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| ID | 과목 | 파일명 | 문제 수 | 퀴즈 타입 | 소유자 | 통계 조회/가져오기 |
등록일 | 작업 |
|---|---|---|---|---|---|---|---|---|
| 691 | 🔬 Science |
science_quiz7_3_energy_flow
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 690 | 🔬 Science |
science_quiz7_2_food_chains_webs
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 689 | 🔬 Science |
science_quiz7_1_introduction_ecosystems
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
|
| 688 | 🔬 Science |
science_quiz6_8_health_disease
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
|
| 687 | 🔬 Science |
science_quiz6_7_human_body_systems
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
|
| 686 | 🔬 Science |
science_quiz6_6_dna_genes_heredity
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
|
| 685 | 🔬 Science |
science_quiz6_5_cell_division
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
|
| 684 | 🔬 Science |
science_quiz6_4_cellular_respiration
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 683 | 🔬 Science |
science_quiz6_3_photosynthesis
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 682 | 🔬 Science |
science_quiz6_2_cell_processes_transport
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 681 | 🔬 Science |
science_quiz6_1_cell_structure
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 680 | 🔬 Science |
science_quiz5_8_waves
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
|
| 679 | 🔬 Science |
science_quiz5_7_electromagnetic_induction
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:41 |
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| 678 | 🔬 Science |
science_quiz5_6_electromagnets_motors
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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| 677 | 🔬 Science |
science_quiz5_5_magnetism
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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| 676 | 🔬 Science |
science_quiz5_4_series_parallel_circuits
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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| 675 | 🔬 Science |
science_quiz5_3_ohms_law_circuits
|
25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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| 674 | 🔬 Science |
science_quiz5_2_current_voltage_resistance
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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| 673 | 🔬 Science |
science_quiz5_1_static_electricity
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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| 672 | 🔬 Science |
science_quiz4_8_forces_real_world
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25문제 | 🛡️ 교강사 | admin | 👁️ 0 / 📥 0 | 2026-03-11 15:14:40 |
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📖 science_quiz7_3_energy_flow
Primary productivity refers to:
1. Rate producers convert light to chemical energy ✓
2. Rate at which decomposers work
3. Rate consumers eat producers
4. Rate at which predators hunt
Net primary productivity (NPP) is:
1. GPP minus respiration by producers ✓
2. All energy captured by photosynthesis
3. Energy used by consumers
4. Total decomposer activity
The 10% rule states that:
1. 10% of organisms survive each year
2. Food chains always have 10 levels
3. 10% of sunlight is captured by plants
4. About 10% of energy transfers between trophic levels ✓
Why is only about 1% of sunlight captured by producers?
1. Plants are inherently inefficient
2. Too much oxygen in the atmosphere
3. Wrong wavelengths, structural limits, missed surfaces ✓
4. Not enough CO₂ in the atmosphere
Energy pyramids are always pyramid-shaped because:
1. There are more species at the bottom
2. Energy decreases at each level due to energy loss ✓
3. Producers are bigger
4. Consumers are smaller
Unlike matter, energy in ecosystems:
1. Stays constant at each level
2. Cycles infinitely like nutrients
3. Increases at each trophic level
4. Flows one direction and is lost as heat ✓
Which ecosystem has the highest net primary productivity?
1. Desert biome
2. Tundra biome
3. Open ocean biome
4. Tropical rainforest ✓
If producers have 100,000 kcal, approximately how much energy reaches tertiary consumers?
1. 100,000 kcal
2. 100 kcal ✓
3. 1,000 kcal
4. 10,000 kcal
Trophic efficiency is:
1. Always exactly 50% between trophic levels
2. 100% efficient in all ecosystems studied
3. Percent of energy transferred between levels (~10%) ✓
4. Not measurable in any ecosystem studied
Most energy is lost between trophic levels as:
1. Light energy
2. Heat from metabolism ✓
3. Sound energy
4. Electrical energy
Why can ecosystems support fewer tertiary consumers than producers?
1. Tertiary consumers are pickier eaters
2. Much less energy available at higher levels ✓
3. They need less food to survive
4. They are physically smaller
Biomass pyramids can be inverted in aquatic ecosystems because:
1. Fish are heavier than algae in the water
2. There is more water available for growth
3. Phytoplankton reproduce fast; low biomass supports larger consumers ✓
4. Decomposers are very abundant in water
What happens to energy that doesn't transfer to the next trophic level?
1. It's stored forever in organisms
2. Lost as heat, waste, and metabolism ✓
3. Converted to matter permanently
4. Goes back to the sun eventually
Eating lower on the food chain (e.g., plants instead of meat) is more efficient because:
1. Plants taste better than meat
2. Plants have more total energy
3. Less energy lost through fewer trophic transfers ✓
4. Animals are harder to catch and eat
Gross primary productivity (GPP) includes:
1. Energy from consumers only
2. All energy captured by photosynthesis before plant use ✓
3. Energy stored in decomposers
4. Only energy available to consumers
Which statement about energy in ecosystems is FALSE?
1. Energy flows in one direction
2. 10% typically transfers between levels
3. Energy can be recycled like nutrients ✓
4. The sun is the ultimate source
Why are food chains limited to about 4-5 trophic levels?
1. Insufficient energy after multiple 10% transfers ✓
2. Animals get too large at top levels
3. Not enough physical space for them
4. Too much competition at top levels
Primary productivity is highest in ecosystems with:
1. Low temperature and low water availability
2. Only abundant sunlight available
3. High sunlight, water, warmth, and nutrients ✓
4. No nutrients available in the soil
The total amount of living tissue at each trophic level is called:
1. Biomass ✓
2. Energy
3. Population
4. Productivity
Cold-blooded animals have higher trophic efficiency than warm-blooded because:
1. They eat more food overall than warm-blooded
2. They are strict carnivores with efficient digestion
3. They don't spend energy maintaining body temperature ✓
4. They are larger in body size than warm-blooded
In the energy pyramid, the largest amount of energy is found in:
1. Tertiary consumers
2. Producers ✓
3. Primary consumers
4. Secondary consumers
What would happen if all producers suddenly disappeared?
1. Consumers would eat each other indefinitely
2. The entire ecosystem would collapse within a short time ✓
3. Only herbivores affected
4. Decomposers would take over
Global net primary productivity is approximately evenly split between:
1. Forests and grasslands
2. Cities and farms
3. Deserts and tundra
4. Oceans and land ✓
The 10% rule explains why:
1. Producers need consumers
2. All animals are the same size
3. Energy increases up the food chain
4. There are fewer lions than zebras ✓
Which factor does NOT affect primary productivity?
1. Nutrient availability
2. Number of predators ✓
3. Water availability
4. Sunlight availability
📖 science_quiz7_2_food_chains_webs
In a food chain, energy flows from:
1. Consumers to producers
2. Decomposers to producers only
3. Producers to consumers ✓
4. Predators to prey
What is the role of decomposers in an ecosystem?
1. Break down dead organisms, return nutrients ✓
2. Hunt and consume living prey animals
3. Produce energy from sunlight directly
4. Eat only living plant material for food
Which organism is a primary consumer?
1. Grass
2. Hawk eating snake
3. Snake eating frog
4. Grasshopper eating grass ✓
What does the arrow represent in a food chain: Grass → Rabbit → Fox?
1. Direction predator moves toward prey
2. Direction of energy flow (food to consumer) ✓
3. Physical location of organisms
4. Direction nutrients move in soil
According to the 10% rule:
1. Energy increases at each trophic level
2. 100% of energy transfers between levels
3. No energy is lost between levels
4. About 10% of energy transfers between trophic levels ✓
Which is an apex predator?
1. Grasshopper (herbivore)
2. Rabbit (herbivore)
3. Algae (producer)
4. Lion (no natural predators) ✓
A food web is more realistic than a food chain because:
1. It is simpler to understand
2. It shows only one feeding path
3. It ignores decomposers entirely
4. It shows interconnected feeding relationships ✓
What is a trophic level?
1. A type of habitat in an ecosystem
2. A feeding position in a food chain ✓
3. A specific geographic location
4. A type of organism in a community
Why are food chains rarely longer than 4-5 levels?
1. There's too much energy at the top
2. Not enough energy remains at higher levels ✓
3. Producers can't support more consumers
4. Animals become too large to sustain
An omnivore is an organism that:
1. Eats only dead matter
2. Eats both plants and animals ✓
3. Eats only meat
4. Eats only plants
In the food chain: Oak tree → Caterpillar → Bird → Cat, which is the secondary consumer?
1. Bird ✓
2. Caterpillar
3. Cat
4. Oak tree
What shape does a biomass pyramid typically have?
1. Inverted triangle (wide top)
2. Rectangle shape
3. Pyramid (wide base, narrow top) ✓
4. Circle shape
Which organism occupies the first trophic level?
