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Total Questions : 639 | Page 5 of 64 pages
Question 41. Why do we have a leap year every four years?
  1.    The length of a year is not an integer number of days
  2.    It is a convention
  3.    The revolution slows down a little once every four years
  4.    The Earth gets shifted out of orbit every four year
 Discuss Question
Answer: Option A. -> The length of a year is not an integer number of days
Answer: (a)
The number of days in a year is 365 days and 6 hours (It is not a complete day). Having years of 365 days makes the year too short.
To keep up with the real length of the year maintaining an integer number of days, an extra day is added every four years.
Question 42. The solar eclipse achieves totality only in limited geographical regions because
  1.    The trajectories of the earth around the sun and the moon around the earth are not perfect circles
  2.    Sun rays can reach most of the peripheral regions of shadow of the moon due to atmospheric refraction
  3.    The earth is not smooth flat surface, but has elevations and depressions
  4.    The size of the shadow of the moon on the earth is small as compared to the cross section of the earth
 Discuss Question
Answer: Option D. -> The size of the shadow of the moon on the earth is small as compared to the cross section of the earth
Answer: (d)
Question 43. Nearly 30% of the solar radiations return back to the space without contributing anything to the Earth’s surface temperature. This amount of radiation is known as
  1.    Earth’s albedo
  2.    mesopause
  3.    tropopause
  4.    Black body
 Discuss Question
Answer: Option A. -> Earth’s albedo
Answer: (a)Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space.
Question 44. Time Saturn takes to complete one revolution around the Sun
  1.    29.5 years
  2.    84 years
  3.    36 years
  4.    18.5 years
 Discuss Question
Answer: Option A. -> 29.5 years
Answer: (a)
Question 45. Which planet in our solar system is nearly as big as the earth ?
  1.    Venus
  2.    Pluto
  3.    Mars
  4.    Mercury
 Discuss Question
Answer: Option A. -> Venus
Answer: (a)Venus is often referred to as our sister planet because of similarities in size, mass, density and volume. It is believed that both planets share a common origin forming at the same time out of a condensing nebulosity around 4.5 billion years ago.
Question 46. Which of the following statements in regard to the galaxy is correct?
  1.    A galaxy is a huge system of billions of stars and clouds of dust and gases
  2.    A galaxy does not have a sun
  3.    Galaxy is found between the orbits of Mars and Jupiter
  4.    Numerous tiny bodies that move around the sun are called galaxies
 Discuss Question
Answer: Option A. -> A galaxy is a huge system of billions of stars and clouds of dust and gases
Answer: (a)A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a super massive black hole in the middle.
Question 47. The group of stars arranged in a definite pattern is called
  1.    Andromeda
  2.    Solar system
  3.    Constellation
  4.    Milky way
 Discuss Question
Answer: Option C. -> Constellation
Answer: (c) The group of stars arranged in a definite pattern is called constellation. In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, which are patterns formed by prominent stars within apparent proximity to one another on Earth’s night sky.
Question 48. The Space craft ‘Magellan’ was sent to
  1.    Mars
  2.    Venus
  3.    Saturn
  4.    Pluto
 Discuss Question
Answer: Option B. -> Venus
Answer: (b)
Question 49. Space between Earth and Moon is known as
  1.    Nebula
  2.    None of these
  3.    Fulalunar
  4.    Cislunar
 Discuss Question
Answer: Option D. -> Cislunar
Answer: (d)Space between Earth and Moon is known as Cislunar. Pertaining to the space between the earth and the orbit of the moon.
Question 50. The planet revolving east to west is
  1.    Neptune
  2.    Pluto
  3.    Uranus
  4.    Venus
 Discuss Question
Answer: Option D. -> Venus
Answer: (d)Like the other planets in our solar system, Venus rotates about its axis. However, Venus is the only planet that rotates from east to west instead of west to east. This means, that if we lived on Venus, the Sun would appear to rise in the west in the morning, and set in the east in the evening. Venus rotates in what is called retrograde motion.

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