what does it mean?
1. Output force is 4× input force ✓
2. 4 joules of work
3. Input force is 4× output
4. 4 machines needed
Trade-off in simple machines:
1. More speed means less work
2. Less distance gives more force
3. Less force requires more distance ✓
4. More force requires less energy
Name the six simple machines:
1. None of these options are correct
2. Lever, wheel and axle, pulley, inclined plane, wedge, and screw ✓
3. Car, bike, train, plane, boat, and rocket
4. Hammer, saw, drill, lathe, press, and jack
A lever has three parts:
1. Handle, pivot, base
2. Motor, gear, shaft
3. Fulcrum, effort, load ✓
4. Spring, force, mass
In a Class 1 lever:
1. Load is in the middle
2. Effort is in the middle
3. Fulcrum is in the middle ✓
4. All are same point
Wheelbarrow is which class lever?
1. Class 2 (load in middle) ✓
2. Class 3 (effort in middle)
3. Not a lever
4. Class 1 (fulcrum in middle)
A fixed pulley provides:
1. MA = 4
2. MA = 2
3. MA = 1 (changes direction only) ✓
4. MA = 0
Movable pulley provides:
1. MA = 4
2. MA = 0
3. MA = 2 ✓
4. MA = 1
Inclined plane MA formula:
1. Height / Length
2. Mass × gravity
3. Force / Distance
4. Length of ramp / Height ✓
Wedge is made of:
1. One screw
2. One pulley
3. Two inclined planes back-to-back ✓
4. One lever
Screw is:
1. Rotating wedge
2. Inclined plane wrapped around cylinder ✓
3. Spinning pulley
4. Lever in circle
If you push 100 N with MA = 5, output force is:
1. 20 N
2. 5 N
3. 500 N ✓
4. 100 N
Why are machines less than 100% efficient?
1. Work is lost
2. Friction converts energy to heat ✓
3. Machines create energy
4. Energy is destroyed
📖 science_quiz3_3_heat_transfer
What is the difference between heat and temperature?
1. Heat is always higher
2. Heat is energy transfer; temperature is average KE ✓
3. They are the same thing
4. Temperature transfers energy
Heat always flows from:
1. Cold to hot
2. High to low density
3. Hot to cold ✓
4. Low to high pressure
What is thermal equilibrium?
1. When two objects reach same temperature ✓
2. When temperature is zero
3. When heat stops existing
4. When cold wins over hot
What is conduction?
1. Heat transfer through light
2. Heat transfer through fluid motion
3. Heat transfer through empty space
4. Heat transfer through direct contact ✓
Which material is the best conductor?
1. Air
2. Plastic
3. Wood
4. Silver ✓
Which material is the best insulator?
1. Air ✓
2. Copper
3. Aluminum
4. Steel
What is convection?
1. Heat transfer through solid contact
2. Heat transfer through sound
3. Heat transfer through radiation
4. Heat transfer through fluid movement ✓
In convection, warm fluid:
1. Moves randomly
2. Rises because it's less dense ✓
3. Stays in place
4. Sinks because it's heavier
What is radiation?
1. Heat transfer through touching
2. Heat transfer through electromagnetic waves ✓
3. Heat transfer through sound
4. Heat transfer through water
Which heat transfer method works in vacuum?
1. Radiation only ✓
2. Convection only
3. Conduction only
4. All three methods
The sun heats Earth through:
1. Convection
2. All three
3. Radiation ✓
4. Conduction
Metal feels colder than wood at same temperature because:
1. Metal contains ice
2. Wood has higher temperature
3. Metal conducts heat away faster ✓
4. Metal is actually colder
Boiling water shows heat transfer by:
1. Reflection
2. Convection ✓
3. Conduction
4. Radiation
A thermos flask reduces heat transfer by:
1. Using solid metal walls
2. Eliminating conduction and convection ✓
3. Allowing air circulation
4. Increasing thermal conductivity
Dark colors absorb radiation:
1. Better than light colors ✓
2. Not at all
3. Worse than light colors
4. Same as light colors
Why do hot air balloons rise?
