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1997 · Q13Science & TechnologySpace Technology & Astronomyeasy

The tail of a comet is directed away from the sun because

  1. (a)as the comet rotates around the sun, the lighter mass of the comet is pushed away due to the centrifugal force alone
  2. (b)as the comet rotates, the lighter mass of the comet is attracted by some star situated in the direction of its tail
  3. (c)the radiation emitted by the sun exerts a radial pressure on the comet throwing its tail away from the sun
  4. (d)the tail of the comet always exists in the same orientation
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Official answer(c) the radiation emitted by the sun exerts a radial pressure on the comet throwing its tail away from the sun

2026 · Q71Science & TechnologySpace Technology & Astronomymoderate

Consider the following statements with regard to involvement of private entities in India’s space programme : 1. The Indian National Space Promotion and Authorisation Centre (IN-SPACe) is an autonomous agency formed to facilitate participation of private entities. 2. Agnikul Cosmos launched the world’s first flight using 3D-printed rocket engine. 3. Skyroot Aerospace has developed liquid fuel for GSLV. Which of the statements given above is/are correct ?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 2 only
  4. (d)1, 2 and 3
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Official answer(c) 1 and 2 only

2025 · Q94Science & TechnologySpace Technology & Astronomymoderate

GPS-Aided Geo Augmented Navigation (GAGAN) uses a system of ground stations to provide necessary augmentation. Which of the following statements is/are correct in respect of GAGAN? I. It is designed to provide additional accuracy and integrity. II. It will allow more uniform and high quality air traffic management. III. It will provide benefits only in aviation but not in other modes of transportation. Select the correct answer using the code given below.

  1. (a)I, II and III
  2. (b)II and III only
  3. (c)I only
  4. (d)I and II only
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Official answer(d) I and II only

2024 · Q32Science & TechnologySpace Technology & Astronomymoderate

Consider the following statements : Statement-I : Giant stars live much longer than dwarf stars. Statement-II : Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements ?

  1. (a)Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
  2. (b)Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
  3. (c)Statement-I is correct, but Statement-II is incorrect
  4. (d)Statement-I is incorrect, but Statement-II is correct
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Official answer(d) Statement-I is incorrect, but Statement-II is correct

2022 · Q40Science & TechnologySpace Technology & Astronomymoderate

If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth ? 1. GPS and navigation systems could fail. 2. Tsunamis could occur at equatorial regions. 3. Power grids could be damaged. 4. Intense auroras could occur over much of the Earth. 5. Forest fires could take place over much of the planet. 6. Orbits of the satellites could be disturbed. 7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted. Select the correct answer using the code given below :

  1. (a)1, 2, 4 and 5 only
  2. (b)2, 3, 5, 6 and 7 only
  3. (c)1, 3, 4, 6 and 7 only
  4. (d)1, 2, 3, 4, 5, 6 and 7
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Official answer(c) 1, 3, 4, 6 and 7 only