1. Carnivore
2. Decomposer
3. Herbivore
4. Producer (plant) ✓
A keystone species removal can cause:
1. Improved ecosystem health
2. Only plant species to be affected
3. Trophic cascade with effects across the food web ✓
4. No change to the ecosystem
Parasites differ from predators because:
1. They are larger than their host
2. They are decomposers
3. They usually don't immediately kill their host ✓
4. They only eat plants
In an ocean food web, phytoplankton are:
1. Decomposers
2. Consumers
3. Producers ✓
4. Apex predators
If 10,000 kcal of energy is available at the producer level, approximately how much reaches the secondary consumer level?
1. 10,000 kcal
2. 10 kcal
3. 1,000 kcal
4. 100 kcal ✓
Which is an example of herbivory?
1. Lion eating zebra
2. Caterpillar eating leaf ✓
3. Snake eating mouse
4. Hawk eating snake
Scavengers are organisms that:
1. Eat only living prey
2. Decompose all organic matter
3. Produce their own food
4. Eat dead animals (carrion) ✓
In a food web, removing one species:
1. Always improves ecosystem health
2. Only affects that one species directly
3. Has no measurable effect
4. Can cause changes across the web via interconnections ✓
Which statement about energy in food webs is TRUE?
1. Energy increases at higher trophic levels
2. Energy flows in one direction and is eventually lost as heat ✓
3. Energy can be recycled infinitely
4. Consumers create new energy
A carnivore that eats only herbivores is a:
1. Decomposer
2. Secondary consumer
3. Producer
4. Primary consumer ✓
Which factor explains why there are fewer top predators than prey animals?
1. Top predators reproduce faster
2. Prey need more space
3. Limited energy available at higher trophic levels ✓
4. Top predators are less intelligent
Decomposers are essential because they:
1. Are top predators in food webs
2. Recycle nutrients to soil for producer reuse ✓
3. Only eat living plant material
4. Compete with producers for light
In a balanced ecosystem, removing wolves (apex predators) would likely cause:
1. No change in deer population
2. Extinction of all herbivores
3. Increase in deer population leading to overgrazing ✓
4. Decrease in deer population
📖 science_quiz7_1_introduction_ecosystems
What is an ecosystem?
1. Only living organisms in an area
2. Organisms interacting with each other and their environment ✓
3. Only non-living factors in an area
4. A single species population
Which of the following is an abiotic factor?
1. Bacteria
2. Sunlight ✓
3. Plants
4. Animals
What is the correct order of ecological organization from smallest to largest?
1. Organism → Population → Community → Ecosystem ✓
2. Organism → Community → Population → Ecosystem
3. Population → Organism → Community → Ecosystem
4. Ecosystem → Community → Population → Organism
What is the difference between habitat and niche?
1. They are the same thing
2. Habitat applies only to animals
3. Habitat is where an organism lives; niche is its role in the ecosystem ✓
4. Habitat is the organism's role; niche is where it lives
Which biotic factor would be considered a decomposer?
1. Oak tree
2. Deer
3. Hawk
4. Fungi ✓
What is the ultimate energy source for most ecosystems?
1. Water
2. The Sun ✓
3. Wind
4. Soil
Which ecosystem would have the LOWEST biodiversity?
1. Coral reef
2. Tundra ✓
3. Tropical rainforest
4. Estuary
What is the biosphere?
1. A single ecosystem
2. Only terrestrial ecosystems
3. Only marine ecosystems
4. All ecosystems on Earth ✓
An organism's niche includes:
1. Only what it eats for food
2. Only where it physically lives
3. Role, diet, activity, and interactions ✓
4. Only its predators and prey
According to the competitive exclusion principle:
1. Two species can share the exact same niche indefinitely
2. All species have identical niches
3. Two species cannot occupy the same niche in the same place ✓
4. Competition never occurs between species
Which is an example of an ecosystem service?
1. Pollination by bees ✓
2. Factory emissions
3. Concrete parking lots
4. Synthetic fertilizers
A community differs from an ecosystem in that:
1. A community includes abiotic factors too
2. Community = only living; ecosystem = biotic + abiotic ✓
3. They are identical ecological concepts
4. A community is always larger than an ecosystem
What makes an ecosystem more resilient to disturbances?
1. Low biodiversity
2. High biodiversity ✓
3. Only one species
4. No species interactions
Which is an abiotic factor in a pond ecosystem?
1. Fish
2. Water pH ✓
3. Algae
4. Bacteria
An invasive species in a new ecosystem typically:
1. Lacks natural predators, may outcompete natives ✓
2. Struggles to survive in new habitat
3. Immediately goes extinct
4. Has many natural predators
What is a population?
1. All species living in an area
2. Only plants in an area
3. All abiotic factors in an area
4. Same species individuals in one area at one time ✓
Ecosystems can be:
1. Only large like oceans
2. Only small like puddles
3. Any size, from a puddle to the biosphere ✓
4. Only terrestrial habitats
Which pair represents a biotic and abiotic factor?
1. Sunlight and temperature
2. Rocks and minerals
3. Tree and soil nutrients ✓
4. Wind and rain
What happens when an ecosystem loses a keystone species?
1. Ecosystem structure dramatically changes or collapses ✓
2. Nothing changes in the ecosystem
3. Biodiversity always increases afterward
4. Only plants are affected by the loss
The term 'biodiversity' refers to:
1. Variety of life: genetic, species, and ecosystem levels ✓
2. Only the types of ecosystems
3. Only genetic variation within species
4. Only the number of species present
In which ecosystem would you expect the highest primary productivity?
1. Desert biome
2. Tropical rainforest ✓
3. Open ocean biome
4. Tundra biome
What is the primary role of producers in an ecosystem?
1. Decompose dead organic matter
2. Consume other living organisms
3. Capture sunlight energy via photosynthesis ✓
4. Release nutrients into the soil
Which ecosystem type covers the most area on Earth?
1. Rainforest
2. Desert
3. Marine (oceans) ✓
4. Grassland
Limiting factors in an ecosystem:
1. Have no effect on populations ✓
2. Restrict population growth or distribution
3. Always increase biodiversity
4. Are only biotic
An organism that can make its own food is called:
1. A consumer
2. A decomposer
3. A predator
4. A producer ✓
📖 science_quiz6_8_health_disease
Infectious disease is caused by:
1. Accidents
2. Genetics
3. Pathogens ✓
4. Poor diet
Pathogens include:
1. Only nutrients
2. Only viruses
3. Bacteria, viruses, fungi ✓
4. Only bacteria
Non-infectious disease:
1. Spreads easily
2. Always contagious
3. Only from bacteria
4. Cannot spread person-to-person ✓
Bacteria are:
1. Eukaryotic
2. Not living
3. Viruses
4. Prokaryotic cells ✓
Viruses are:
1. Always harmless
2. Cells
3. Bacteria
4. Need a host cell ✓
Antibiotics work against:
1. Only cancer
2. Bacteria ✓
3. All diseases
4. Viruses
Antibiotics don't work on viruses because:
1. Lack bacterial cell structures ✓
2. Viruses too strong
3. Wrong color
4. Viruses too large
Antibiotic resistance develops from:
1. Overuse of antibiotics ✓
2. Exercise
3. Eating well
4. Natural immunity
Immune system function:
1. Breathe
2. Digest food
3. Fight pathogens ✓
4. Pump blood
First line of defense:
1. Antibodies
2. T cell response
3. Vaccines
4. Skin, mucus, acid ✓
Phagocytes:
1. White blood cells ✓
2. Red blood cells
3. Platelets
4. Bacteria
Antibodies are:
1. Live bacteria
2. Proteins binding antigens ✓
3. Active viruses
4. Red blood cells
B cells produce:
1. T cells
2. Pathogens
3. Antibodies ✓
4. Red blood cells
Memory cells provide:
1. Nutrients
2. Immune memory ✓
3. Oxygen
4. Energy
Active immunity means:
1. Body makes own antibodies ✓
2. Receive antibodies from outside
3. No immunity
4. Temporary protection only
Passive immunity means:
1. No antibodies
2. Body makes own
3. Permanent protection
4. Receive antibodies from outside ✓
Vaccines contain:
1. Antibiotics
2. Live dangerous pathogens
3. No biological material
4. Weakened/dead pathogen or parts ✓
Vaccines work by:
1. Creating memory cells without disease ✓
2. Removing pathogens
3. Killing all bacteria
4. Providing immediate treatment
Herd immunity means:
1. Most people vaccinated ✓
2. Animals protected
3. No one vaccinated
4. Everyone sick
Disease transmission includes:
1. Contact, droplets, vectors ✓
2. Only through air
3. Only through water
4. Only through food
Best way to prevent infection:
1. Never leave house
2. Take antibiotics daily
3. Wash hands frequently ✓
4. Avoid all people
Healthy lifestyle includes:
1. No sleep needed
2. Diet, exercise, sleep ✓
3. Only diet
4. Only exercise
Type 2 diabetes is:
1. Always genetic only
2. Lifestyle-related ✓
3. Caused by virus
4. Contagious
Cancer risk reduced by:
1. Diet and exercise ✓
2. Smoking
3. Poor diet
4. No exercise
Global health challenge:
1. Everyone healthy
2. Antibiotic resistance ✓
3. No diseases left
4. Too many vaccines
📖 science_quiz6_7_human_body_systems
Circulatory system function:
1. Conscious thinking
2. Transport materials ✓
3. Food digestion
4. Lung breathing
Heart has how many chambers?
