Class 8 Science MCQs with Answers

1. c) Oxygen.

Oxygen is a non-metal element, while iron, copper, and silver are all metals.

2. a) Newton

Newton is the SI unit of force, named after Sir Isaac Newton, while joule, watt, and volt are units of energy, power, and electric potential difference, respectively.

3. c) Yellow

Yellow is not a primary color of light; the primary colors of light are red, green, and blue.

4. b) Pancreas

The pancreas is the organ responsible for producing insulin, which regulates blood sugar levels, while the liver, kidney, and heart perform other functions.

5. a) Au

Au is the chemical symbol for gold, derived from its Latin name “Aurum,” while Ag, Fe, and Hg are symbols for silver, iron, and mercury, respectively.

6. c) Solar Power

Solar power is a renewable source of energy derived from the sun, while coal, natural gas, and petroleum are non-renewable fossil fuels.

7. a) Condensation

Condensation is the process by which water vapor changes into liquid water, while evaporation, sublimation, and precipitation are other phase changes of water.

8. b) Crust

The Earth’s crust is the outermost layer of the Earth, while the mantle, core, and lithosphere are other layers of the Earth’s structure.

9. b) Burning of wood

Burning of wood is an example of a chemical change because it involves a chemical reaction that changes the composition of the wood, while melting of ice, cutting of paper, and stretching of rubber band are physical changes.

10. c) H2O

H2O is the chemical formula for water, while H2O2, CO2, and CH4 are the formulas for hydrogen peroxide, carbon dioxide, and methane, respectively.

11. c) Roots

Roots are the part of the plant responsible for absorbing water and minerals from the soil, while stems, leaves, and flowers serve other functions within the plant.

12. b) Cow

A herbivore is an animal that primarily consumes plants, and a cow is an example of a herbivore, while a lion, tiger, and snake are carnivores or omnivores.

13. a) Photosynthesis

Photosynthesis is the process by which green plants make their food using sunlight, carbon dioxide, and water, while respiration, transpiration, and fermentation are other physiological processes.

14. b) Ampere

Ampere is the SI unit of electric current, while volt, ohm, and watt are units of electric potential difference, resistance, and power, respectively.

15. a) Turns blue litmus paper red

Acids turn blue litmus paper red, while bases turn red litmus paper blue, and bitter taste and slippery feel are characteristics of bases.

16. b) Paleontology

Paleontology is the study of fossils, while ecology, botany, and zoology are other branches of science dealing with different aspects of the environment, plants, and animals.

17. b) Friction

Friction is the force that opposes the motion of objects through air or any medium, while gravity, tension, and inertia are other forces with different effects.

18. c) Carbon dioxide

Carbon dioxide is a greenhouse gas that contributes to global warming, while oxygen, nitrogen, and helium are other gases with different properties.

19. b) Evaporation

Evaporation is the process by which water changes from a liquid to a vapor state, while condensation, sublimation, and precipitation are other phase changes.

20. c) Meter

Meter is a unit of measurement for distance in the International System of Units (SI), while newton, joule, and kilogram are units of force, energy, and mass, respectively.

21. b) Control and coordination of body activities

The nervous system controls and coordinates body activities by transmitting electrical signals between different parts of the body, while the regulation of body temperature, transport of oxygen, and digestion of food are functions of other systems.

22. c) Mars

Mars is often referred to as the Red Planet due to its reddish appearance caused by iron oxide on its surface, while Earth, Jupiter, and Venus have different characteristics.

23. a) Methane

Methane is the main component of natural gas, while carbon dioxide, oxygen, and nitrogen are other gases found in the atmosphere with different compositions.

24. d) Freezing

Freezing is the process by which water changes from a liquid to a solid state, while condensation, evaporation, and sublimation are other phase changes.

25. b) Kelvin

Kelvin is the SI unit of temperature, while Celsius and Fahrenheit are other temperature scales used in different regions of the world, and Rankine is another unit of temperature measurement.