Tag: physics

Questions Related to physics

Which of the following measurements is most accurate?

physics units and measurement: error analysis accuracy of measurement accuracy and precision accuracy, precision and uncertainty in measurement

  1. $0.005 mm$

  2. $5.00 mm$

  3. $50.00 mm$

  4. $5.0 mm$

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Correct Option: C

Which is most accurate?

physics units and measurement: error analysis accuracy of measurement accuracy and precision accuracy, precision and uncertainty in measurement

  1. 3 m

  2. 3.0 m

  3. 3.00 m

  4. 3.000 m

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Correct Option: D
Explanation:

The one with more significant figures in the decimal is more accurate.
Option D.

The mathematical operation in which the accuracy is limited to least accurate term is :

physics units and measurement: error analysis accuracy of measurement accuracy and precision accuracy, precision and uncertainty in measurement

  1. addition

  2. subtraction

  3. multiplication and division

  4. both A and B

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Correct Option: D
Explanation:

In addition or subtraction we can reduce the terms to least accurate term and add or subtract them. By this process in addition or subtraction answer is not much get affected or change in answer is negligible.

But if we apply this process in multiplication and division, change in answer is considerable.
Hence in addition and subtraction accuracy is limited to least accurate term.

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

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  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

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Correct Option: D
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.

Which of the following is not a part of HST?

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

  1. Advanced Camera for Surveys (ACS).

  2. Faint Object Camera (FOC)

  3. Computer-controlled polishing machines

  4. Faint Object Spectrograph (FOS).

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Correct Option: C
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.

DSN is a deep space network tracking station is 

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

  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

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Correct Option: A
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.

Which of the following is an early drawback of HST?

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  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

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Correct Option: B,C
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.

Which of the following is correct statement regarding HST?

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

  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

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Correct Option: A,B,C
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.

What is the average speed of the Hubble telescope?

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

  1. 2 miles per second

  2. 10 miles per second

  3. 7 miles per second

  4. 5 miles per second

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Correct Option: D
Explanation:

The average speed of Hubble space telescope is $17000$ $mph$ or $5$ miles per second. Hubble space telescope takes 95 minutes to complete one orbit.

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

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  1. 2012

  2. 2013

  3. 2014

  4. 2015

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Correct Option: C
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.