1. Four chambers ✓
2. Three
3. Two
4. One
Arteries carry blood:
1. Away from heart ✓
2. Nowhere
3. Only to lungs
4. To heart
Veins carry blood:
1. Nowhere
2. To heart ✓
3. Away from heart
4. Only from lungs
Gas exchange occurs in:
1. Trachea
2. Nose
3. Alveoli ✓
4. Bronchi
Diaphragm is:
1. Muscle for breathing ✓
2. Bone protecting lungs
3. Air tube
4. Blood vessel
Digestion begins in:
1. Large intestine
2. Stomach
3. Mouth ✓
4. Small intestine
Most nutrient absorption occurs in:
1. Stomach
2. Large intestine
3. Mouth
4. Small intestine ✓
Large intestine mainly absorbs:
1. Water ✓
2. Glucose
3. Proteins
4. Vitamins only
Liver produces:
1. Bile ✓
2. Gastric juice
3. Insulin
4. Saliva
Pancreas produces:
1. Only saliva
2. Only bile
3. No secretions
4. Enzymes and insulin ✓
Brain is part of:
1. Digestive system
2. Central nervous system ✓
3. Peripheral nervous system
4. Circulatory system
Nerves throughout body are:
1. Only sensory
2. Not nervous system
3. Peripheral nervous system ✓
4. Central nervous system
Reflex is:
1. Automatic response ✓
2. Conscious decision
3. Slow reaction
4. Learned behavior
Skeletal system functions include:
1. Support, protect, move ✓
2. Only movement
3. Digestion
4. Only support
How many bones in adult human?
1. 206 ✓
2. 300
3. 500
4. 100
Ligaments connect:
1. Muscle to bone
2. Nerve to brain
3. Organs together
4. Bone to bone ✓
Tendons connect:
1. Organs together
2. Nerve to muscle
3. Muscle to bone ✓
4. Bone to bone
Skeletal muscle is:
1. Voluntary ✓
2. Involuntary
3. Only in heart
4. Not controlled
Cardiac muscle is:
1. Attached to bones
2. In heart, involuntary ✓
3. In all organs
4. Voluntary
Smooth muscle is:
1. Only in heart
2. Involuntary, in organs ✓
3. Attached to bones
4. Voluntary
Muscles work in:
1. Random patterns
2. Groups of ten
3. Isolation
4. Antagonistic pairs ✓
Homeostasis is:
1. Stable internal conditions ✓
2. Only temperature
3. Growth process
4. Change in environment
Kidneys function:
1. Store bile
2. Filter blood, produce urine ✓
3. Produce hormones only
4. Digest food
Endocrine system uses:
1. Electrical signals only
2. Bones
3. Muscles
4. Hormones ✓
📖 science_quiz6_6_dna_genes_heredity
DNA stands for:
1. Double Nitrogen Acid
2. Deoxyribonucleic Acid ✓
3. Dynamic Nucleotide Array
4. Dual Nuclear Acid
DNA structure is:
1. Triple helix
2. Square
3. Double helix ✓
4. Single strand
DNA base pairing rule:
1. A pairs with G
2. T pairs with G
3. A with T, G with C ✓
4. Random pairing
Gene is:
1. DNA section coding for trait ✓
2. Type of cell
3. Entire chromosome
4. Type of protein
Alleles are:
1. Identical genes
2. Types of chromosomes
3. Proteins
4. Different forms of a gene ✓
Genotype is:
1. Genetic makeup (letters) ✓
2. Protein structure
3. Type of organism
4. Physical appearance
Phenotype is:
1. Genetic makeup
2. DNA sequence
3. Chromosome number
4. Observable trait ✓
Dominant allele:
1. Same as recessive
2. Never expressed
3. Expressed when present
4. Only expressed with two copies ✓
Recessive allele:
1. Always expressed
2. Needs two copies to be expressed ✓
3. Expressed with one copy
4. Never expressed
Homozygous means:
1. Two different alleles
2. One allele only
3. Two identical alleles ✓
4. No alleles
Heterozygous means:
1. Two different alleles ✓
2. No alleles
3. One allele only
4. Two identical alleles
Punnett square is used to:
1. Observe cells
2. Count chromosomes
3. Predict offspring genotypes ✓
4. Measure DNA
Cross Rr × Rr produces ratio:
1. 1:1 ratio
2. 3:1 phenotypic ratio ✓
3. All recessive
4. All dominant
Cross RR × rr produces:
1. All Rr ✓
2. All RR
3. 1:1 ratio
4. All rr
Mutation is:
1. Change in DNA sequence ✓
2. Normal DNA replication
3. Type of protein
4. Cell division
Most mutations are:
1. Always neutral
2. Always harmful
3. Harmful or neutral ✓
4. Always beneficial
Mutations can be caused by:
1. Eating food
2. Replication errors or mutagens ✓
3. Only inheritance
4. Normal cell function
Sex-linked traits are:
1. On X or Y chromosome ✓
2. Not inherited
3. On all chromosomes equally
4. Only in males
Males have chromosomes:
1. XX
2. YY
3. XO
4. XY ✓
Females have chromosomes:
1. XY
2. YY
3. XO
4. XX ✓
X-linked recessive traits more common in:
1. Both equally
2. Neither
3. Males ✓
4. Females
Incomplete dominance produces:
1. Blended phenotype in heterozygote ✓
2. Dominant phenotype only
3. Recessive phenotype only
4. Both phenotypes separately
Codominance shows:
1. Blended phenotype
2. One dominates
3. Both alleles fully expressed ✓
4. No expression
DNA replication is:
1. Creates entirely new DNA
2. Random process
3. Doesn't occur
4. Semi-conservative ✓
Genetic variation important for:
1. Nothing
2. Preventing reproduction
3. Harming organisms
4. Evolution and adaptation ✓
📖 science_quiz6_5_cell_division
Cells divide for:
1. Only for growth
2. Only reproduction
3. No clear reason
4. Growth, repair, reproduction ✓
Cell cycle consists of:
1. Only cytokinesis
2. Three equal parts
3. Interphase and M phase ✓
4. Only mitosis
DNA replication occurs in:
1. G₁ phase
2. S phase ✓
3. Mitosis
4. Cytokinesis
Mitosis produces:
1. One large cell
2. Two identical daughter cells ✓
3. No cells
4. Four different cells
Stages of mitosis in order:
1. PMAT in reverse order
2. Prophase, Metaphase, Anaphase, Telophase ✓
3. Stages in random order
4. Only two stages total
In prophase:
1. Chromatids separate
2. Chromosomes condense, become visible ✓
3. Chromosomes line up
4. Nuclear membrane reforms
In metaphase:
1. Cytokinesis occurs
2. Chromosomes line up at equator ✓
3. Chromosomes condense
4. Chromatids separate
In anaphase:
1. Sister chromatids separate ✓
2. Nuclear membrane breaks
3. Chromosomes line up
4. Chromosomes condense
In telophase:
1. Chromosomes line up
2. Chromatids separate
3. Nuclear membranes reform ✓
4. DNA replicates
Cytokinesis is:
1. Division of nucleus
2. Division of cytoplasm ✓
3. DNA replication
4. Chromosome condensation
Animal cell cytokinesis:
1. Wall builds outward
2. Cleavage furrow pinches inward ✓
3. Cell plate forms
4. No division occurs
Plant cell cytokinesis:
1. Pinching inward
2. Cell plate forms outward ✓
3. Cleavage furrow
4. No division
Sister chromatids are:
1. Different chromosomes
2. Types of proteins
3. Parts of nucleus
4. Identical copies of chromosome ✓
Centromere is:
1. Part of nucleus
2. Spindle fiber
3. Where sister chromatids join ✓
4. End of chromosome
Human cells have:
1. 92 chromosomes
2. 100 chromosomes
3. 46 chromosomes ✓
4. 23 chromosomes
After mitosis, each daughter cell has:
1. No chromosomes
2. Double the chromosomes
3. Same number of chromosomes as parent ✓
4. Half the chromosomes
Checkpoints in cell cycle:
1. Prevent errors in division ✓
2. Speed up division
3. Have no function
4. Only in cancer
Cancer is:
1. Cell death
2. Normal division
3. Controlled growth
4. Uncontrolled cell division ✓
Cancer cells:
1. Ignore stop signals ✓
2. Never divide
3. Follow all signals
4. Always die quickly
Benign tumor:
1. Spreads to other tissues
2. Always fatal
3. Stays in one place ✓
4. Not a tumor
Malignant tumor:
1. Not cancerous
2. Harmless
3. Stays in place
4. Cancerous, can spread ✓
Metastasis means:
1. Cell division stops
2. Cancer spreads to tissues ✓
3. Cancer cured
4. Tumor shrinks
Carcinogens are:
1. Normal cells
2. Vitamins
3. Cancer treatments
4. Cancer-causing agents ✓
Why do organisms stay small-celled?
