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Six Class Exam

sceince

1. What is the basic unit of heredity in living organisms?

Cell

DNA

Gene

Chromosome

2. Which organelle is responsible for energy production in cells?

Nucleus

Mitochondria

Ribosome

Golgi Apparatus

3. What force opposes the motion of objects through the air?

Gravity

Friction

Air Resistance

Tension

4. Which layer of the atmosphere contains the ozone layer?

Troposphere

Stratosphere

Mesosphere

Thermosphere

5. What is the chemical formula for common table salt?

NaCl

KCl

NaOH

HCl

6. Which type of rock is formed from cooled magma or lava?

Sedimentary

Metamorphic

Igneous

Basalt

7. What is the main gas responsible for the greenhouse effect?

Oxygen

Nitrogen

Carbon Dioxide

Hydrogen

8. Which part of the brain controls balance and coordination?

Cerebrum

Cerebellum

Brainstem

Thalamus

9. What is the largest planet in our solar system?

Earth

Jupiter

Saturn

Neptune

10. What process do plants use to convert sunlight into chemical energy?

Respiration

Photosynthesis

Fermentation

Transpiration

11. What type of energy transformation occurs in a battery?

Chemical to Electrical

Electrical to Mechanical

Thermal to Chemical

Mechanical to Thermal

12. What element is the primary component of the sun?

Oxygen

Hydrogen

Carbon

Nitrogen

13. Which mineral is essential for strong bones and teeth?

Iron

Calcium

Potassium

Sodium

14. What causes the seasons on Earth?

Earth’s distance from the sun

Earth’s tilt on its axis

Earth’s rotation speed

Sun’s temperature changes

15. What type of bond involves the sharing of electron pairs between atoms?

Ionic

Covalent

Metallic

Hydrogen

16. Which natural disaster is measured by the Richter scale?

Tornado

Earthquake

Hurricane

Tsunami

17. What is the most abundant element in the Earth’s crust?

Iron

Silicon

Oxygen

Aluminum

18. What type of energy is stored in a stretched rubber band?

Kinetic

Thermal

Chemical

Potential

19.What is the process of water changing from liquid to gas?

Melting

Freezing

Evaporation

Condensation

20. What is the chemical formula for carbon dioxide?

CO

CO2

C2O

C2O2

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