General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

31. Which of the following has an effect on the value of acceleration due to gravity?

[A] Shape of the earth
[B] Height above the earth surface
[C] Axial rotation of the earth
[D] All of the above

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32. What do we call the minimum velocity with which a body must be projected up, so as to enable it to just overcome the gravitational pull?

[A] Orbital velocity
[B] Gravitational velocity
[C] Escape velocity
[D] None of the above

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33. The minimum speed required to put a satellite into a given orbit around earth is known as:

[A] Escape velocity
[B] Orbital velocity
[C] Kinetic velocity
[D] None of the above

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34. The angular momentum of a satellite depends on which of the following?

[A] Mass of the satellite
[B] Mass of the planet
[C] Radius of orbit of satellite
[D] All of the above

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35. Water does not fall out of a glass when it is inverted inside a satellite, which is orbiting very close to the earth’s surface. Which of the following is the best reason for this?

[A] The earth does not exert any force on the water
[B] The earth’s force of attraction on the water is exactly balanced by the force created by the satellites
[C] The water and the glass have the same acceleration due to gravity
[D] The gravitational attraction between the glass and the water balances the earth’s attraction on the

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36. By how much times the orbital speed of a satellite needs to be increased to make it escape the gravitational field?

[A] √3 times
[B] 4 times
[C] 2 times
[D] √2 times

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37. What is the effect of increase in radius of orbit on the binding energy of a satellite?

[A] it increases
[B] it decreases
[C] It remains the same
[D] None of the above

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38. What will happen to a ball if it is dropped from a spacecraft revolving around the earth at a height of 120 km?

[A] It will go very far in the space
[B] It will fall down to the earth gradually
[C] If will move with the same speed tangentially to the spacecraft
[D] It will continue to move with velocity v along the original orbit of spacecraft

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39. Which of these states of matter has the maximum density?

[A] Solids
[B] Liquids
[C] Gases
[D] None of the above

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40. What is the fourth state of matter called?

[A] Solid
[B] Liquid
[C] Gas
[D] Plasma

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