1. High SA:V ratio ✓
2. Random
3. Look better
4. Cannot divide large cells
Interphase takes up:
1. ~90% of cell cycle ✓
2. 0% of cycle
3. ~10% of cycle
4. 50% of cycle
📖 science_quiz6_4_cellular_respiration
Cellular respiration breaks down:
1. ATP to make glucose
2. Proteins into amino acids
3. Glucose to release ATP ✓
4. Water into oxygen
Cellular respiration equation reactants:
1. CO₂ + H₂O
2. ATP + glucose
3. Glucose + O₂ ✓
4. Light + water
Cellular respiration equation products:
1. CO₂ + H₂O + ATP ✓
2. Glucose + O₂
3. Only CO₂
4. Only ATP
Cellular respiration occurs in:
1. Only bacteria
2. Only animal cells
3. Only plant cells
4. All living cells ✓
Most ATP produced in:
1. Chloroplasts
2. Cytoplasm
3. Mitochondria ✓
4. Nucleus
ATP stands for:
1. Active Transport Pump
2. Adenine Triple Protein
3. Atomic Transfer Process
4. Adenosine Triphosphate ✓
ATP releases energy by:
1. Breaking phosphate bond ✓
2. Adding phosphates
3. Combining with glucose
4. Destroying adenine
Aerobic respiration requires:
1. Oxygen ✓
2. Only water
3. Only CO₂
4. No oxygen
Aerobic respiration produces:
1. 2 ATP per glucose ✓
2. 0 ATP
3. ~36-38 ATP per glucose
4. 100 ATP
Anaerobic respiration produces:
1. About 100 ATP
2. 2 ATP per glucose ✓
3. No ATP made
4. 36-38 ATP
Glycolysis occurs in:
1. Cytoplasm ✓
2. Nucleus
3. Mitochondria
4. Chloroplast
Glycolysis produces net:
1. 4 ATP
2. 36 ATP
3. 0 ATP
4. 2 ATP ✓
Krebs cycle occurs in:
1. Cell cytoplasm
2. Thylakoids
3. Mitochondrial matrix ✓
4. Cell nucleus
Electron transport chain occurs in:
1. Cell nucleus
2. Outer cell membrane
3. Inner mitochondrial membrane ✓
4. Cell cytoplasm
Oxygen's role in respiration:
1. Produces glucose
2. Initial reactant in glycolysis
3. Not involved
4. Final electron acceptor ✓
Lactic acid fermentation occurs:
1. Only in yeast
2. In muscles during exercise ✓
3. Only in plants
4. In mitochondria always
Alcoholic fermentation produces:
1. Glucose
2. Only ATP
3. Ethanol + CO₂ ✓
4. Lactic acid
Alcoholic fermentation used in:
1. Brewing and baking ✓
2. Energy production in humans
3. Medicine only
4. Photosynthesis
Lactic acid buildup causes:
1. Muscle fatigue ✓
2. No effects
3. Faster running
4. Increased energy
Oxygen debt means:
1. Extra O₂ needed after exercise ✓
2. No oxygen available
3. Too much oxygen
4. Debt to pay
Cellular respiration is:
1. Unrelated to photosynthesis
2. Only in animals
3. Same as photosynthesis
4. Opposite of photosynthesis ✓
Why do we breathe?
1. Remove water
2. Get glucose
3. Only to talk
4. Get O₂, remove CO₂ ✓
During rest:
1. Aerobic respiration sufficient ✓
2. No respiration
3. Only glycolysis
4. Always anaerobic
During intense exercise:
1. Aerobic increases enough
2. Switch to anaerobic fermentation ✓
3. Stop respiration
4. No energy needed
Efficiency of cellular respiration:
1. ~38-40% ✓
2. Nearly 100%
3. About 10%
4. About 0%
📖 science_quiz6_3_photosynthesis
Photosynthesis converts:
1. ATP to glucose
2. Chemical to light
3. Heat to light
4. Light to chemical energy ✓
Photosynthesis equation reactants:
1. CO₂ + H₂O + light ✓
2. CO₂ + O₂
3. ATP + H₂O
4. Glucose + O₂
Photosynthesis equation products:
1. ATP only
2. CO₂ + H₂O
3. Glucose + O₂ ✓
4. Water only
Photosynthesis occurs in:
1. Ribosomes
2. Chloroplasts ✓
3. Mitochondria
4. Nucleus
Chlorophyll is:
1. Colorless protein
2. Type of sugar
3. Green pigment absorbing light ✓
4. Oxygen molecule
Chlorophyll absorbs mainly:
1. Only infrared
2. Red and blue light ✓
3. Green light
4. Only UV
Light-dependent reactions occur in:
1. Cell nucleus
2. Thylakoid membranes ✓
3. Cytoplasm
4. Chloroplast stroma
Calvin cycle occurs in:
1. Stroma ✓
2. Cytoplasm
3. Thylakoids
4. Mitochondria
Light reactions produce:
1. CO₂ and water
2. ATP, NADPH, O₂ ✓
3. Only oxygen
4. Glucose only
Calvin cycle produces:
1. Oxygen
2. Light
3. Water
4. Glucose ✓
Oxygen in photosynthesis comes from:
1. Water (H₂O) ✓
2. Glucose
3. Carbon dioxide
4. Air
Increasing light intensity:
1. Decreases rate
2. Stops photosynthesis
3. Increases rate (to a limit) ✓
4. No effect
Increasing CO₂:
1. No effect
2. Increases rate (to a limit) ✓
3. Stops photosynthesis
4. Decreases rate
Optimal temperature for most plants:
1. 0-10°C
2. 100°C
3. 25-35°C ✓
4. 50-60°C
Too high temperature:
1. Produces more glucose
2. Increases rate indefinitely
3. No effect
4. Denatures enzymes, rate drops ✓
Limiting factor is:
1. Always light
2. Factor in shortest supply ✓
3. Temperature only
4. Most abundant factor
Stomata function:
1. Gas exchange ✓
2. Photosynthesis
3. Protein synthesis
4. Water storage
Stomata are controlled by:
1. Root cells
2. Guard cells ✓
3. Chloroplasts
4. Mitochondria
Stomata generally open:
1. Always equally
2. Never
3. During day ✓
4. At night
Photosynthesis importance:
1. Removes water
2. Only makes oxygen
3. Only makes food
4. Produces food and oxygen ✓
C4 plants are adapted to:
1. No sunlight
2. Hot, dry conditions ✓
3. Darkness
4. Cold, wet conditions
CAM plants open stomata:
1. During day
2. Always
3. At night ✓
4. Never
Palisade mesophyll contains:
1. Only mitochondria
2. Many chloroplasts ✓
3. No chloroplasts
4. Cell walls only
Photosynthesis and respiration are:
1. Identical processes
2. Unrelated
3. Complementary processes ✓
4. Both produce glucose
Early photosynthetic organisms:
1. Removed all oxygen
2. Had no effect
3. Lived without water
4. Created oxygen atmosphere ✓
📖 science_quiz6_2_cell_processes_transport
Passive transport requires:
1. Only proteins
2. No energy ✓
3. Heat energy
4. ATP
Active transport requires:
1. Only water
2. ATP (energy) ✓
3. Sunlight
4. No energy
Diffusion is movement from:
1. Only in water
2. Low to high
3. High to low concentration ✓
4. Random directions
Osmosis is diffusion of:
1. Salt
2. Glucose
3. Protein
4. Water ✓
Cell membrane structure:
1. Single protein layer
2. Phospholipid bilayer ✓
3. Cellulose wall
4. Pure lipid
Hypertonic solution has:
1. No solute
2. More solute than cell ✓
3. Same concentration
4. Less solute than cell
In hypertonic solution, cell:
1. Bursts open
2. Stays same
3. Swells up
4. Shrinks, loses water ✓
Hypotonic solution has:
1. Only solute
2. Less solute than cell ✓
3. More solute than cell
4. Same concentration
In hypotonic solution, animal cell:
1. Stays same
2. Becomes turgid without bursting
3. Shrinks
4. Swells and may burst ✓
In hypotonic solution, plant cell:
1. Bursts open
2. Dies quickly
3. Becomes turgid ✓
4. Shrinks down
Isotonic solution:
1. Pure water
2. Less concentrated
3. Same concentration as cell ✓
4. More concentrated
Facilitated diffusion uses:
1. ATP energy
2. Cell wall
3. Only lipids
4. Transport proteins ✓
Channel proteins:
1. Form pores for substances ✓
2. Digest materials
3. Produce ATP
4. Pump substances uphill
Sodium-potassium pump:
1. Uses ATP to pump ions ✓
2. Uses no energy
3. Only in plants
4. Pumps water
Endocytosis is:
1. Expelling materials
2. Simple diffusion
3. Taking materials into cell ✓
4. Osmosis
Exocytosis is:
1. Passive diffusion
2. Expelling materials ✓
3. Taking in materials
4. Osmosis
Phagocytosis is:
1. Pumping ions
2. Cell eating ✓
3. Diffusion
4. Cell drinking
Pinocytosis is:
1. Cell drinking ✓
2. Protein synthesis
3. Ion pumping
4. Cell eating
Concentration gradient is:
1. Difference in concentration ✓
2. Temperature difference
3. Pressure difference
4. Same concentration everywhere
Equilibrium means:
1. All molecules stop moving
2. Equal concentration, no net movement ✓
3. No molecules present
4. High concentration everywhere
What increases diffusion rate?
