Choose the correct Answers.
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Two masses are separated by a distance r . If both masses are doubled, the force of attraction between them changes by a factor of
a) 2
b)4
c) 1/2
d)1/4
Answer : (b)
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The radius of earth Re is
a) 9.8 m
b) 6.67 ×10-11 m
c) 6×10²⁴ m
d) 6.4×10⁶ m
Answer: (d)
3. The S.I. unit for gravitational constant “G” is
a) N/kg²
b) Nm²/kg²
c) Nm²kg²
d) N/m²kg²
Answer: (b)
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What is the mass on planet Mercury of an object that weighs 784 Newton on earth surface.
a) 80.0 kg
b) 118 kg
c) 784 kg
d) more information needed
Answer: (a)
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An object is orbiting a planet with orbital speed v, if the radius is same and the mass is increased 4 times by what factor orbital speed will change
a) 2
b) 4
c) 1/2
d) 1/4
Answer: (a)
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The value of g at the surface of moon is
a)9.8m/s²
b)1.63m/s²
c)4.9 m/s²
d)8.9m/s²
Answer: (b)
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The value of g… at altitude
a) increase
b) decreases
c)gets zero
d) Remains the same
Answer: (b)
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When a body is moved from sea level to the top of mountain, there is a change in Body’s
a) mass
b) weight
c) none
d) both mass and weight
Answer: (b)
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The value of g at the equator is…
a) Same at poles
b) larger at poles
c) smaller at poles
d) none
Answer: (c)
