Tag: launching vehicles

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Multiple choice physics satellite launch vehicles rocket propellants universe and space science xx radio telescope and space telescopes launching vehicles

Blow a balloon and let it go. You will find it moving in the direction opposite to the direction in which the air is ejected. This demonstrates :

  1. the principle of rocket propulsion

  2. the principle of combustion

  3. the principle of conservation of energy

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The principle of rocket propulsion works on the 'Newton's Third Law of Motion'. It states that, 'to every action, there is always an equal and opposite reaction'.

In the case of a rocket, the engine emits hot burning gases in the downward direction. These gases apply an equal and opposite reaction force to the rocket in the upward direction.
This is how a rocket is propelled.
Rocket propulsion is similar to the example of the situation in which, if we blow a balloon and let it go, it starts moving in the direction opposite to the direction in which the air is ejected. 
Balloon forces out the air inside it. The air applies an equal and opposite reaction force to the balloon.

Multiple choice physics satellite launch vehicles rocket propellants universe and space science xx radio telescope and space telescopes launching vehicles

The scientific instrument which is usually placed in the front region of the rocket is called :

  1. PAYBOOK

  2. PLAYOAD

  3. PAYLOAD

  4. PLAYWOOD
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The scientific instrument placed in the front region of the rocket is called PAYLOAD. For a rocket payload can be a satellite, space probe or a space craft carrying humans. The fraction of payload to the total liftoff weight of the rocket iscalled as palyload friction.

Multiple choice physics satellite launch vehicles rocket propellants universe and space science xx radio telescope and space telescopes launching vehicles

The principle of rocket propulsion depends on :

  1. Newton's third law of motion

  2. Principle of conservation of momentum

  3. Either A and B

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The principle of rocket propulsion works on the 'Newton's Third Law of Motion'. It states that, 'to every action, there is always an equal and opposite reaction'.

In the case of a rocket, the engine emits hot burning gases in the downward direction. These gases apply an equal and opposite reaction force to the rocket in the upward direction.
This is how a rocket is propelled.
The principle of conservation of momentum states that whenever two bodies collide or get separated, then their  total momentum before collision or separation is equal to their total momentum after collision or separation.
Since the gases of the rocket and the rocket are stationery at the start, their total momentum is zero. After the gases start burning, the momentum imparted to the rocket is equal and opposite to that of the gases. Hence their total momentum is zero.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Which of the following is not a fact about Hubble Telescope?

  1. The Hubble Space Telescopes captures and transmits colorful images of objects in space such as dying stars and other galaxies.

  2. Although the Hubble Space Telescope can observe many things in space, it cannot observe the Sun or Mercury.

  3. The Hubble Space Telescope orbits about 353 miles above Earth

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the facts mentioned about Hubble Telescope are true. The Hubble Telescope orbits 353 miles above earth and transmits colorful images of objects in space and through Hubble telescope we can observe many things in space except the sun or mercury.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Which of the following is not a part of HST?

  1. Advanced Camera for Surveys (ACS).

  2. Faint Object Camera (FOC)

  3. Computer-controlled polishing machines

  4. Faint Object Spectrograph (FOS).
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Computer-controlled polishiing machines is not a part of HST. This is used mostly in fabrication purposes. In fabrication process automation techniques like computer-controlled polishing is used to achieve high level of fabrication.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

DSN is a deep space network tracking station is 

  1. to track and communicate with interplanetary spacecraft missions.

  2. to track and provide the fuel to the spacecraft.

  3. to maintain the spacecraft

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DNS is a deep space network tracking station use to track and  communicate with interplanetary spacecraft missions, Along with tacking and communication DSN is also used to explore the furthest point of our solar system.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Which of the following is an early drawback of HST?

  1. Its ground control system.

  2. Hubble failed to achieve a final sharp focus and the best image quality obtained was drastically lower.

  3. Images of point sources spread out over a radius of more than one arcsecond.

  4. All of the above
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

As the early drawback of Hubble space telescope, Hubble filed to achieve a final sharp focus and the best image quality obtained was drastically lower. Also the image of point sources spread out over a radius of more than one arc second.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Which of the following is correct statement regarding HST?

  1. The Hubble Space Telescope (HST) , has accurately determined the rate of expansion of the universe.

  2. Hubble has contributed to studies of the behavior of graphite composite structures in vacuum.

  3. Optical contamination from residual gas can also be observed from the HST.

  4. none of the above
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The hubble space Telescope (HST) has accurately determined rate of expansion of the universe. It has contributed to studies of the behaviour of graphite composite structures in vacuum and has observed the optical contamination from residual gases.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

The Hubble Space Telescope is scheduled to retire in which of the following year?

  1. 2012

  2. 2013

  3. 2014

  4. 2015
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Hubble space telescope was launched in 1990 to observe stellar objects It has gathered spectacular images and has helped advanced knowledge in the field of cosmology. After it immense contribution it retired in the year 2014.