1. Smaller surface area
2. Higher temperature ✓
3. Larger distance
4. Lower temperature
Cell membrane is selectively permeable meaning:
1. Only water passes
2. Everything passes freely
3. Some substances pass, others blocked ✓
4. Nothing can pass
Small nonpolar molecules diffuse:
1. Not at all
2. Easily through membrane ✓
3. Only with ATP
4. Only through proteins
Large polar molecules:
1. Only cross in plants
2. Cross easily
3. Need protein help to cross ✓
4. Never cross
Why use active transport?
1. Accumulate against gradient ✓
2. To destroy molecules
3. Save energy
4. For passive movement
📖 science_quiz6_1_cell_structure
The cell is:
1. Always visible to naked eye
2. The basic unit of life ✓
3. Only in animals
4. A type of tissue
Cell theory states:
1. Only animals have cells
2. All living things made of cells ✓
3. Cells are made of organs
4. Cells don't reproduce
Cell theory states cells come from:
1. Rocks
2. Air
3. Pre-existing cells ✓
4. Spontaneous generation
Prokaryotic cells:
1. Lack a nucleus ✓
2. Have a nucleus
3. Are the largest cells
4. Are only in plants
Eukaryotic cells:
1. Have a nucleus ✓
2. Lack a nucleus
3. Are only bacteria
4. Have no organelles
Which is larger?
1. Eukaryotic cells ✓
2. Both same size
3. Prokaryotic cells
4. Viruses
Examples of prokaryotes:
1. Plants
2. Fungi
3. Animals
4. Bacteria ✓
The nucleus contains:
1. Only proteins
2. DNA ✓
3. Only RNA
4. Digestive enzymes
Mitochondria are:
1. Storage organelles
2. Protein factories
3. DNA containers
4. Powerhouses producing ATP ✓
Chloroplasts are found in:
1. Animal cells
2. Plant cells ✓
3. All cells
4. Bacterial cells
Cell wall is found in:
1. Plant cells ✓
2. Animal cells
3. All eukaryotes
4. No cells
Cell wall is made of:
1. Lipids
2. Protein
3. DNA
4. Cellulose ✓
Large central vacuole is found in:
1. Bacteria
2. All cells equally
3. Animal cells
4. Plant cells ✓
Ribosomes function to:
1. Digest materials
2. Produce ATP
3. Synthesize proteins ✓
4. Store water
The cell membrane is:
1. Completely impermeable
2. Only in plants
3. Selectively permeable ✓
4. Made of cellulose
Lysosomes contain:
1. Digestive enzymes ✓
2. Chlorophyll
3. Ribosomes
4. Stored DNA
Endoplasmic reticulum functions in:
1. Cell division only
2. ATP production
3. Protein and lipid synthesis ✓
4. Photosynthesis
Golgi apparatus:
1. Stores DNA
2. Packages proteins ✓
3. Produces ATP
4. Makes proteins
Centrioles are found in:
1. Bacteria
2. All prokaryotes
3. Plant cells
4. Animal cells ✓
Organization levels from smallest:
1. Organelles → atoms → cells
2. Cells → atoms → organs
3. Atoms → molecules → organelles → cells ✓
4. Organs → cells → atoms
Why do cells stay small?
1. They look better small
2. High surface area to volume ratio ✓
3. Random chance
4. Cannot grow larger
Tissues are:
1. Individual cells
2. Single organs
3. Groups of similar cells ✓
4. Whole organisms
Organs are made of:
1. One type of tissue only
2. Different tissues together ✓
3. Individual cells
4. Atoms
Who first observed cells?
1. Charles Darwin
2. Albert Einstein
3. Robert Hooke ✓
4. Isaac Newton
Light microscope can magnify up to:
1. ~1,000,000×
2. ~1000× ✓
3. ~10×
4. ~100,000×
📖 science_quiz5_8_waves
Wave transfers:
1. Matter
2. Magnetism
3. Temperature
4. Energy not matter ✓
Mechanical waves need:
1. No medium (vacuum)
2. Only magnetic field
3. Only electric field
4. A medium to travel through ✓
Electromagnetic waves:
1. Don't need a medium ✓
2. Need water to travel
3. Need air to travel
4. Cannot travel
In transverse wave, oscillation is:
1. Circular
2. Perpendicular to wave ✓
3. Parallel to wave direction
4. Random
In longitudinal wave, oscillation is:
1. Parallel to wave direction ✓
2. No oscillation
3. Perpendicular to wave direction
4. Random
Sound waves are:
1. Longitudinal ✓
2. Transverse
3. Electromagnetic
4. Don't exist
Light waves are:
1. Circular
2. Stationary
3. Longitudinal mechanical
4. Transverse electromagnetic ✓
Wavelength (λ) is:
1. Time for one wave
2. Speed of wave
3. Height of wave
4. Crest-to-crest distance ✓
Amplitude is:
1. Speed of wave
2. Maximum displacement from equilibrium ✓
3. Distance between crests
4. Number of waves per second
Frequency (f) is:
1. Height of wave
2. Number of waves per second ✓
3. Speed of wave
4. Distance between waves
Unit of frequency is:
1. Hertz (Hz) ✓
2. Meter per second (m/s)
3. Meter (m)
4. Second (s)
Period (T) is:
1. Time for one complete wave ✓
2. Wave speed
3. Distance between waves
4. Number of waves
Relationship between frequency and period:
1. f = 1/T ✓
2. f = 2T
3. f = T²
4. f = T
Wave equation is:
1. v = fλ ✓
2. v = f/λ
3. v = f - λ
4. v = f + λ
Wave with f=100Hz, λ=2m has speed:
1. 98 m/s
2. 200 m/s ✓
3. 50 m/s
4. 102 m/s
Reflection is when wave:
1. Bends entering new medium
2. Combines with another wave
3. Bounces off surface ✓
4. Spreads around obstacle
Refraction is when wave:
1. Bends entering different medium ✓
2. Bounces off surface
3. Spreads around obstacle
4. Stops completely
Diffraction is when wave:
1. Spreads around obstacles/openings ✓
2. Changes speed in new medium
3. Stops at barrier
4. Bounces off surface
Constructive interference:
1. One wave stops
2. Waves cancel (silent/dark)
3. Waves don't interact
4. Waves add (louder/brighter) ✓
Destructive interference:
1. Waves add
2. Waves reflect
3. Waves don't interact
4. Waves cancel out ✓
Sound cannot travel through:
1. Air
2. Solids
3. Vacuum ✓
4. Water
Speed of sound in air (~20°C):
1. ~3×10⁸ m/s
2. ~1500 m/s
3. ~343 m/s ✓
4. ~5000 m/s
Pitch of sound related to:
1. Frequency ✓
2. Amplitude
3. Wavelength only
4. Speed
Loudness related to:
1. Wavelength only
2. Amplitude ✓
3. Frequency
4. Speed
Electromagnetic spectrum from longest to shortest wavelength:
1. Gamma, X-ray, UV, Visible, IR, Microwave, Radio
2. Visible, IR, UV, X-ray, Gamma, Radio, Microwave
3. Radio, Microwave, IR, Visible, UV, X-ray, Gamma ✓
4. Random order
📖 science_quiz5_7_electromagnetic_induction
Electromagnetic induction is:
1. Static magnetism
2. Magnetism from electricity
3. Current creating magnetic field
4. Producing voltage with changing magnetic field ✓
Who discovered electromagnetic induction?
