• INDIAN POLITY FOR CIVIL SERVICES EXAMINATIONS
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Space Technology

  1. Solar System
  2. Remote Sensing
  3. Satellites and Rocket Technology

[2011 Prelims]

1)Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when: 
1. The orbit is geosynchronous. 
2. The orbit is circular. 
3. The orbit lies in the plane of the Earth’s equator. 
4. The orbit is at an altitude of 22,236 km. 

Select the correct answer using the codes given below: 

(a) 1,2 and 3 only
(b) 1,3 and 4 only 
(c) 2 and 4 Only
(d) 1,2, 3 and 4

2)An artificial satellite orbiting around the earth does not fall down. This is so because the attraction of earth ?

(a)    Does not exist at such distance.

(b)    Is neutralized by the attraction of the moon.

(c)    Provides the necessary speed for its steady motion.

(d)    Provides the necessary acceleration for its motion.

3)What is the difference between asteroids and comets ?

  1. Asteroids are small rocky plane-toids, while comets are formed of frozen gases held together by rocky and metallic material.
  2. Asteroids are found mostly between the orbits of Jupiter and mars, while comets are found mostly between Venus and mercury.
  3. Comets show a perceptible  glowing  tail, while asteroids do not.

Which of the statements given above is/are correct ?

(a)    1 and 2 only.

(b)    1 and 3 only.

(c)    3 only.

(d)    1,2 and 3.

3)A layer in the earth’s  atmosphere called ionosphere facilities  radio communication. Why ?

  1. Why presence of ozone causes the reflection of radio waves to earth.
  2. Radio waves have a very long wavelength.

Which of the statements given above is/are correct  ?

(a)    1 only.

(b)    2 only.

(c)    Both 1 and 2.

(d)    Neither 1 nor 2.

[2012 Prelims]

1)Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?

[A]The Earth’s magnetic field diverts them towards its poles

[B]Ozone layer around the Earth reflects them back to outer space

[C]Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth

[D]None of the statements (a), (b) and (e) given above is correct

[2014 Prelims]

1)Which of the following pair is/are correctly matched?

Spacecraft                    Purpose

  1. Cassini-Huygens        : Orbiting the Venus and transmitting data to the Earth
  2. Messenger                : Mapping and investigating the Mercury
  3. Voyager 1 and 2        : Exploring the outer solar system

Select the correct answer using the code given below.

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

[2015 Prelims]

1)In which of the following activities are Indian Remote Sensing (IRS) satellites used?

  1. Assessment of crop productivity
  2. Locating groundwater resources
  3. Mineral exploration
  4. Telecommunications
  5. Traffic studies

Select the correct answer using the code given below.

(a) 1, 2 and 3 only

(b) 4 and 5 only

(c) 1 and 2 only

(d) 1, 2, 3, 4 and 5

2)The term ‘Goldilocks Zone’ is often seen in the news in the context of

(a) the limits of habitable zone above the surface of the Earth

(b) regions inside the Earth where shale gas is available

(c) search for the Earth-like planets in outer space

(d) search for meteorites containing precious metals