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MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. About how many stars are visible to the naked eye on a clear, dark night away from city lights?
  1.    a few dozen
  2.    a couple thousand
  3.    several million
  4.    a few hundred billion
 Discuss Question
Answer: Option B. -> a couple thousand
:
B
Question 12. What conditions are required for a lunar eclipse?
  1.    The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
  2.    The phase of the Moon must be full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
  3.    The phase of the Moon can be new or full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
  4.    The phase of the Moon must be new, and the Moon's orbital plane must lie in the ecliptic.
 Discuss Question
Answer: Option B. -> The phase of the Moon must be full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
:
B
Question 13. What happens during the apparent retrograde motion of a planet?
  1.    The planet rises in the west and sets in the east.
  2.    The planet appears to move eastward with respect to the stars over a period of many nights.
  3.    The planet moves backward through the sky.
  4.    The planet moves backward in its orbit around the Sun.
 Discuss Question
Answer: Option B. -> The planet appears to move eastward with respect to the stars over a period of many nights.
:
B
Question 14. The greenhouse effect is caused primarily by:
  1.    ozone destroying aerosol sprays
  2.    water vapour
  3.    carbon di-oxide
  4.    Factories & automobile fumes
 Discuss Question
Answer: Option D. -> Factories & automobile fumes
:
D
Question 15. Which of the following is a prime health risks associated with greater UV radiation through the atmosphere due to depletion of stratospheric ozone?
  1.    Neurological disorder
  2.    Increased skin cancer
  3.    Damage to digestive system
  4.    Damage to eyes
 Discuss Question
Answer: Option B. -> Increased skin cancer
:
B
Question 16. Which of the following is not a primary contributor to the greenhouse effect?
  1.    carbon mono-oxide
  2.    nitrous oxide
  3.    chlorofluorocarbons
  4.    Water vapour
 Discuss Question
Answer: Option C. -> chlorofluorocarbons
:
C
Question 17. Acid rain is formed due to contribution from the following pair of gases.
  1.    Oxygen and nitrous oxide
  2.    methane and sulphur dioxide
  3.    Carbon dioxide and sulphur dioxide
  4.    Methane and carbon dioxide
 Discuss Question
Answer: Option A. -> Oxygen and nitrous oxide
:
A
Question 18. Which of the following is not as a consequence of global warming?
  1.    worsening health effects
  2.    increased agricultural productivity worldwide
  3.    peptides into amino acids
  4.    Increasing incidents of skin cancer
 Discuss Question
Answer: Option B. -> increased agricultural productivity worldwide
:
B
Question 19. What is the harm from the depletion of Earth ozone layer
  1.    The average temperature of earths surface will increase gradually
  2.    Increased amount of Ultra violet radiation will reach earths surface
  3.    Sea levels will rise as the polar ice caps will gradually melt
  4.    Rivers will have continuous flooding
 Discuss Question
Answer: Option B. -> Increased amount of Ultra violet radiation will reach earths surface
:
B
Question 20. The main cause of global warming is:
  1.    pollution from factories and automobiles
  2.    orbital eccentricities of earth & variations in the sun output
  3.    the greenhouse effect
  4.    Depletion in green cover
 Discuss Question
Answer: Option A. -> pollution from factories and automobiles
:
A

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