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. Kepler’s second law is also known as:
[A] Law of periods
[B] Law of areas
[C] Law of orbits
[D] Law of Planets
Show Answer
Correct Answer: B [Law of areas]
Notes:
Kepler’s second law states that an imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time i.e. the areal velocity of the planet around the sun is constant. It is also known as Law of areas.
42. Which of the following statements is correct?
[A] The acceleration due to gravity is same at the equator and the poles
[B] The acceleration due to gravity is maximum at the poles
[C] The acceleration due to gravity is least at the poles
[D] None of the above
Show Answer
Correct Answer: B [The acceleration due to gravity is maximum at the poles]
Notes:
The acceleration due to gravity is maximum at the poles and is least at the equator. The value of acceleration due to gravity increases as we go from the equator to the pole.
43. Which of the following is correct about the value of acceleration due to gravity?
[A] it is greater at mountains than in plains
[B] it is lesser at mountains than in plains
[C] it is equal for mountains and plains
[D] None of the above
Show Answer
Correct Answer: B [it is lesser at mountains than in plains]
Notes:
The value of acceleration due to gravity decreases with increase in height. Therefore, it is lesser at mountains than in plains.
44. 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
Show Answer
Correct Answer: D [All of the above]
Notes:
The value of acceleration due to gravity vary due to the following factors : (a) Shape of the earth (b) Height above the earth surface (c) Depth below the earth surface (d) Axial rotation of the earth
45. In comparison to the gravitational force the earth exerts on the moon, the gravitational force the moon exerts on earth ________?
[A] will be greater
[B] will be lesser
[C] will be same
[D] None of the above
Show Answer
Correct Answer: C [will be same]
Notes:
Earth and moon both exerts same force on each other, even though the mass of the moon is about 1.2% of the mass of the earth.
46. What is the value of escape velocity for earth?
[A] 9.8 km s-2
[B] 1.6 km s-2
[C] 11.2 km s-2
[D] 7.92 km s-2
Show Answer
Correct Answer: C [11.2 km s-2]
Notes:
The value of escape velocity is different for different planets. For earth, this value is 11.2 km s-2.
47. On which of the following the escape velocity of a body does not depend?
[A] Mass of the body
[B] Radius of the planet
[C] Mass of the planet
[D] None of the above
Show Answer
Correct Answer: A [Mass of the body]
Notes:
The escape velocity is independent of the mass and angle of projection of the body. Escape velocity depends on the mass and radius of the planet from the surface of which the body is to be projected.
48. Which of these represent the Angular momentum of a satellite?
[A] mvr
[B] ma
[C] mr
[D] mvh
Show Answer
Correct Answer: A [mvr]
Notes:
Angular momentum of satellite is given by mvr. Angular momentum of satellite depend on both the mass of orbiting and central body as well as the radius of orbit.
49. What is the property of matter by which a body tends to regain its original configuration after the removal of deforming force known as?
[A] Plasticity
[B] Ductility
[C] Elasticity
[D] Malleability
Show Answer
Correct Answer: C [Elasticity]
Notes:
The property of matter because of which a body tends to regain its original shape and size after the deforming force is removed is called its elasticity. Plasticity: It is that property of matter by virtue of which it does not regain its original shape and size after the removal of deforming force.
50. Who was the first to state the principle of floatation?
[A] Isaac Newton
[B] Archimedes
[C] Aristotle
[D] Galileo Galilei
Show Answer
Correct Answer: B [Archimedes]
Notes:
Archimedes, the Ancient Greek scientist was the first to state the principle of floatation. Archimedes principle states that when a body is immersed partly or wholly in a liquid, there is an apparent loss in the weight of the body which is equal to the weight of liquid displaced by the body.
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