1. Hot air is magnetic
2. Hot air is compressed
3. Hot air weighs more
4. Hot air is less dense (convection) ✓
Sea breeze during day occurs because:
1. Ocean is always cold throughout the day
2. Gravity pulls air downward
3. Wind comes from outer space
4. Land heats faster than water, causing air to rise through convection ✓
Which has highest thermal conductivity?
1. Wood
2. Copper ✓
3. Glass
4. Styrofoam
Home insulation works by:
1. Increasing conduction
2. Creating heat
3. Reflecting all radiation
4. Trapping air to prevent convection ✓
Wearing multiple layers in cold keeps you warm by:
1. Creating body heat
2. Trapping air between layers ✓
3. Increasing conduction
4. Blocking all radiation
Which material would you use for pot handles?
1. Metal (conductors)
2. Ice
3. Glass
4. Wood or plastic (insulators) ✓
Infrared cameras detect:
1. Magnetic fields
2. Sound waves
3. Thermal radiation from objects ✓
4. X-rays
Why does a fan help you cool down?
1. Increases convection (air movement) ✓
2. Stops radiation
3. Creates ice
4. Decreases air temperature
Double-pane windows reduce heat loss by:
1. Trapping air between panes ✓
2. Increasing conduction
3. Eliminating glass
4. Using metal frames
At night, Earth cools by:
1. All equally
2. Radiating heat to space ✓
3. Convection in atmosphere
4. Conduction to air
📖 science_quiz3_2_energy_transformations
What is energy transformation?
1. Storing energy forever
2. Creating new energy
3. Destroying old energy
4. Changing energy from one form to another ✓
Energy transformation vs. energy transfer?
1. Transformation = form changes; Transfer = location changes ✓
2. Transfer only in solids
3. Transformation is faster
4. They mean the same thing
In a flashlight: Battery → Light. What transformations?
1. Kinetic energy transforms directly to light
2. Mechanical energy transforms directly to light
3. Chemical energy transforms to electrical energy, then to light and thermal energy ✓
4. Nuclear energy transforms directly to light
Law of conservation of energy states:
1. Energy can be destroyed
2. Energy always increases
3. Energy can be created
4. Energy cannot be created or destroyed ✓
Photosynthesis transforms which energies?
1. Nuclear → Light
2. Kinetic → Chemical
3. Chemical → Light
4. Light → Chemical ✓
When you eat and move, what transformation?
1. Kinetic → Chemical
2. Nuclear → Kinetic
3. Light → Kinetic
4. Chemical → Kinetic + Thermal ✓
Hydroelectric dam: Water → Electricity
1. Nuclear → Electrical
2. Potential → Kinetic → Electrical ✓
3. Thermal → Electrical
4. Chemical → Electrical
What is a Sankey diagram used for?
1. Determining mass
2. Measuring temperature
3. Calculating velocity
4. Showing energy flow and efficiency ✓
If device is 80% efficient, what happens to 20%?
1. Stored in device
2. Becomes useful energy
3. Lost as waste heat ✓
4. Destroyed
Solar panel efficiency is typically:
1. 100%
2. 15-20% ✓
3. 5-10%
4. 80-90%
Car engine is 25% efficient. Where does energy go?
1. 75% in fuel tank
2. 75% is destroyed
3. 75% becomes heat ✓
4. 75% becomes sound only
What is efficiency formula?
1. Force × Distance
2. Useful energy out / Total energy in × 100% ✓
3. Total / Useful
4. Power / Time
Why is no device 100% efficient?
1. Energy is destroyed
2. Not enough technology
3. Friction always causes heat loss ✓
4. Physics prevents it
LED vs incandescent: Which is more efficient?
