Quiz Bee

1. EASY
1. Why do we need to eat food every day?
a) To keep the stomach full
b) To make us sleepy
c) To provide energy for body functions
d) To cool the body
Answer: c) To provide energy for body functions
Explanation: Food gives us energy to think, move, grow, and repair body tissues.
2. Ice melts and becomes water. What kind of change is this?
a) Chemical change
b) No change
c) Physical change
d) Permanent change
Answer: c) Physical change
Explanation: Melting is a physical change; no new substance is formed.
3. What do green plants need to make their own food?
a) Soil and wind
b) Sunlight, carbon dioxide, and water
c) Sugar and oxygen
d) Rain and fertilizer
Answer: b) Sunlight, carbon dioxide, and water
Explanation: Through photosynthesis, plants use sunlight, CO₂, and water to produce food.
4. What kind of energy does a flashlight use to make light?
a) Heat energy
b) Kinetic energy
c) Electrical energy
d) Sound energy
Answer: c) Electrical energy
Explanation: A flashlight converts electrical energy into light.
5. Why is planting more trees good for the environment?
a) Trees make noise
b) Trees use carbon dioxide and give oxygen
c) Trees attract animals
d) Trees cause rain
Answer: b) Trees use carbon dioxide and give oxygen
Explanation: Through photosynthesis, trees absorb CO₂ and release oxygen.
6. Which of these is a mixture?
a) Salt
b) Air
c) Water
d) Gold
Answer: b) Air
Explanation: Air is a mixture of gases like nitrogen, oxygen, and carbon dioxide.

2. 7. When you touch a metal spoon in hot soup, the spoon gets hot. Why?
a) Radiation
b) Convection
c) Conduction
d) Expansion
Answer: c) Conduction
Explanation: Heat transfers through solids like metal by conduction.
8. In a food chain, what do producers do?
a) Eat other animals
b) Decompose waste
c) Make their own food
d) Store sunlight
Answer: c) Make their own food
Explanation: Producers, like green plants, make food through photosynthesis.
9. How does sound travel from one place to another?
a) Through light rays
b) Through solid objects only
c) Through vibrations in matter
d) Through empty space
Answer: c) Through vibrations in matter
Explanation: Sound travels as vibrations through solids, liquids, or gases, but not in a vacuum.
10. Which part of the cell controls its activities?
a) Cell wall
b) Mitochondria
c) Nucleus
d) Cytoplasm
Answer: c) Nucleus
Explanation: The nucleus is the "control center" of the cell, containing DNA and regulating functions.
MODERATE
1.Which of the following best describes the function of red blood cells?
a) Fight infections
b) Carry oxygen to body tissues
c) Control body temperature
d) Break down food
Answer: b) Carry oxygen to body tissues
Explanation: Red blood cells contain hemoglobin, which carries oxygen from the lungs to cells.
2. What happens to the particles in a liquid when it turns into a gas?
a) They stop moving
b) They move slower
c) They move faster and spread out
d) They shrink in size
Answer: c) They move faster and spread out
Explanation: As temperature increases, particles gain energy and move apart in the gas phase.

3. 3. What will most likely happen if the number of predators in an ecosystem suddenly increases?
a) The prey population will increase
b) The predator population will decrease
c) The prey population will decrease
d) The ecosystem will stay the same
Answer: c) The prey population will decrease
Explanation: More predators usually result in more prey being eaten, decreasing prey numbers.
4. If a car is moving at a constant speed, what does this mean?
a) Its speed is increasing
b) Its direction is always changing
c) It is not moving
d) It covers equal distances in equal times
Answer: d) It covers equal distances in equal times
Explanation: Constant speed means motion is steady without acceleration or deceleration.
5. Which of the following substances is likely to have a pH less than 7?
a) Soap
b) Vinegar
c) Water
d) Baking soda
Answer: b) Vinegar
Explanation: Vinegar is acidic and has a pH lower than 7.
6. Why does metal feel colder than wood at the same room temperature?
a) Metal is heavier
b) Metal reflects light
c) Metal conducts heat away from your hand faster
d) Metal absorbs less air
Answer: c) Metal conducts heat away from your hand faster
Explanation: Metal is a good conductor of heat, drawing warmth from your skin quickly.
7. Burning paper is an example of what kind of change?
a) Physical change
b) Reversible change
c) Chemical change
d) State change
Answer: c) Chemical change
Explanation: Burning creates new substances like ash and gases, making it chemical and irreversible.
8. Biology – Human Body Systems
Which body system is responsible for transporting nutrients and oxygen?
a) Nervous system
b) Digestive system
c) Circulatory system
d) Respiratory system
Answer: c) Circulatory system
Explanation: The circulatory system (heart, blood, and vessels) transports oxygen and nutrients.
9. Physics – Energy

