# 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.

51. What happens to a body when its density is greater than the density of the fluid?

[A] it floats
[B] it sinks
[C] it stays at rest
[D] None of the above

52. Which of the following is NOT an application of principle of floatation?

[A] Ships
[B] Balloons
[C] Submarines
[D] None of the above

53. Which of the following is equal to the upthrust of the body?

[A] mass of body
[B] weight of liquid
[C] weight of liquid displaced
[D] density of liquid

54. What is the difference of pressure between two sides of the liquid surface called as?

[A] Excess Pressure
[B] Surface Pressure
[C] Fluidic Tension
[D] Viscosity

55. What is the density of water at 4°?

[A] 1.0
[B] 1.0 × 102 kg m–3
[C] 1.0 × 103 kg m–3
[D] 10 kg m–3

56. What is the density of air at room temperature?

[A] 1.41
[B] 1.75
[C] 1.29
[D] 1.9

57. What is the S.I unit of frequency?

[A] Second
[B] Watt
[C] Hertz
[D] Joule

58. When are the two particles said to be in same phase?

[A] if the phase difference between them is an even multiple of π
[B] if the path difference is an even multiple of (λ / 2)
[C] if the time interval is an even multiple of (T/ 2)
[D] All of the above

59. Which of these is correct about Simple Harmonic Motion?

[A] Restoring force is directly proportional to the displacement from mean position
[B] Restoring force is equal to the displacement from mean position
[C] Restoring force is inversely proportional to the displacement from mean position
[D] Restoring force is half of the displacement from mean position