1. LED bulbs are much more efficient than incandescent bulbs ✓
2. Both are equally efficient
3. Neither produces light at all
4. Incandescent bulbs are more efficient
In a pendulum, energy transforms between:
1. Potential and kinetic ✓
2. Electrical and magnetic
3. Chemical and nuclear
4. Light and sound
Cellular respiration transforms:
1. Light → Chemical
2. Nuclear → Chemical
3. Kinetic → Chemical
4. Chemical (glucose) → ATP + Thermal ✓
Input 500 J, output 400 J, efficiency is:
1. 20%
2. 100%
3. 80% ✓
4. 125%
Energy chains show:
1. Energy being created
2. Only one transformation
3. Energy being destroyed
4. Multiple transformations in sequence ✓
Coal power plant energy chain:
1. Chemical energy transforms directly to electrical energy
2. Chemical energy transforms to thermal, then kinetic, then electrical energy ✓
3. Nuclear energy transforms directly to electrical energy
4. Solar energy transforms directly to electrical energy
What reduces energy efficiency in machines?
1. Perfect surfaces
2. Friction and air resistance ✓
3. Too much input
4. Vacuum conditions
Electric motor 90% efficient, 1000 J input. Output?
1. 500 J each
2. 100 J useful, 900 J heat
3. 900 J useful, 100 J heat ✓
4. 1000 J useful, 0 J heat
Microwave oven transformation:
1. Electrical energy transforms to electromagnetic energy, then to thermal energy ✓
2. Chemical energy transforms directly to thermal energy
3. Kinetic energy transforms directly to thermal energy
4. Nuclear energy transforms directly to thermal energy
Energy 'loss' in transformations means:
1. Converts to less useful forms (heat) ✓
2. Decreases in amount
3. Is actually destroyed
4. Disappears completely
Bouncing ball loses height each bounce because:
1. Energy is destroyed
2. Mass decreases
3. Energy converts to heat and sound ✓
4. Gravity increases
Which has best transformation efficiency?
1. Electric motor (85-90%) ✓
2. Car engine (25%)
3. Human body (20%)
4. Incandescent bulb (5%)
📖 science_quiz3_1_forms_of_energy
What is energy?
1. The ability to do work or cause change ✓
2. The mass of matter
3. The force of gravity
4. The speed of an object
Which type of energy is stored in food?
1. Chemical energy ✓
2. Kinetic energy
3. Sound energy
4. Light energy
A moving car has which type of energy?
1. Nuclear energy
2. Potential energy
3. Kinetic energy ✓
4. Chemical energy
What formula represents kinetic energy?
1. KE = mc²
2. KE = mgh
3. KE = Fd
4. KE = ½mv² ✓
A book on a high shelf has what type of energy?
1. Sound energy
2. Thermal energy
3. Kinetic energy
4. Gravitational potential energy ✓
Which energy form is associated with temperature?
1. Thermal energy ✓
2. Nuclear energy
3. Electrical energy
4. Potential energy
What is the SI unit of energy?
1. Newton (N)
2. Meter (m)
3. Joule (J) ✓
4. Watt (W)
Sunlight is an example of which energy form?
1. Elastic potential energy
2. Chemical energy
3. Kinetic energy
4. Light/radiant energy ✓
A stretched rubber band stores which energy?
1. Chemical energy
2. Elastic potential energy ✓
3. Kinetic energy
4. Nuclear energy
Which has the most kinetic energy?
1. A slow-moving bicycle
2. A parked airplane
3. A fast-moving truck ✓
4. A stationary car
What happens to KE when velocity doubles?
1. It doubles
2. It quadruples ✓
3. It halves
4. It stays the same
Batteries store which form of energy?
1. Chemical energy ✓
2. Sound energy
3. Light energy
4. Kinetic energy
Lightning is an example of which energy?
1. Nuclear energy
2. Electrical energy ✓
3. Mechanical energy
4. Thermal energy
What type of energy does a nuclear power plant use?
1. Solar energy
2. Chemical energy
3. Wind energy
4. Nuclear energy ✓
A vibrating guitar string produces what energy?
1. Nuclear energy
2. Chemical energy
3. Sound energy ✓
4. Gravitational energy
Which object has gravitational potential energy?
1. Wind blowing horizontally
2. A car moving at constant speed
3. A rolling ball on flat ground
4. Water at the top of a waterfall ✓
What energy transformation occurs in a light bulb?
