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. Why a small liquid drop is in spherical shape?

[A] due to surface tension
[B] due to low viscosity
[C] due to hydrogen bonding
[D] due to low density

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32. Which is the effect of increase in impurities on the surface tension of the liquid?

[A] It increases
[B] It decreases
[C] It may increase or decrease
[D] No change

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33. What is Reynolds number?

[A] ratio of inertial force to viscous force
[B] ratio of weight of fluid to viscous force
[C] ratio of velocity gradient to viscous force
[D] reciprocal of viscous force

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34. What is the phase of a vibrating particle at t = 0 known as?

[A] epoch
[B] eon
[C] path difference
[D] period

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35. By what phase angle the velocity is ahead of displacement in S.H.M?

[A] π
[B] π/4
[C] π/2
[D] 2π

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36. What do we call a motion which repeat itself over and over again after a regular interval of time?

[A] Periodic Motion
[B] Rotary Motion
[C] Linear Motion
[D] Rotational Motion

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37. What kinds of waves are the ultrasonic waves in air produced by a vibrating quartz crystal?

[A] Transverse
[B] Longitudinal
[C] Transverse and longitudinal
[D] None of the above

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38. What is the wavelength range of Radio waves?

[A] between 400 nm and 800 nm
[B] between 1 nm and 10-3 nm
[C] more than 0.1 m
[D] None of the above

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39. What is the relationship between the velocity of sound and the pressure of gas when the temperature remains constant?

[A] directly proportional to each other
[B] inversely proportional to each other
[C] independent of each other
[D] None of the above

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40. Which of the following is correct about a Sound wave?

[A] It is a mechanical wave
[B] It is an electromagnetic wave
[C] It is both a mechanical and electromagnetic wave
[D] It is neither a mechanical nor an electromagnetic wave

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