# 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.

41. Work done will NOT be zero in which of the following case/cases?

[A] When displacement is zero
[B] When angle between force and displacement vector is zero
[C] When angle between force and displacement vector is 90°
[D] When force is zero

42. The work done by a variable force is given by:

[A] area under the force curve and the displacement axis
[B] square of the area under the force curve and the displacement axis
[C] natural log of the area under the force curve and the displacement axis
[D] twice the area under the force curve and the displacement axis

43. Kepler’s second law is also known as:

[A] Law of periods
[B] Law of areas
[C] Law of orbits
[D] Law of Planets

44. Which of the following is incorrect:

[A] Gravitational force of attraction is independent of nature of intervening medium
[B] Gravitational forces are central forces
[C] Gravitational forces are non-conservative forces
[D] All of the above

45. The value of acceleration due to gravity is minimum on which of these planets?

[A] Mars
[B] Jupiter
[C] Mercury
[D] Neptune

46. The acceleration due to gravity on any planet does not depend on which of the following?

[B] Mass of the planet
[C] Density of the planet
[D] Mass of the object

47. On which of the following the escape velocity of a body does not depend?

[A] Mass of the body
[C] Mass of the planet
[D] None of the above

48. What is the height of geo-stationary satellites from the surface of the earth?

[A] 30000 km
[B] 36000 km
[C] 48000 km
[D] 72000 km

49. Which of the following is the orbital velocity of a satellite orbiting very close to the surface of earth?

[A] 7.92 km/s
[B] 9.8 km/s
[C] 11.2 km/s
[D] 14.8 km/s