NEET UG PHYSICS Multiple Choice Questions (MCQs)

76. The universal law of gravitation was formulated by:

Answer: a) Newton

77. The value of acceleration due to gravity decreases with:

Answer: a) Increasing altitude

78. The gravitational force between two masses is inversely proportional to the square of the distance between them. This is a statement of:

Answer: b) Newton's law of gravitation

79. The acceleration due to gravity at a height of 2R from the surface of the Earth (where R is the radius of the Earth) is:

Answer: b) g/4

80. The escape velocity at the surface of the Earth is:

Answer: a) 11.2 km/s

81. The orbital velocity of a satellite is:

Answer: c) Inversely proportional to the square root of the radius of the orbit

82. The time period of a satellite in orbit is independent of:

Answer: b) Mass of the satellite

83. Kepler’s third law of planetary motion states that the square of the orbital period of a planet is proportional to:

Answer: a) The cube of the radius of its orbit

84. Gravitational potential energy of an object near the Earth's surface is calculated using the formula:

Answer: c) U = mgh

85. At the surface of the Earth, the gravitational potential energy is taken to be zero. What is the gravitational potential energy at a height h above the surface of the Earth?

Answer: d) -GMm/(R + h)

86. A satellite is in a geostationary orbit. It has an orbital period of:

Answer: b) 24 hours

87. The motion of a satellite in orbit around a planet is an example of:

Answer: b) Non-uniform motion

88. The total energy of a satellite in orbit is:

Answer: b) Always negative

89. The gravitational potential at a point outside the Earth is:

Answer: c) Negative

90. The acceleration due to gravity at a depth of 500 km below the Earth's surface is approximately:

Answer: b) Half of that at the surface