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.

21. An earth satellite S has an orbit radius which is 2 times that of a communication satellite C. What will be the period of revolution of S?

[A] 1 day
[B] 2 days
[C] 4 days
[D] 8 days

22. What is the upward force experienced by a body, when it is immersed in a fluid, known as?

[A] Tangential force
[B] Buoyant force
[C] Centrifugal force
[D] Hydraulic force

23. Which of the following represents the Density of a material?

[A] Mass/weight
[B] Mass/Length
[C] Mass/Volume
[D] Mass/Area

24. What do we call the maximum velocity of a fluid in a tube for which the flow remains streamlined?

[A] Hyper velocity
[B] critical velocity
[C] stream velocity
[D] laminar velocity

25. What happens to the frequency of the pendulum if it is suspended from the ceiling of the lift moving downward with acceleration equal to acceleration due to gravity ?

[A] it increases
[B] it decreases
[C] No change
[D] No oscillation

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

[A] π
[B] π/4
[C] π/2
[D] 2π

27. Which of these is NOT an example of Periodic motion?

[A] Revolution of earth around the sun
[B] Rotation of earth about its polar axis
[C] Motion of minute’s hand of a clock
[D] None of the above

28. Which of the following eaves will be produced on bombarding a metal target by high energy electrons?

[A] Gamma rays
[B] X rays
[C] Infra red
[D] Microwaves

29. What is the speed of sound in air at 0 ºC?

[A] 3 x 108 m/s
[B] 344 m/s
[C] 441m/s
[D] 331 m/s