Space (Physics) Part-IV

Total Questions: 21

1. Which of the following is not used as rocket propellant- [U.P.P.S.C. (GIC) 2010]

Correct Answer: (b) Liquid oxygen
Solution:

Among the given options, all are used as rocket propellant. Liquid hydrogen, liquid hydrazine and kerosene oil are used as fuel while liquid oxygen is used as oxidiser in rocket propellant. Propellant is a mixture of fuel and oxidiser.

2. The Bharat Electronics Ltd. (BEL) is collaborating with ISRO to develop: [R.A.S./R.T.S. (Pre) 2018]

Correct Answer: (b) GaAs solar cells
Solution:

Among the given options, Bharat Electronics Ltd. (BEL) is collaborating with ISRO to develop GaAs (Gallium Arsenide) solar cells. These solar cells for space are more advanced in terms of technology and efficient in order to produce electricity in the space which would eventually help in the longevity of the Indian satellites.

3. Consider the following statements: [I.A.S. (Pre) 2007]

1. In the year 2006, India successfully tested a full-fledged cryogenic stage in rocketry.

2. After USA, Russia, and China, India is the only country to have acquired the capability for use of cryogenic stage in rocketry.

Which of the statements given above is/are correct?

Correct Answer: (a) 1 only
Solution:

India has become the sixth member of the exclusive club to have developed a cryogenic stage in rocketry with USA, Russia, European space agency, China, and Japan, after successfully testing a full-fledged cryogenic stage for 50 seconds at the Liquid Propulsion Systems Centre (LPSC) in Tirunelveli. Tamil Nadu in October, 2006.

4. Consider the following statements and find the correct answer from the codes given below: [U.P.P.C.S. (Mains) 2008]

1. RISAT-2 Satellite was put in orbit by PSLV-C12 in April 2009 from Sriharikota.

2. Another satellite ANUSAT was also put in orbit by the PSLV-C12. This was built by Anna University, Chennai.

3. ANUSAT is an experimental communication satellite.

4. RISAT-2 is surveillance satellite and can keep a watch on country's borders.

Code:

Correct Answer: (d) 1, 2, 3, and 4 all
Solution:

RISAT-2 or Radar Imaging Satellite-2 is an Indian radar reconnaissance satellite. It was successfully launched by PSLV-C12 rocket on 20 April, 2009 from Satish Dhawan Space Centre, Sriharikota. It was designed to monitor India's border.

ANUSAT is an experimental communication satellite designed and developed by Anna University, Chennai. It was successfully launched aboard PSLV-C12 along with RISAT-2 from the same place.

5. With reference to Indian satellites and their launchers, consider the following statements: [I.A.S. (Pre) 2002]

1. All the INSAT series of satellites were launched abroad.

2. PSLVs were used to launch IRS-series of satellites.

3. India used the indigenously built cryogenic engines for the first time for powering the third stage of GSLV.

4. GSAT, launched in the year 2001, had payloads to demonstrate digital broadcast and internet services.

Which of these statements are correct?

Correct Answer: (b) 2, 3 and 4
Solution:

GSLV is a three-stage launcher, whose third stage used an indigenous- built cryogenic engines. This indigenous engine was built by Liquid Propulsion System Centre at Mahendragiri of Tamil Nadu. GSAT-1 satellite was launched on 18 April, 2001 which had payloads to demonstrate digital broadcasts and internet services.

PSLVs were used to launch IRS series of satellites and apart from this, it is also used to launch various other satellites. INSAT-4C was launched from Sriharikota on 10 July, 2006. So the statement 2, 3, and 4 are correct but 1 is false.

6. With reference to India's satellite launch vehicles, consider the following statements: [I.A.S. (Pre) 2018]

1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.

2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.

3. GSLV Mk III is a four-stage launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines.

Which of the statements given above is/are correct?

Correct Answer: (a) 1 only
Solution:

PSLV (Polar Satellite Launch Vehicle) is an indigenously developed expendable launch system of the ISRO. It comes in the category of medium-lift launchers with a reach up to various orbits, including the Geo Synchronous Transfer orbit, Lower Earth orbit and Polar Sun Synchronous orbit.

GSLV is also operated by ISRO. It is used to launch a satellite into Geo Synchronous Transfer orbit. The GSLV is designed mainly to deliver the communication satellites to the height of 36000 km. PSLV launches mainly the earth monitoring satellites to the Polar orbits and these satellites do not appear to fix in the same position in the sky.

GSLV Mk III (LVM3) is a three-stage launch vehicle the with first stage using a solid propellant, second stage using liquid propellant and the third stage is the cryogenic stage. Hence, only statement 1 is correct.

7. An artificial satellite can be tracked very precisely from the Earth by using: [U.P.P.C.S. (Pre) 2017]

Correct Answer: (a) Doppler effect
Solution:

An artificial satellite can be tracked very precisely from the Earth by using Doppler effect. It is done with the help of tracking transmitter. With the help of doppler effect, this tracking is possible.

8. Which one of the following is not a space satellite? [U.P.P.S.C. (GIC) 2010, U.P. Lower Sub. (Spl.) (Pre) 2004]

Correct Answer: (a) SLV-3
Solution:

Rohini is a series of satellites launched by the Indian Space Research Organisation. The Rohini series consist of four satellites, all of which were launched successfully by ISRO. RS-D1 was launched on 31 May, 1981.

IRS Satellites is a series of Indian Remote Sensing Satellite for earth's observation. IRS-ID was launched on 29 September, 1997. INSAT-2D satellite was launched on 4 June, 1997. SLV-3 is not a space satellite, it is a satellite launch vehicle which was developed by ISRO.

9. GSLV-D2 which has been recently launched into the orbit is- [U.P.U.D.A/L.D.A. (Pre) 2001]

Correct Answer: (c) Communication Satellite
Solution:

GSLV is India's indigenous satellite launch vehicle. It was primarily developed to launch INSAT class of satellites into geosynchronous transfer orbit.

GSLV-D2 was the second developmental test flight (8 May, 2003) of this vehicle. In this flight GSLV had placed a heavier satellite, the 1800 kg GSAT-2 into geosynchronous transfer orbit.

10. Consider the following statements:- [I.A.S. (Pre) 2005]

1. Vigyan Rail is a Science Exhibition on wheels organized by the Council of Scientific and Industrial Research.

2. Vigyan Prasar is an autonomous body under the ministry of human resources development.

3. The educational satellite of ISRO (EDUSAT) was launched in 2004 from French Guiana.

Which of the above statement is correct

Correct Answer: (d) None of the above
Solution:

Vigyan Rail is a science exhibition on the wheels organized jointly by Ministry of Railway and the Department of Science and Technology. It was started on 15 December, 2003 for depicting India's achievements in various fields of science and technology. Therefore Statement 1 is false.

Vigyan Prasar is an autonomous organization under the Department of Science and Technology not under the Ministry of Human Resources and Development. It was established in the year 1989. So statement 2 is also false.

EDUSAT is the satellite exclusively devoted to meet the demands of the education sector. It was launched on 20 September, 2004 from Satish Dhawan Space Centre, Sriharikota, Andhra Pradesh not from French Guiana. Eventually, the Statement 3 is also false.