1. Michael Faraday ✓
2. Georg Ohm
3. Isaac Newton
4. Hans Ørsted
For induction to occur, magnetic field must:
1. Be static
2. Be very weak
3. Change (move or vary) ✓
4. Be permanent only
Faster change in magnetic field produces:
1. Higher induced voltage ✓
2. No voltage
3. Lower voltage
4. Constant voltage
Faraday's Law states:
1. Voltage = current × resistance
2. Charge is conserved
3. Force = mass × acceleration
4. Induced voltage ∝ rate of field change ✓
More turns in coil:
1. Decreases voltage
2. Increases induced voltage ✓
3. Reverses polarity
4. No effect on voltage
Lenz's Law states:
1. Induced current helps the change
2. Voltage increases indefinitely
3. Current is always same direction
4. Induced current opposes the change that caused it ✓
Lenz's Law ensures:
1. Conservation of energy ✓
2. Magnetism is stronger
3. Current flows faster
4. Voltage is higher
Dropping magnet through copper tube:
1. Falls slowly (eddy currents) ✓
2. Falls at normal speed
3. Doesn't fall
4. Falls faster
AC generator produces:
1. Alternating current ✓
2. Direct current only
3. Static charge
4. No current
AC generator uses:
1. Battery
2. Commutator
3. Slip rings ✓
4. No connection
DC generator uses:
1. No switching device
2. Capacitors only
3. Commutator for pulsating DC ✓
4. Slip rings
Power station generator:
1. Uses static magnets only
2. Rotates coil in magnetic field ✓
3. Produces no power
4. Requires no rotation
Transformer changes:
1. Power amount
2. DC voltage
3. Current to voltage
4. AC voltage up or down ✓
Transformer cannot work with:
1. Any voltage
2. DC voltage ✓
3. AC
4. Any current
Transformer has:
1. Two coils on iron core ✓
2. No coils
3. One coil only
4. Air core only
Transformer equation:
1. Vs = Vp always
2. Vs + Vp = 0
3. Vs × Vp = constant
4. Vs/Vp = Ns/Np ✓
Step-up transformer:
1. Ns > Np, increases voltage ✓
2. No turns needed
3. Ns = Np
4. Ns < Np, decreases voltage
Step-down transformer:
1. Ns > Np, increases voltage
2. Ns < Np, decreases voltage ✓
3. Ns = Np
4. Cannot decrease voltage
Transformer with 1000 primary turns, 100 secondary, 240V in:
1. 2.4 V out
2. 240 V out
3. 2400 V out
4. 24 V out ✓
Ideal transformer conserves:
1. Resistance
2. Voltage
3. Power (Pin=Pout) ✓
4. Current
Power transmission uses high voltage to:
1. Make more power
2. Increase current
3. Reduce current and power loss ✓
4. Slow electrons
Induction cooktop works by:
1. Open flame
2. Microwave radiation
3. Direct heating element
4. Induced currents heat metal pan ✓
Wireless charging uses:
1. EM induction ✓
2. Direct contact
3. Radio waves only
4. Laser
Eddy currents are:
1. Static charges
2. Circular induced currents ✓
3. Magnetic fields
4. Straight-line currents
📖 science_quiz5_6_electromagnets_motors
Electromagnet is:
1. Permanent magnet
2. Temporary magnet from current ✓
3. Natural magnet
4. Magnet that produces electricity
Who discovered magnetic effect of current?
1. Faraday
2. Ohm
3. Ørsted ✓
4. Ampere
Electromagnet strength increases with:
1. Current, turns, Fe core ✓
2. Fewer turns
3. Air core only
4. Less current
Iron core in electromagnet:
1. Decreases field strength
2. Prevents magnetism
3. Greatly increases field strength ✓
4. Has no effect
Advantage of electromagnet over permanent magnet:
1. Cheaper
2. Lighter
3. Always magnetic
4. On/off, adjustable ✓
Solenoid is:
1. Capacitor
2. Current-carrying coil ✓
3. Resistor
4. Type of battery
Electromagnetic relay is:
1. Resistor
2. Power source
3. Type of generator
4. EM-controlled switch ✓
Electromagnetic crane uses:
1. Permanent magnet
2. Air pressure
3. Electromagnet to lift metal ✓
4. Hooks and chains only
Electric bell works by:
1. Spring mechanism only
2. EM attracting armature repeatedly ✓
3. Permanent magnet
4. Air vibration
Electric motor converts:
1. Electrical energy to mechanical ✓
2. Heat to electricity
3. Light to motion
4. Mechanical to electrical
Force on current-carrying wire in magnetic field:
1. No force
2. Parallel to field
3. Parallel to current
4. Perpendicular to I and B ✓
Fleming's Left-Hand Rule predicts:
1. Force on current in field ✓
2. Voltage
3. Field direction only
4. Current direction
Motor needs commutator to:
1. Reverse current half-turn ✓
2. Cool motor
3. Increase voltage
4. Reduce friction
To make motor spin faster:
1. Decrease current
2. Weaker magnets
3. Add resistance
4. More current/stronger magnets ✓
DC motor uses:
1. Slip rings only
2. No switching
3. Commutator switches it ✓
4. AC only
AC motor doesn't need commutator because:
1. AC is faster
2. AC needs no switching
3. AC current reverses itself ✓
4. AC is stronger
Generator converts:
1. Mechanical energy to electrical ✓
2. Heat to electricity
3. Chemical to electrical
4. Electrical to mechanical
Motor and generator are:
1. Completely different
2. Motors can't be generators
3. Same device, opposite operations ✓
4. Generators can't be motors
Regenerative braking:
1. Wastes energy
2. Doesn't exist
3. Motor as generator to brake ✓
4. Uses friction only
Maglev train uses:
1. EM levitation ✓
2. Air pressure
3. Permanent magnets only
4. Friction
MRI machine uses:
1. No magnets
2. Weak electromagnets
3. Permanent magnets
4. Very strong electromagnets ✓
Circuit breaker uses electromagnet to:
1. Generate electricity
2. Reduce resistance
3. Increase voltage
4. Open circuit when current too high ✓
Advantages of electric motors:
1. Loud, smoky
2. Cannot reverse
3. Efficient, controllable, clean ✓
4. Need fuel constantly
Electric motor in hard drive:
1. Spins disk at high speed ✓
2. Cools disk
3. Stores data
4. Moves read/write head
Right-hand grip rule for solenoid:
1. No relation to poles
2. Only for permanent magnets
3. Thumb shows current direction
4. Fingers curl with current, thumb = N pole ✓
📖 science_quiz5_5_magnetism
Magnetism is:
1. Form of heat
2. Type of electricity
3. Chemical reaction
4. Non-contact attract/repel force ✓
Every magnet has:
1. Two poles (N and S) ✓
2. One pole only
3. No poles
4. Three poles
If you cut a magnet in half:
1. Destroy magnetism
2. Get only N poles
3. Get isolated N and S poles
4. Get two magnets, each with N and S ✓
Like magnetic poles:
1. Have no effect
2. Attract each other
3. Cancel each other
4. Repel each other ✓
Unlike magnetic poles:
1. Cancel completely
2. Have no effect
3. Attract each other ✓
4. Repel each other
Magnetic field is:
1. Heat energy
2. Region where magnetic force acts ✓
3. Physical substance
4. Type of electric current
Magnetic field lines go from:
1. North to South outside ✓
2. South to North
3. Random directions
4. Center outward
Where is magnetic field strongest?
1. Far from magnet
2. At the poles ✓
3. Everywhere equal
4. In the middle
Magnetic field lines:
1. Sometimes cross
2. Never cross each other ✓
3. Always cross
4. Often cross
Iron filings show magnetic field because:
1. Filings contain electricity
2. Each filing becomes temporary magnet ✓
3. Filings are heavy
4. Filings are naturally magnetic
Which is ferromagnetic material?
1. Copper
2. Plastic
3. Iron ✓
4. Wood
Magnetic domains are:
1. Regions with aligned atomic magnets ✓
2. Holes in materials
3. Large magnetic fields
4. Electric charges
In unmagnetized iron:
1. Domains are randomly oriented
2. No domains present
3. All domains aligned
4. Domains repel each other ✓
In magnetized iron:
1. Domains are random
2. Domains aligned same direction ✓
3. Domains reverse
4. Domains disappear
Induced magnetism means:
1. Magnetism destroyed
2. Permanent magnetism created
3. Temporary magnetism in iron near magnet ✓
4. Magnetism reversed
To make permanent magnet:
1. Cool it rapidly
2. Just expose to magnet briefly
3. Hit it randomly
4. Align domains (stroke, heat, current) ✓
To demagnetize:
1. Cool it
2. Polish surface
3. Heat, hammer, or AC field ✓
4. Expose to another magnet
Curie temperature is when:
1. Material freezes
2. Material loses magnetism ✓
3. Material becomes magnetic
4. Material melts
Earth's magnetic field is caused by:
1. Magnetic poles
2. Molten iron in core ✓
3. Iron surface rocks
4. Sun's magnetism
Earth's magnetic north pole is:
1. Moves randomly
2. Near geographic south ✓
3. At equator
4. Near geographic north
Compass works because:
1. Needle aligns with Earth's field ✓
2. Needle is electric
3. Needle points to sun
4. Needle has gravity
Earth's magnetic field protects us from:
1. Solar wind ✓
2. Gravity
3. Sound waves
4. Visible light
Auroras (Northern Lights) are caused by:
1. Solar particles hitting field ✓
2. Earth's rotation
3. Volcanic activity
4. Moon's gravity
Animals that navigate using magnetism include:
1. Birds, turtles ✓
2. No animals
3. Only fish
4. Only insects
Magnetic field cannot be:
1. Measured
2. Detected
3. Seen directly ✓
4. Used
📖 science_quiz5_4_series_parallel_circuits
In series circuit, components are connected:
1. Across common points
2. End-to-end in single path ✓
3. In grid pattern
4. Randomly
In series circuit, current is:
1. Zero
2. Same through all ✓
3. Different through each
4. Infinite
In series circuit, voltage:
1. Is zero
2. Divides among parts ✓
3. Adds up
4. Same across all
Total resistance in series:
1. R_total = R₁ + R₂ + R₃... ✓
2. R_total = R₁/R₂
3. 1/R_total = 1/R₁ + 1/R₂...