1. Nuclear → Light
2. Kinetic → Light
3. Chemical → Light
4. Electrical → Light + Thermal ✓
A falling apple has which energies?
1. Only kinetic energy
2. Only potential energy
3. Both potential and kinetic ✓
4. Neither type
What is the potential energy formula?
1. PE = mgh ✓
2. PE = Fd
3. PE = ½mv²
4. PE = mc²
Energy can be created or destroyed. True or false?
1. False - energy is conserved ✓
2. True - energy can be destroyed
3. False - energy disappears
4. True - energy can be created
A compressed spring stores what energy?
1. Chemical energy
2. Sound energy
3. Nuclear energy
4. Elastic potential energy ✓
What energy does your body primarily use?
1. Solar energy
2. Chemical energy from food ✓
3. Nuclear energy
4. Electrical energy
A 2 kg ball is 5 m high. What is its PE? (g = 10 m/s²)
1. 200 J
2. 100 J ✓
3. 50 J
4. 10 J
Which has more PE: 1 kg at 10 m or 2 kg at 5 m?
1. 2 kg at 5 m
2. Cannot determine
3. 1 kg at 10 m ✓
4. Both have the same
Can an object have multiple forms of energy simultaneously?
1. Yes, always possible ✓
2. Only in special cases
3. Only two types maximum
4. No, never
📖 science_quiz2_8_conservation_of_mass
Who established the Law of Conservation of Mass?
1. Antoine Lavoisier ✓
2. John Dalton
3. Isaac Newton
4. Albert Einstein
What does the Law of Conservation of Mass state?
1. Mass is neither created nor destroyed ✓
2. Mass can be created
3. Mass always increases
4. Mass always decreases
In a chemical reaction, the total mass of reactants must equal the total mass of:
1. Atoms
2. Products ✓
3. Molecules
4. Electrons
Why is mass conserved in chemical reactions?
1. Atoms are rearranged, not created or destroyed ✓
2. Atoms are multiplied
3. Atoms disappear
4. Atoms change identity
What is a closed system?
1. A system with no reactions
2. A system where no matter enters or leaves ✓
3. A system with gases only
4. A system at low temperature
What is an open system?
1. A system with only liquids
2. A system at high pressure
3. A system where matter can enter or leave ✓
4. A system with no products
If 24 g of magnesium reacts with 16 g of oxygen, what is the mass of magnesium oxide formed?
1. 24 g
2. 40 g ✓
3. 16 g
4. 8 g
When 10 g of calcium carbonate decomposes to 5.6 g of calcium oxide, what mass of CO2 is released?
1. 15.6 g
2. 10 g
3. 5.6 g
4. 4.4 g ✓
Why does mass appear to increase when magnesium burns in air?
1. Light adds mass
2. Magnesium expands
3. Heat adds mass
4. Oxygen from air is incorporated ✓
Why does mass appear to decrease when calcium carbonate is heated in an open container?
1. CO2 gas escapes ✓
2. Calcium evaporates
3. Heat destroys mass
4. Oxygen is absorbed
In a balanced chemical equation, the number of each type of atom on the left must:
1. Be less than the right
2. Be unrelated
3. Be greater than the right
4. Equal the number on the right ✓
If 4 g of hydrogen reacts with 32 g of oxygen to form water, what is the mass of water produced?
1. 28 g
2. 36 g ✓
3. 4 g
4. 32 g
What did Lavoisier use to prove the Law of Conservation of Mass?
1. Sealed containers ✓
2. Open beakers
3. Bunsen burners
4. Test tubes
In the reaction 2H2 + O2 -> 2H2O, how many atoms are there in total before the reaction?
1. 3
2. 5 ✓
3. 4
4. 6
In the reaction 2H2 + O2 -> 2H2O, how many atoms are there in total after the reaction?
1. 4
2. 3
3. 8
4. 6 ✓
When wood burns in an open fire, where does most of the mass go?
1. It disappears
2. Into CO2 and H2O vapor (gases) ✓
3. Into light
4. Into heat
What is the relationship between balanced equations and conservation of mass?