4. What energy transformation occurs when you turn on a lamp?
a) Sound to light
b) Electrical to light
c) Light to chemical
d) Thermal to sound
Answer: b) Electrical to light
Explanation: A lamp converts electrical energy into light (and heat) energy.
10. Which of these is an example of a non-renewable resource?
a) Solar energy
b) Wind energy
c) Coal
d) Water
Answer: c) Coal
Explanation: Coal forms over millions of years and cannot be replaced quickly, making it non-renewable.
HARD
1.What is the process by which green plants convert sunlight into chemical energy?
Answer: Photosynthesis
Explanation: Plants use sunlight, carbon dioxide, and water to produce glucose and oxygen through photosynthesis.
2. What is the term for the force that opposes the motion of an object when it is in contact with another surface?
Answer: Friction
Explanation: Friction slows down or stops motion when two surfaces rub against each other.
3.What is the name of the layer of gases that surrounds the Earth and makes life possible by trapping heat and blocking
harmful radiation?
Answer: Atmosphere
Explanation: The atmosphere contains oxygen, carbon dioxide, and protects life by regulating temperature and blocking
UV rays.
4.What organelle in a plant cell is responsible for capturing sunlight for photosynthesis?
Answer: Chloroplast
Explanation: Chloroplasts contain chlorophyll and carry out photosynthesis.
5. What do you call the bending of light as it passes from one medium to another?
Answer: Refraction
Explanation: Light changes speed and direction when it enters a medium with a different density, like air to water.
6. What is the name of the diagram that shows how energy flows from one organism to another in an ecosystem?
Answer: Food chain
Explanation: A food chain illustrates the transfer of energy through different trophic levels.
7. What gas do animals exhale that plants use during photosynthesis?
Answer: Carbon dioxide
Explanation: Animals release carbon dioxide, which plants absorb for photosynthesis.

5. 8. What scientific principle explains why objects float in water depending on their density compared to the fluid?
Answer: Buoyancy
Explanation: An object will float if its density is less than the fluid; buoyant force acts upward.
9.What do you call the part of Earth where all living things exist, including land, water, and air?
Answer: Biosphere
Explanation: The biosphere includes all ecosystems and living organisms on Earth.
10. What is the smallest unit of life that can carry out all life processes?
Answer: Cell
Explanation: The cell is the basic structural and functional unit of all living organisms.
EXTRA QUESTIONS
11. What is the process by which liquid water turns into water vapor due to heat?
Answer: Evaporation
Explanation: Evaporation is the change from liquid to gas at the surface of a liquid.
12. What type of energy is stored in food and released during digestion and respiration?
Answer: Chemical energy
Explanation: Food contains chemical energy that the body converts to usable energy through metabolism.
13. What is the name of the process where heat is transferred through fluids (liquids or gases) by the movement of
particles?
Answer: Convection
Explanation: Convection involves warm fluid rising and cool fluid sinking, forming a circulation pattern.
14. What is the process by which organisms with traits best suited to their environment survive and reproduce?
Answer: Natural selection
Explanation: Natural selection allows the best-adapted organisms to pass on their traits to future generations, leading to
evolution over time.
15. What is the term for a change in the genetic material of an organism that can be inherited?
Answer: Mutation
Explanation: A mutation is a change in DNA that can lead to variations in traits and may be beneficial, harmful, or
neutral.
16. What is the name of the boundary where two tectonic plates meet and interact?
Answer: Plate boundary
Explanation: Plate boundaries are zones of movement where geological events like earthquakes and volcanoes often
occur.
17.What unit is used to measure the frequency of a wave, such as sound or light?
Answer: Hertz (Hz)
Explanation: Hertz measures how many wave cycles occur in one second; higher frequency = higher pitch (in sound).
19. What is the scientific term for the ability of a substance to dissolve in another substance?
Answer: Solubility

6. Explanation: Solubility describes how well a solute (like sugar) can dissolve in a solvent (like water) under specific
conditions.
20. What is the name of the device that converts chemical energy into electrical energy in portable electronics like
smartphones?
Answer: Battery
Explanation: A battery stores chemical energy and converts it into electricity to power electronic devices.