Question 51 : The magnitude of the gravitational force with which the earth attracts the object of mass M, towards its center, is given by?
1. F = G M Me / Re²
2. F = G Me / Re²
3. F = G M² Me / Re²
4. F = G² M Me / Re²
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Question 52 : If a man goes to a height equal to the radius of the earth from its surface, his weight relative to that of earth would become?
1. twice
2. same
3. half
4. one-fourth
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Question 53 : According to the Newton"s Universal law of gravitation, "Every body in the universe attracts every other body with a force which is?"
1. directly proportional to the product of their masses.
2. directly proportional to the product of forces.
3. directly proportional to the distance between them.
4. directly proportional to the product of their radius.
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Question 54 : The value of G was first determined by?
1. Poynting in 1901
2. Lord Cavendish in 1798.
3. Boyle in 1917.
4. P. R. Heyl in 1998.
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Question 55 : Weight of a body is a?
1. scalar quantity
2. None of these
3. vector quantity
4. Negative quantity
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Question 56 : The mass of earth is?
1. ME = 6.98 X 10²⁴ Kg
2. ME = 5.98 X 10²⁴ Kg
3. ME = 7.98 X 10²⁴ Kg
4. ME = 9.98 x 10²⁴ Kg
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Question 57 : F on A by B = —F on B by A. These two gravitational forces constitute an action-reaction pair in accordance with Newton's?
1. Third law of motion
2. Second law of motion
3. First law of motion
4. Law of Universal Gravitation.
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Question 58 : """C"" is a universal gravitational constant and its value is?"
1. G = 6.743 x 10^-11 Nm²/Kg
2. G = 6.673>< 10^-11 N-m²/Kg
3. G = 6.973 x 10^-11 N-m²/Kg
4. G = 6.873 x 10^-11 N-m²/Kg
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Question 59 : The force exerted on body A by body B is always directed towards body B, and acts?
1. along the line joining their centers.
2. along the line joining their centers.
3. along the line joining their centers.
4. None of these.
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Question 60 : The equation for the mass of earth is?
1. ME = REg²/G²
2. ME = RE²g/G
3. ME = RE²g/G
4. ME = RE²g/G
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