10th class Physics, Chapter 21: Space and Environment MCQs

1. What process generates energy in the Sun?

1. (A) Nuclear fission
2. (B) Nuclear fusion ✓
3. (C) Radioactive decay
4. (D) Chemical reactions

2. The factor which primarily determines a planet's surface temperature:

1. (A) its density
2. (B) its orbital distance from the Sun ✓
3. (C) its gravitational field strength
4. (D) the number of moons it has

3. What is the primary reason cyclones form over warm ocean waters?

1. (A) The presence of strong winds
2. (B) The high atmospheric pressure
3. (C) The rising of warm, moist air creating low pressure ✓
4. (D) The gravitational pull of the moon

4. Which of the following gas contributes the most to global warming?

1. (A) Oxygen
2. (B) Carbon dioxide ✓
3. (C) Nitrogen
4. (D) Argon

5. How does the Coriolis effect influence cyclones?

1. (A) It causes cyclones to spin in opposite directions in different hemispheres ✓
2. (B) It strengthens cyclones over land
3. (C) It prevents warm air from rising
4. (D) It stops the formation of low-pressure areas

6. A major cause of rising sea levels is:

1. (A) increased volcanic activity
2. (B) the Earth moving closer to the Sun
3. (C) melting glaciers and ice sheets ✓
4. (D) decreased solar radiation

7. A significant source of background radiation is:

1. (A) oxygen in the air
2. (B) cosmic rays from space ✓
3. (C) sound waves in the atmosphere
4. (D) light from the Sun

8. The Sun consists mostly of:

1. (A) hydrogen and helium ✓
2. (B) oxygen and nitrogen
3. (C) carbon and iron
4. (D) helium and neon

9. Planets closer to the Sun have:

1. (A) no orbital period
2. (B) shorter orbital periods ✓
3. (C) longer orbital periods
4. (D) the same orbital period

10. The orbital period of the Earth is:

1. (A) 165 years
2. (B) 30 days
3. (C) 365.25 days ✓
4. (D) 88 days

11. Which planet has an extremely high surface temperature due to its thick, heat-trapping atmosphere?

1. (A) Mercury
2. (B) Venus ✓
3. (C) Mars
4. (D) Neptune

12. Compared with the Earth, the gravitational field strength at the surface of Jupiter is:

1. (A) stronger ✓
2. (B) weaker
3. (C) the same
4. (D) zero

13. Cyclones form over oceans where the sea surface temperature is about:

1. (A) 27 °C ✓
2. (B) 10 °C
3. (C) 0 °C
4. (D) 100 °C

14. The most dangerous part of a cyclone is the:

1. (A) eye
2. (B) outer edge
3. (C) centre of the eye
4. (D) eye wall ✓

15. In the northern hemisphere, the air in a cyclone spins:

1. (A) clockwise
2. (B) straight
3. (C) randomly
4. (D) anticlockwise ✓

16. In the southern hemisphere, the air in a cyclone spins:

1. (A) clockwise ✓
2. (B) anticlockwise
3. (C) straight
4. (D) randomly

17. Which of the following is NOT a cause of global warming?

1. (A) Planting trees ✓
2. (B) Burning of fossil fuels
3. (C) Cutting down forests
4. (D) Release of methane

18. Cities are hotter during heat waves because:

1. (A) there are more trees
2. (B) there is more water
3. (C) there is less sunlight
4. (D) buildings and roads absorb and retain heat ✓

19. Which of the following is a greenhouse gas?

1. (A) Oxygen
2. (B) Nitrogen
3. (C) Argon
4. (D) Carbon dioxide ✓

20. Global warming has the following effect on the weather:

1. (A) less rainfall everywhere
2. (B) permanent winter
3. (C) more extreme weather events ✓
4. (D) no change