1. Balanced equations violate conservation
2. Balanced equations reflect conservation of mass ✓
3. No relationship
4. They oppose each other
In a truly closed system, can mass change during a chemical reaction?
1. No, mass is conserved ✓
2. Yes, only for gases
3. Yes, always
4. Yes, only for solids
If 100 g of reactants produce 98 g of solid products in an open container, what likely happened?
1. The scale was wrong
2. Mass was destroyed
3. 2 g of gas escaped ✓
4. Mass was converted to energy
Why is conservation of mass important in industrial chemistry?
1. It is not important
2. Only for research
3. To calculate raw materials and products accurately ✓
4. Only for safety
In space missions, why is conservation of mass crucial?
1. It prevents explosions
2. Space has no mass
3. Rockets need extra mass
4. All resources must be accounted for and recycled ✓
In the equation Fe + O2 -> Fe2O3, why must it be balanced?
1. To make it longer
2. To look neat
3. To add complexity
4. To reflect that atoms (and thus mass) are conserved ✓
What happens to the mass of a sealed container when a reaction occurs inside?
1. It increases
2. It stays the same ✓
3. It decreases
4. It doubles
If a candle burns in a sealed jar, what happens to the total mass of the jar and its contents?
1. It decreases
2. It becomes zero
3. It stays the same ✓
4. It increases
Einsteins equation E=mc^2 shows that:
1. Energy is always destroyed
2. Mass and energy are unrelated
3. Mass and energy are related ✓
4. Mass is always created
📖 science_quiz2_7_redox_reactions
What does REDOX stand for?
1. Reactive Oxygen
2. Reduction-Oxidation ✓
3. Red Oxide
4. Reduced Oxygen
What is a half-reaction?
1. Half of a molecule
2. An equation showing only oxidation or only reduction ✓
3. An incomplete reaction
4. A weak reaction
In the half-reaction Zn -> Zn2+ + 2e-, what is happening?
1. Oxidation ✓
2. Reduction
3. Neutralization
4. Decomposition
In the half-reaction Cu2+ + 2e- -> Cu, what is happening?
1. Oxidation
2. Synthesis
3. Reduction ✓
4. Neutralization
In a redox reaction, electrons lost must equal electrons:
1. Gained ✓
2. Created
3. Remaining
4. Destroyed
Which type of reaction is NOT a redox reaction?
1. Combustion
2. Single replacement
3. Combination
4. Double replacement (like neutralization) ✓
In the reaction 2Mg + O2 -> 2MgO, what is oxidized?
1. MgO
2. Magnesium ✓
3. Nothing
4. Oxygen
In photosynthesis, carbon in CO2 is:
1. Unchanged
2. Reduced ✓
3. Neutralized
4. Oxidized
In cellular respiration, glucose is:
1. Unchanged
2. Oxidized ✓
3. Reduced
4. Neutralized
Photosynthesis and cellular respiration are:
1. Opposite reactions ✓
2. Both oxidation only
3. Unrelated
4. The same reaction
In a battery, oxidation occurs at the:
1. Electrolyte
2. Anode ✓
3. Wire
4. Cathode
In a battery, reduction occurs at the:
1. Electrolyte
2. Cathode ✓
3. Wire
4. Anode
Electrolysis uses:
1. Heat energy only
2. No energy
3. Electrical energy to drive chemical reactions ✓
4. Chemical energy to produce electricity
In the extraction of iron (Fe2O3 + 3CO -> 2Fe + 3CO2), what is reduced?
1. Oxygen
2. Carbon
3. CO2
4. Iron ✓
In rusting, iron is:
1. Melted
2. Reduced
3. Oxidized ✓
4. Frozen
Antioxidants work by:
1. Speeding up reactions
2. Adding oxygen
3. Causing oxidation
4. Preventing oxidation ✓
Which is an example of a redox reaction?
