Space Part-4

Total Questions: 36

1. The atmosphere of Saturn contains which one of the following gas in large quantity? [U.P. P.C.S. (Pre) 2022]

(a) Carbon monoxide
(b) Nitrogen
(c) Sulphur dioxide
(d) Methane

Correct Answer: (d) Methane

Solution:Saturn is the sixth planet from the Sun and the second-largest planet in our Solar System. Saturn contains approximately 75% hydrogen and 25% helium with traces of other substances like methane, ammonia, water ice etc. Hence, among the given options, option (d) is the most appropriate answer.

2. Which of the following planets has the least density? [67th B.P.S.C. (Pre) 2022]

Correct Answer: (d) Saturn

Solution:

Saturn has the least density among all planets of our Solar system.

Planet	Average Density (gm/cm³ )
Earth	5.5
Mercury	5.4
Venus	5.2
Mars	3.9
Neptune	1.6
Jupiter	1.3
Uranus	1.3
Saturn	0.7

3. The fuel tanks of the spacecraft 'Discovery' that was launched into space on July 4, 2006 was filled with - [U.P.P.C.S. (Pre) 2006]

(a) Liquid hydrogen only
(b) Liquid oxygen only
(c) Mixture of liquid hydrogen and liquid oxygen
(d) Mixture of liquid hydrogen, liquid oxygen, and liquid helium

Correct Answer: (c) Mixture of liquid hydrogen and liquid oxygen

Solution:The Space Shuttle is a reusable spacecraft that takes off like a rocket, orbits the earth like a satellite and then lands like a glider. The space shuttle was made up of three main parts. The orbiter, the external tank and the solid rocket booster. These shuttles are fuelled with liquid hydrogen and liquid oxygen. Challenger, Columbia, Discovery, Atlantis and Endeavour are the space shuttles of NASA, but all of these are retired.

4. Apollo-8 was launched for space exploration on : [U.P.P.C.S. (Pre) 1999]

Correct Answer: (e) December 21, 1968

Solution:Apollo-8 was the first mission to take humans to the moon and back. It was launched from Cape Kennedy, Florida, the United States on December 21, 1968.

5. Selene-1, the lunar orbiter mission belongs to which one of the following? [I.A.S. (Pre) 2008]

(a) China
(b) European Union
(c) Japan
(d) USA

Correct Answer: (c) Japan

Solution:Selene-1 is Japan’s first lunar orbiter, which was launched on September 14, 2007. The orbiter’s nickname Kaguya was selected by the general public.

6. Consider the following statements in respect of a jet engine and a rocket: [I.A.S. (Pre) 2008, U.P.P.C.S. (Pre) 2009, U.P.P.C.S. (Mains) 2007]

A jet engine uses the surrounding air for its oxygen supply and so is unsuitable for motion in space.
A rocket carries its own supply of oxygen in the gas form and fuel.

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

Correct Answer: (c) Both 1 and 2

Solution:Jet engines and rockets work on the same principle. They produce thrust through an internal pressure difference as explained by Newton's third law of motion, eject exhaust gases in an equal and opposite direction. The main difference between them is that a Jet gets the oxygen for its supply of oxygen from the air while a rocket carries its own supply of oxygen (oxidiser) and fuel in the form of liquid or solid propellants which allows it to operate in space.

7. The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation? [I.A.S. (Pre) 2011 , U.P.P.C.S. (Mains) 2013]

There are no clouds or water-vapour in the lower stratosphere.
There are no vertical winds in the lower stratosphere.

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

Correct Answer: (c) Both 1 and 2

Solution:Jet spacecraft’s efficiently managed fuel combustion at low temperature in the stratosphere. The type of turbulence caused by convection heating that causes thunderstorms does not occur in the stratosphere. There are no clouds or water vapour and also no vertical winds in the lower stratosphere.

8. On which principle, a Jet Engine works? [U.P.R.O/A.R.O. (Mains) 2013]

(a) Conservation of linear momentum.
(b) Conservation of angular momentum.
(c) Conservation of energy.
(d) Conservation of mass.

Correct Answer: (a) Conservation of linear momentum.

Solution:Nearly all modern airplanes use jet propulsion to fly. Jet engines and rockets work on the principle of conservation of linear momentum.

9. Rocket works on the principle of the following: [U.P.P.C.S. (Mains) 2014, U.P.R.O/A.R.O. (Mains) 2013, U.P.R.O/A.R.O. (Pre) 2013]

(a) Bernoulli’s theorem
(b) Energy conservation
(c) Conservation of Momentum
(d) Avogadro’s concept

Correct Answer: (c) Conservation of Momentum

Solution:An electric rocket engine is a jet engine in which material ejected backward (ionized gas in general) causes a forward thrust motion. The principle (of the conservation of momentum). The linear momentum (p) or simply momentum of a particle is the product of its mass and its velocity [p = mv].

10. Stratellite is the: [U.P.R.O/A.R.O. (Pre) 2016]

(a) Uppermost band of stratosphere.
(b) Lowermost band of stratosphere.
(c) High altitude airship positioned in the stratosphere.
(d) Natural satellite of Saturn.

Correct Answer: (c) High altitude airship positioned in the stratosphere.

Solution:Stratellite is the high altitude airship positioned in the stratosphere and carries one or more repeaters to create wireless communication networks. A stratellite is similar to a satellite, but is stationed in the stratosphere rather than in the orbit.

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