4. R_total = R₁ × R₂
Three 10 Ω resistors in series, total resistance:
1. 3.33 Ω
2. 100 Ω
3. 30 Ω ✓
4. 10 Ω
In series circuit, if one component fails:
1. Voltage increases
2. Others continue working
3. Current increases
4. Entire circuit stops ✓
In parallel circuit, components are connected:
1. In single line
2. End-to-end
3. Randomly
4. Across common points ✓
In parallel circuit, voltage is:
1. Different across each
2. Zero
3. Same across all ✓
4. Divides
In parallel circuit, current:
1. Divides among branches
2. Same in all branches ✓
3. Zero
4. Infinite
Total resistance in parallel:
1. R_total = R₁ + R₂ + R₃...
2. 1/R_total = 1/R₁ + 1/R₂... ✓
3. R_total = R₁ × R₂
4. R_total = R₁ - R₂
Three identical 30 Ω resistors in parallel, total:
1. 30 Ω
2. 3.33 Ω
3. 90 Ω
4. 10 Ω ✓
In parallel circuit, total resistance is:
1. Equal to average
2. Greater than largest
3. Less than smallest individual ✓
4. Equal to sum
In parallel circuit, if one component fails:
1. Current stops
2. Entire circuit stops
3. Others continue working ✓
4. Voltage drops to zero
Home electrical wiring uses:
1. No circuits
2. Open circuits
3. Parallel circuits ✓
4. Series circuits
Old Christmas lights (series) problem:
1. Each works independently
2. One bulb out → all go out ✓
3. Current increases
4. Voltage varies
Modern Christmas lights (parallel) advantage:
1. One bulb out → rest stay lit ✓
2. Cheaper to make
3. Uses less power
4. Brighter lights
Two resistors (6Ω and 3Ω) in series, total:
1. 18 Ω
2. 2 Ω
3. 9 Ω ✓
4. 0.5 Ω
Two resistors (6Ω and 3Ω) in parallel, total:
1. 2 Ω ✓
2. 4.5 Ω
3. 9 Ω
4. 18 Ω
Series: 24V battery, R₁=6Ω, R₂=10Ω. Current is:
1. 16 A
2. 1.5 A ✓
3. 2.4 A
4. 4 A
From previous: voltage across R₂ (10Ω) is:
1. 9 V
2. 24 V
3. 15 V ✓
4. 10 V
Parallel: 12V battery, R₁=6Ω, R₂=4Ω. Total current:
1. 3 A
2. 10 A
3. 2 A
4. 5 A ✓
Kirchhoff's Current Law states:
1. Power is conserved
2. Current in = Current out at junction ✓
3. Resistance is constant
4. Voltage around loop = 0
Kirchhoff's Voltage Law states:
1. Sum of voltages around loop = 0 ✓
2. Voltage is same in parallel
3. Resistance adds in series
4. Current is same in series
To analyze combination circuit:
1. Solve randomly
2. Simplify series first
3. Cannot be solved
4. Simplify parallel, then series ✓
Advantage of parallel over series:
1. Independent operation of components ✓
2. Lower total resistance always wanted
3. Simpler wiring
4. Less current
📖 science_quiz5_3_ohms_law_circuits
Ohm's Law is:
1. V = IR ✓
2. V = I + R
3. V = I/R
4. V = R/I
If V = 12 V and R = 4 Ω, then I equals:
1. 8 A
2. 16 A
3. 48 A
4. 3 A ✓
If I = 2 A and R = 5 Ω, then V equals:
1. 3 V
2. 10 V ✓
3. 2.5 V
4. 7 V
If V = 24 V and I = 0.5 A, then R equals:
1. 12 Ω
2. 23.5 Ω
3. 24.5 Ω
4. 48 Ω ✓
If voltage doubles (R constant), current:
1. Stays same
2. Doubles ✓
3. Quadruples
4. Halves
If resistance doubles (V constant), current:
1. Doubles
2. Quadruples
3. Stays same
4. Halves ✓
A complete circuit requires:
1. Closed path for current ✓
2. Only resistor
3. Only wires
4. Only battery
Open circuit means:
1. Low resistance
2. Path is broken, no current flows ✓
3. Circuit is working
4. High current flows
Closed circuit means:
1. Complete path, current flows ✓
2. Circuit is damaged
3. Path is broken
4. No current
Short circuit occurs when:
1. Low resistance path bypasses load ✓
2. Voltage is too high
3. Switch is open
4. Circuit is too long
Short circuit causes:
1. Lower voltage
2. No current flow
3. Circuit to open
4. Excessive current and heat ✓
Circuit breaker protects against:
1. Excessive current ✓
2. High resistance
3. Open circuits
4. Low voltage
Ohmic materials have:
1. No resistance
2. Constant resistance ✓
3. Infinite resistance
4. Variable resistance
V-I graph for ohmic material is:
1. Horizontal line
2. Line through origin ✓
3. Curved line
4. Vertical line
Non-ohmic materials:
1. Have zero resistance ✓
2. Always obey Ohm's Law
3. Don't obey Ohm's Law
4. Have infinite resistance
Power can also be calculated as:
1. P = I/R²
2. P = R/I²
3. P = √(IR)
4. P = I²R ✓
Power can also be calculated as:
1. P = V/R²
2. P = √(VR)
3. P = V²/R ✓
4. P = R/V²
A 100 Ω resistor has 10 V across it. Power dissipated:
1. 100 W
2. 1 W ✓
3. 10 W
4. 1000 W
A 5 Ω resistor carries 4 A. Power dissipated:
1. 80 W ✓
2. 20 W
3. 9 W
4. 1.25 W
In circuit diagram, battery symbol shows:
1. Lines don't indicate polarity
2. Long line is positive terminal ✓
3. Both lines are negative
4. Short line is positive
Circuit symbol for resistor is:
1. Straight line
2. Zigzag or rectangle ✓
3. Circle with X
4. Triangle
Circuit symbol for lamp is:
1. Circle with X ✓
2. Rectangle
3. Diamond
4. Zigzag
A 12 V, 36 W device has resistance:
1. 48 Ω
2. 3 Ω
3. 432 Ω
4. 4 Ω ✓
For safety, never:
1. Use circuit breaker
2. Open circuit before changing
3. Connect voltmeter in parallel
4. Connect ammeter in parallel across battery ✓
Fuse works by:
1. Melting when current too high ✓
2. Storing charge
3. Decreasing voltage
4. Increasing resistance
📖 science_quiz5_2_current_voltage_resistance
Electric current is:
1. Stored electricity
2. Resistance in wires
3. Type of voltage
4. Flow of electric charge ✓
Current formula is:
1. I = V/R
2. I = Q/t ✓
3. I = P/V
4. I = FR
SI unit of current is:
1. Ampere (A) ✓
2. Volt (V)
3. Coulomb (C)
4. Ohm (Ω)
One ampere equals:
1. 1 volt per ohm
2. 1 watt per volt
3. 1 coulomb per second ✓
4. 1 joule per coulomb
If 10 C pass through a wire in 2 s, current is:
1. 12 A
2. 20 A
3. 8 A
4. 5 A ✓
Conventional current direction is:
1. Random
2. Negative to positive
3. North to south
4. Positive to negative ✓
Electrons actually flow:
1. Don't flow
2. Randomly
3. Positive to negative
4. Negative to positive ✓
Voltage is:
1. Power consumed
2. Opposition to current
3. Electrical potential difference ✓
4. Flow of charge
Voltage formula is:
1. V = Qt
2. V = IR
3. V = P/I
4. V = E/Q ✓
SI unit of voltage is:
1. Volt (V) ✓
2. Ohm (Ω)
3. Ampere (A)
4. Watt (W)
One volt equals:
1. 1 ohm per ampere
2. 1 coulomb per second
3. 1 watt per ampere
4. 1 joule per coulomb ✓
What is resistance?
