MCQs on The Sun – Geography
Q1. What is the primary source of the Sun’s energy?
a) Burning of hydrogen
b) Fission reactions involving hydrogen
c) Fusion reactions involving hydrogen
d) Some other source
Show Answer
Correct Answer: c) Fusion reactions involving hydrogen
Explanation: The Sun’s energy is primarily generated through nuclear fusion reactions involving hydrogen.
Q2. What is the approximate diameter of the Sun?
a) 1.39 x 10^7 km
b) 1.9 x 10^6 km
c) 1.39 x 10^6 km
d) 1.39 x 10^16 km
Show Answer
Correct Answer: c) 1.39 x 10^6 km
Explanation: The diameter of the Sun is approximately 1.39 x 10^6 km.
Q3. What is the temperature of the Sun’s photosphere?
a) 15 million K
b) 5,800 K
c) 90,000 K
d) 12,540 K
Show Answer
Correct Answer: b) 5,800 K
Explanation: The temperature of the Sun’s photosphere is about 5,800 K.
Q4. Which layer of the Sun is visible during a solar eclipse?
a) Photosphere
b) Corona
c) Chromosphere
d) Core
Show Answer
Correct Answer: b) Corona
Explanation: The Sun’s outer atmosphere, the corona, is visible during a solar eclipse.
Q5. What is the time taken by the light of the Sun to reach the Earth?
a) 8 minutes 10 seconds
b) 8 minutes 20 seconds
c) 8 minutes 30 seconds
d) 7 minutes 16 seconds
Show Answer
Correct Answer: b) 8 minutes 20 seconds
Explanation: The light of the Sun takes approximately 8 minutes and 20 seconds to reach the Earth.
Q6. Which planet is closest to the Sun?
a) Jupiter
b) Mercury
c) Neptune
d) Earth
Show Answer
Correct Answer: b) Mercury
Explanation: Mercury is the closest planet to the Sun.
Q7. Which layer of the Sun is responsible for generating most of its energy through nuclear fusion?
a) Core
b) Radiation zone
c) Photosphere
d) Corona
Show Answer
Correct Answer: a) Core
Explanation: The Sun’s core is responsible for generating most of its energy through nuclear fusion.
Q8. What is the outermost layer of the Sun’s atmosphere called?
a) Photosphere
b) Chromosphere
c) Corona
d) Core
Show Answer
Correct Answer: c) Corona
Explanation: The outermost layer of the Sun’s atmosphere is called the corona.
Q9. Which of the following is NOT a layer of the Sun?
a) Photosphere
b) Chromosphere
c) Ionosphere
d) Corona
Show Answer
Correct Answer: c) Ionosphere
Explanation: The ionosphere is not a layer of the Sun; it is a part of Earth’s atmosphere.
Q10. What is the name of the process that occurs in the Sun’s core, generating its energy?
a) Nuclear fission
b) Nuclear fusion
c) Radioactive decay
d) Gravitational collapse
Show Answer
Correct Answer: b) Nuclear fusion
Explanation: The Sun’s energy is generated through nuclear fusion in its core.
Q11. Which of the following is the smallest planet in the Solar System?
a) Mercury
b) Jupiter
c) Venus
d) Saturn
Show Answer
Correct Answer: a) Mercury
Explanation: Mercury is the smallest planet in the Solar System.
Q12. What is the approximate distance between the Earth and the Sun?
a) 93 million miles
b) 150 million kilometers
c) Both a and b
d) None of the above
Show Answer
Correct Answer: c) Both a and b
Explanation: The approximate distance between the Earth and the Sun is 93 million miles or 150 million kilometers.
Q13. Which of the following is the brightest planet in the night sky?
a) Jupiter
b) Venus
c) Mars
d) Saturn
Show Answer
Correct Answer: b) Venus
Explanation: Venus is the brightest planet in the night sky.
Q14. What is the name of the phenomenon when the Moon passes directly in front of the Sun, casting a shadow on a portion of Earth?
a) Lunar eclipse
b) Solar eclipse
c) Transit
d) Occultation
Show Answer
Correct Answer: b) Solar eclipse
Explanation: A solar eclipse occurs when the Moon passes directly in front of the Sun, casting a shadow on a portion of Earth.
Q15. Which city in the United States has the highest average percentage of sunny days per year?
a) Phoenix, Arizona
b) Yuma, Arizona
c) Las Vegas, Nevada
d) Miami, Florida
Show Answer
Correct Answer: b) Yuma, Arizona
Explanation: Yuma, Arizona has a yearly average of 90% of sunny days, making it the city with the highest average percentage of sunny days per year in the United States.
Q16. What is the name of the region in the Sun where energy is transferred by convection?
a) Core
b) Radiation zone
c) Convection zone
d) Photosphere
Show Answer
Correct Answer: c) Convection zone
Explanation: The convection zone is the region in the Sun where energy is transferred by convection.
Q17. What is the name of the thin region of the Sun that is 10000 km thick?
a) Photosphere
b) Chromosphere
c) Corona
d) Convection zone
Show Answer
Correct Answer: b) Chromosphere
Explanation: The chromosphere is a thin region of the Sun that is 10000 km thick.
Q18. What is the name of the region in the Sun where energy is transferred by radiation?
a) Core
b) Radiation zone
c) Convection zone
d) Photosphere
Show Answer
Correct Answer: b) Radiation zone
Explanation: The radiation zone is the region in the Sun where energy is transferred by radiation.
Q19. What percentage of the Sun’s radiated energy is in the visible region?
a) 43%
b) 45%
c) 47%
d) 50%
Show Answer
Correct Answer: a) 43%
Explanation: Approximately 43% of the Sun’s radiated energy is in the visible region.
Q20. What is the value of the solar constant?
a) 1637 W/m^2
b) 1367 W/m^2
c) 136 W/m^2
d) 3167 W/m^2
Show Answer
Correct Answer: b) 1367 W/m^2
Explanation: The solar constant is approximately 1367 W/m^2, which represents the amount of solar energy received per unit area on a surface perpendicular to the Sun’s rays at the mean distance between the Earth and the Sun.