1. NaCl + AgNO3 -> AgCl + NaNO3
2. All of the above
3. CH4 + 2O2 -> CO2 + 2H2O ✓
4. HCl + NaOH -> NaCl + H2O
In steel production, carbon acts as a:
1. Neutralizing agent
2. Reducing agent ✓
3. Oxidizing agent
4. Catalyst
Galvanizing prevents rust by:
1. Painting iron
2. Adding oxygen
3. Coating with zinc that oxidizes first ✓
4. Removing all air
Chlorine bleach works by:
1. Oxidizing colored compounds ✓
2. Neutralizing acids
3. Dissolving stains
4. Reducing colored compounds
Free radicals are:
1. Weak acids
2. Highly reactive oxidizing agents ✓
3. Always harmless
4. Only found in plants
Which is a way to prevent food oxidation?
1. Adding water
2. Vacuum packaging ✓
3. Adding oxygen
4. Heating to 100 degrees C continuously
In the nitrogen cycle, conversion of N2 to NH3 is:
1. Neutralization
2. Reduction ✓
3. Combustion
4. Oxidation
Acid rain formation involves:
1. Oxidation of sulfur and nitrogen compounds ✓
2. Only reduction
3. No redox reactions
4. Only neutralization
In electrolysis of water, hydrogen gas is produced by:
1. Combustion
2. Neutralization
3. Oxidation
4. Reduction ✓
📖 science_quiz2_6_oxidation_reduction
What is oxidation in terms of electrons?
1. No change in electrons
2. Loss of electrons ✓
3. Gain of electrons
4. Sharing electrons
What is reduction in terms of electrons?
1. Gain of electrons ✓
2. No change
3. Sharing electrons
4. Loss of electrons
What does OIL RIG stand for?
1. Only Ions Leave, Rest Is Gained
2. Oil In Life, Really Important Gas
3. Oxygen Is Light, Reduction Is Great
4. Oxidation Is Loss, Reduction Is Gain ✓
In the reaction Zn + Cu2+ -> Zn2+ + Cu, what happens to zinc?
1. It is reduced
2. It decomposes
3. It is oxidized ✓
4. It stays the same
In the reaction Zn + Cu2+ -> Zn2+ + Cu, what happens to copper ions?
1. They decompose
2. They are reduced ✓
3. They are oxidized
4. They stay the same
What is an oxidizing agent?
1. A substance that is oxidized
2. A substance that loses oxygen
3. A substance that causes oxidation and is itself reduced ✓
4. A substance that prevents oxidation
What is a reducing agent?
1. A substance that causes reduction and is itself oxidized ✓
2. A substance that gains oxygen
3. A substance that prevents reduction
4. A substance that is reduced
When iron rusts (4Fe + 3O2 -> 2Fe2O3), what happens to iron?
1. It evaporates
2. It is reduced
3. It is oxidized ✓
4. Nothing
Historically, oxidation meant:
1. Losing oxygen
2. Combining with oxygen ✓
3. Gaining electrons
4. Losing hydrogen
What is the oxidation state of a free element like O2 or Fe?
1. +1
2. 0 ✓
3. -2
4. Variable
What is the usual oxidation state of oxygen in compounds?
1. +2
2. 0
3. -1
4. -2 ✓
What is the usual oxidation state of hydrogen in compounds?
1. +1 ✓
2. -1
3. +2
4. 0
In the reaction CuO + H2 -> Cu + H2O, what is reduced?
1. Hydrogen
2. Water
3. Nothing
4. Copper oxide ✓
If oxidation state increases, the substance is:
1. Reduced
2. Oxidized ✓
3. Neutral
4. Decomposed
If oxidation state decreases, the substance is:
1. Neutral
2. Reduced ✓
3. Synthesized
4. Oxidized
Do oxidation and reduction always occur together?
1. Only in acids
2. Yes, they always occur together ✓
3. Only in bases
4. No, they are independent
Cellular respiration involves:
1. Only oxidation
2. Only reduction
3. Both oxidation and reduction ✓
4. Neither process
In batteries, what happens at the anode?
1. Combustion
2. Oxidation ✓
3. Reduction
4. Neutralization
Which is a common oxidizing agent?