1. Voltage across component
2. Flow of electrons
3. Power dissipated
4. Opposition to current flow ✓
SI unit of resistance is:
1. Ohm (Ω) ✓
2. Watt (W)
3. Volt (V)
4. Ampere (A)
Resistance increases with:
1. Thicker wire
2. Lower temperature
3. Better conductor
4. Longer wire ✓
Resistance decreases with:
1. Higher temperature (for metals)
2. Longer wire
3. Poorer conductor
4. Thicker wire ✓
Which has lowest resistance?
1. Thin, long rubber
2. Thick, short rubber
3. Thick, short copper wire ✓
4. Thin, long copper wire
Ammeter measures:
1. Power
2. Current ✓
3. Resistance
4. Voltage
Ammeter is connected:
1. In series ✓
2. In parallel
3. Across component
4. To ground only
Voltmeter measures:
1. Power
2. Voltage (p.d.) ✓
3. Current
4. Resistance
Voltmeter is connected:
1. To ground only
2. Parallel across component ✓
3. Through component
4. In series
Power formula is:
1. P = V + I
2. P = I/V
3. P = V/I
4. P = VI ✓
SI unit of power is:
1. Volt (V)
2. Ampere (A)
3. Watt (W) ✓
4. Joule (J)
A 12 V battery supplies 3 A. Power is:
1. 4 W
2. 15 W
3. 36 W ✓
4. 9 W
A 60 W bulb at 120 V draws current:
1. 180 A
2. 0.5 A ✓
3. 2 A
4. 7200 A
DC stands for:
1. Double Current
2. Direct Current ✓
3. Dynamic Current
4. Divided Current
📖 science_quiz5_1_static_electricity
What is electric charge?
1. A type of energy
2. The speed of electrons
3. Property causing EM force ✓
4. Mass of protons
Two types of electric charge are:
1. Fast and slow
2. Positive and negative ✓
3. North and south
4. Up and down
What is the charge on a proton?
1. Neutral (0)
2. Variable
3. Negative (−)
4. Positive (+) ✓
What is the charge on an electron?
1. Negative (−) ✓
2. Variable
3. Positive (+)
4. Neutral (0)
Like charges:
1. Attract each other
2. Have no effect
3. Repel each other ✓
4. Cancel each other
Opposite charges:
1. Attract each other ✓
2. Have no effect
3. Neutralize completely
4. Repel each other
Which particle can move easily in conductors?
1. Protons
2. Nuclei
3. Neutrons
4. Electrons ✓
An object becomes positively charged when it:
1. Gains electrons
2. Loses protons
3. Gains protons
4. Loses electrons ✓
An object becomes negatively charged when it:
1. Gains electrons ✓
2. Gains protons
3. Loses electrons
4. Loses protons
Charging by rubbing (friction) involves:
1. Transfer of electrons between materials ✓
2. Transfer of protons
3. Creation of new charges
4. Destruction of charges
What is a conductor?
1. Uncharged material
2. Material with no charge
3. Material allowing charge to flow easily ✓
4. Material preventing charge flow
Which is a good conductor?
1. Rubber
2. Plastic
3. Glass
4. Copper ✓
What is an insulator?
1. Material resisting charge flow ✓
2. Material with negative charge only
3. Material allowing charge flow
4. Material with positive charge only
Which is a good insulator?
1. Rubber ✓
2. Copper
3. Aluminum
4. Silver
Why do we get shocked touching doorknob after walking on carpet?
1. Doorknob creates electricity
2. Static charge buildup discharges through us ✓
3. Shoes conduct too well
4. Carpet charges the doorknob
Coulomb's Law describes:
1. Voltage in circuits
2. Force between electric charges ✓
3. Resistance of materials
4. Electric current flow
If distance between two charges doubles, force becomes:
1. 1/4 of original ✓
2. 2× original
3. 4× original
4. 1/2 of original
Electroscope is used to:
1. Store electricity
2. Measure current
3. Detect electric charge ✓
4. Measure voltage
Lightning is caused by:
1. Chemical reactions
2. Magnetic fields
3. Static buildup in clouds ✓
4. Extreme heat
Van de Graaff generator:
1. Converts AC to DC
2. Measures electric current
3. Powers motors
4. Produces very high static voltage ✓
Why do fuel trucks have grounding chains?
1. Increase fuel efficiency
2. Reduce tire wear
3. Improve braking
4. Prevent static spark igniting fuel ✓
Charged objects can attract neutral objects because:
1. Induce opposite charge on near side of neutral ✓
2. All objects have hidden charge
3. Neutral objects are actually positive
4. Magnetic force acts
Which cannot be isolated?
1. Proton
2. Single electric charge ✓
3. Single magnetic pole
4. Electron
Elementary charge (e) equals:
1. 1.6 × 10⁻²⁰ C
2. 1.6 × 10⁻¹⁹ C ✓
3. 9 × 10⁹ C
4. 1.6 × 10⁻¹⁸ C
SI unit of electric charge is:
1. Ampere (A)
2. Volt (V)
3. Ohm (Ω)
4. Coulomb (C) ✓
📖 science_quiz4_8_forces_real_world
Four forces on flying airplane at constant speed are:
1. Lift<Weight, Thrust<Drag
2. Lift>Weight, Thrust>Drag
3. Lift=Weight, Thrust=Drag ✓
4. All four equal
Airplane accelerates forward when:
1. Thrust = Drag
2. Thrust < Drag
3. Lift > Weight only
4. Thrust > Drag ✓
Airplane climbs when:
1. Thrust > Drag only
2. Lift = Weight
3. Lift < Weight
4. Lift > Weight ✓
Crumple zones in cars work by:
1. Making car heavier
2. Increasing collision force
3. Stopping car instantly
4. Extending collision time ✓
Airbags reduce injury by:
1. Stopping motion instantly
2. Increasing force
3. Decreasing stopping time
4. Increasing stopping time ✓
Anti-lock brakes (ABS) prevent:
1. Car from moving
2. Wheel lockup, maintaining steering ✓
3. Acceleration
4. Tire wear
Car's stopping distance is proportional to:
1. Speed
2. Speed squared ✓
3. Mass
4. Mass squared
If car speed doubles, stopping distance:
1. Doubles (2×)
2. Halves
3. Stays same
4. Quadruples (4×) ✓
Sprinters use starting blocks to:
1. Stretch muscles
2. Prevent slipping only
3. Look professional
4. Push backward for forward reaction ✓
Follow-through in baseball hitting:
1. Prevents bat from breaking
2. Extends contact time, more impulse ✓
3. Looks good only
4. Reduces force
Pulling glove back when catching ball:
1. Looks professional
2. Stops ball faster
3. Increases force
4. More stop time, less force ✓
Bending knees when landing from jump:
1. Looks better
2. Longer landing time, less force ✓
3. Has no physical effect
4. Increases force
Rocket works in space because:
1. Expels mass, doesn't need air ✓
2. Pushes against stars
3. Uses special fuel
4. Pushes against air
As rocket fuel burns, rocket accelerates more because:
1. Mass decreases (a = F/m) ✓
2. Gravity decreases
3. Force increases
4. Air resistance decreases
Orbit is best described as:
1. Continuous free fall while moving forward ✓
2. Being beyond gravity
3. Floating in space
4. Moving very fast upward
Satellites stay in orbit because:
1. They're beyond atmosphere only
2. Rockets keep pushing them ✓
3. They're falling and moving forward fast enough
4. There's no gravity there
Suspension bridge cables experience:
1. Compression force
2. No force
3. Shear force
4. Tension force ✓
Building columns experience:
1. Compression force ✓
2. Tension force
3. Only shear
4. No force
Triangulation in structures is strong because:
1. Triangles are rigid shapes ✓
2. Triangles are cheap
3. Triangles are light
4. Triangles look good
Why do large trucks take longer to stop?
1. More mass = more momentum ✓
2. They're always faster
3. Brakes are worse
4. Drivers react slowly
Ice skates work by:
1. Ice is slippery naturally always
2. Skates are cold
3. Small blade area creates high pressure ✓
4. They're sharp only
Hydraulic car jack multiplies force by:
1. Using levers
2. Different piston areas ✓
3. Using wheels
4. No explanation
Car brakes convert kinetic energy to:
1. Electrical energy
2. Potential energy
3. Thermal energy (heat) ✓
4. Chemical energy
Why does same engine force make sports car accelerate faster than truck?
1. Truck has more friction
2. Sports car has better tires only
3. Sports car has less mass ✓
4. Sports car has more force
Streamlined shapes reduce:
1. Air resistance ✓
2. Weight
3. Friction with ground
4. Engine force
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