Mass and Density of the Earth Multiple Questions and Answers.




1.If the density of the planet is doubled without any change in its radius, how does g change on the planet?
A. It remains the same
B. It is tripled
C. It reduces
D. It is doubled

2.A man waves his arm while walking. This is?
A. To keep constant velocity
B. To ease the tension
C. To increase the velocity
D. To balance the effect of earth’s gravity

3.Kepler’s second law is based on?
A. Newton’s first law
B. Newton’s second law
C. Special theory of relativity
D. Conservation of angular momentum

4.For a satellite escape velocity from the earth is 11.2 km/s. If a body is to be projected in a direction making an angle 45° to the vertical, then what is the escape velocity?
A. 11.2×2km/s
B. 11.2km/s
C. 11.2×√2km/s
D. 11.2/√2km/s

5.If earth loses its gravity, then for a body?
A. A weight becomes zero, but not the mass
B. Mass becomes zero but not weight
C. Neither mass nor weight becomes zero
D. Both mass and weight are zero

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