1. Oxygen ✓
2. Zinc
3. Hydrogen
4. Carbon
Which is a common reducing agent?
1. Chlorine
2. Hydrogen ✓
3. Oxygen
4. Nitric acid
Galvanizing iron with zinc prevents rust because:
1. Zinc is prettier
2. Zinc prevents oxygen contact
3. Zinc oxidizes first, protecting iron ✓
4. Zinc makes iron harder
Antioxidants in food:
1. Add oxygen
2. Cause reduction
3. Prevent oxidation ✓
4. Speed up oxidation
In photosynthesis, carbon in CO2 is:
1. Neutralized
2. Eliminated
3. Reduced ✓
4. Oxidized
Bleach works by:
1. Reducing stains
2. Oxidizing colored compounds ✓
3. Dissolving dirt
4. Adding color
What is the oxidation state of sulfur in H2SO4?
1. +2
2. +6 ✓
3. -2
4. +4
📖 science_quiz2_5_neutralization
What is a neutralization reaction?
1. Base + Metal -> Salt
2. Acid + Base -> Salt + Water ✓
3. Acid + Metal -> Salt + Hydrogen
4. Acid + Acid -> Salt
What are the two products of a neutralization reaction?
1. Acid and base
2. Metal and salt
3. Gas and water
4. Salt and water ✓
What is the equation for HCl + NaOH?
1. Na2Cl + H2O
2. NaCl + H2O ✓
3. NaH + ClOH
4. NaCl + H2
What is a salt in chemistry?
1. An ionic compound from neutralization ✓
2. Always a liquid
3. A type of acid
4. Only NaCl
Which is a common salt used in food?
1. NaOH
2. CaCO3
3. H2SO4
4. NaCl (sodium chloride) ✓
What salt is formed from H2SO4 + 2NaOH?
1. NaS
2. Na2S
3. Na2SO4 ✓
4. NaSO4
What happens to pH during neutralization of an acid?
1. pH decreases
2. pH goes to 14
3. pH increases toward 7 ✓
4. pH stays at 0
At the equivalence point of a strong acid-strong base titration, what is the pH?
1. 0
2. 14
3. 3
4. 7 ✓
What is titration used for?
1. Determining unknown concentration ✓
2. Measuring temperature
3. Producing water
4. Making salt
Which piece of equipment delivers precise volumes of solution during titration?
1. Pipette only
2. Test tube
3. Beaker
4. Burette ✓
What is the purpose of an indicator in titration?
1. To neutralize the acid
2. To heat the solution
3. To show when neutralization is complete ✓
4. To produce salt
Which indicator is commonly used in strong acid-strong base titrations?
1. Methyl orange
2. Phenolphthalein ✓
3. Universal indicator
4. Litmus
Neutralization reactions are:
1. Neither
2. Endothermic
3. Exothermic ✓
4. Cold
What is the heat of neutralization for H+ + OH- -> H2O?
1. About -100 kJ/mol
2. About +57 kJ/mol
3. 0 kJ/mol
4. About -57 kJ/mol ✓
Antacids work by:
1. Killing bacteria only
2. Neutralizing excess stomach acid ✓
3. Producing more stomach acid
4. Dissolving food
Which is commonly used in antacids?
1. HCl
2. Mg(OH)2 (magnesium hydroxide) ✓
3. H2SO4
4. NaCl
To neutralize acidic soil, farmers add:
1. Lime (CaCO3 or Ca(OH)2) ✓
2. Salt
3. More acid
4. Water only
A bee sting is acidic. What should you apply?
1. Lemon juice (acid)
2. Vinegar (acid)
3. Salt
4. Baking soda (base) ✓
What volume of 0.1 M NaOH is needed to neutralize 20 mL of 0.1 M HCl?
1. 40 mL
2. 10 mL
3. 30 mL
4. 20 mL ✓
In the equation: Acid + Base -> Salt + Water, what type of reaction is this?
1. Decomposition
2. Synthesis
3. Single replacement
4. Double replacement ✓
When HNO3 reacts with KOH, what salt is formed?
