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⁞ Physics

General Science ➤ Physics ➤ 2
Question 6
Q6.  Which of the following is true about universal gravitational constant in the case of two bodies each of unit mass having their centres placed at unit distance apart?
 

Answer :  It is equal to the force of attraction between them


The universal gravitational constant is equal to the force of attraction between two bodies each of unit mass having their centres placed at unit distance apart.
F = Gm1m2/r When m1 and m2 = 1 and r=1 then F=G.
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Question 7
Q7.  The ratio of the magnitude of the external force applied on a body to the magnitude of acceleration produced in its motion is known as:
 

Answer :  Inertial Mass


The inertial mass of a body may be measured as the ratio of the magnitude of the external force applied on it to the magnitude of acceleration produced in its motion. It is the measure of ability of the body to oppose the production of acceleration in its motion by an external force.
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Question 8
Q8.  By how much the orbital velocity of Moon has to increase for it to cease to remain the earth’s satellite?
 

Answer :  √2 times


If the speed of a satellite orbiting close to the earth is made √2 times (or increased by 41%) then it will escape from the gravitational field. Moon is a natural satellite of earth.
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Question 9
Q9.  On which of the following factors the breaking stress depends?
 

Answer :  Nature of the material


Breaking force = P × A Here P is a constant of proportionality and known as breaking stress. Breaking stress is constant for a given material and does not depend upon the dimension (length or thickness) of wire.
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Question 10
Q10.  What happens to the time period of the simple pendulum if the solid bob is replaced by a hollow sphere of same radius but half the mass?
 

Answer :  time period remains unchanged


Time period of simple pendulum is independent of mass of the bob.
Therefore, If the solid bob is replaced by a hollow sphere of same radius but different mass, time period remains unchanged.
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