1. KNO3 ✓
2. K2NO3
3. KNO2
4. KN
Why should acid be added to water, not water to acid?
1. It is faster
2. It is safer - prevents violent boiling ✓
3. No reason
4. It makes weaker acid
What happens when you mix a strong acid with a strong base?
1. They neutralize forming salt and water ✓
2. They explode
3. Nothing
4. They form a stronger acid
The equivalence point in titration is when:
1. pH is always 7
2. Indicator changes color
3. No more base is needed
4. Acid and base exactly neutralize ✓
What is the purpose of wastewater neutralization?
1. Make it acidic
2. Adjust pH to safe levels before discharge ✓
3. Make it drinkable
4. Remove all chemicals
📖 science_quiz2_4_ph_indicators
What does pH measure?
1. Pressure
2. Temperature
3. Volume
4. Hydrogen ion concentration ✓
What is the pH range of the common pH scale?
1. 0 to 10
2. 0 to 7
3. 1 to 14
4. 0 to 14 ✓
What is the pH of a neutral solution at 25 degrees C?
1. 0
2. 7 ✓
3. 14
4. 10
Solutions with pH less than 7 are:
1. Neutral
2. Acidic ✓
3. Basic
4. Alkaline
Solutions with pH greater than 7 are:
1. Basic ✓
2. Neutral
3. Acidic
4. Neutral or acidic
If pH decreases by 1 unit, the H+ concentration:
1. Increases 10 times ✓
2. Decreases 10 times
3. Stays the same
4. Decreases 2 times
How many times more acidic is pH 2 compared to pH 4?
1. 4 times
2. 10 times
3. 2 times
4. 100 times ✓
What is the approximate pH of lemon juice?
1. 14
2. 2 ✓
3. 10
4. 7
What is the approximate pH of bleach?
1. 12 ✓
2. 0
3. 7
4. 2
What equation relates pH and pOH at 25 degrees C?
1. pH x pOH = 14
2. pH - pOH = 14
3. pH + pOH = 7
4. pH + pOH = 14 ✓
If pH is 3, what is pOH?
1. 7
2. 3
3. 14
4. 11 ✓
What are indicators?
1. Neutral compounds
2. Substances that change color at different pH ✓
3. Always colorless
4. Strong acids
What color does blue litmus paper turn in acid?
1. Yellow
2. Red ✓
3. Blue
4. Green
What color does red litmus paper turn in base?
1. Green
2. Blue ✓
3. Yellow
4. Red
What color is phenolphthalein in acidic solution?
1. Blue
2. Yellow
3. Pink
4. Colorless ✓
What color is phenolphthalein in basic solution?
1. Blue
2. Pink ✓
3. Colorless
4. Yellow
What color is methyl orange in acidic solution?
1. Red ✓
2. Yellow
3. Blue
4. Green
What is special about universal indicator?
1. It never changes color
2. It shows many different colors for different pH values ✓
3. It is always red
4. It only works in acids
What tool gives the most accurate pH measurement?
1. Universal indicator
2. Phenolphthalein
3. pH meter ✓
4. Litmus paper
What is the normal pH range of human blood?
1. 7.35 - 7.45 ✓
2. 8.0 - 8.5
3. 6.0 - 6.5
4. 7.0 exactly
What is the approximate pH of stomach acid?
1. 5.0 - 6.0
2. 7.0
3. 9.0 - 10.0
4. 1.5 - 3.5 ✓
Acid rain has a pH:
1. Greater than 7
2. Always 10
3. Less than 5 ✓
4. Equal to 7
What are buffers?
1. Solutions that always have pH 7
2. Solutions that resist pH changes ✓
3. Weak bases only
4. Strong acids only
The ideal pH range for swimming pools is:
1. 1 - 2
2. 4 - 5
3. 7.2 - 7.8 ✓
4. 12 - 14
What happens to pH as you dilute an acidic solution with water?
1. pH decreases
2. pH stays the same
3. pH becomes 14
4. pH increases toward 7 ✓
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