Multiple Choice Questions
Multiple Choice Questions
Q.1. Force of gravitation between two bodies varies r with as :
(a) r
(b) r
(c) 1/r
(d) 1/r²
Q.2. At which of the locations the value of ‘g’ is a maximum :
(a) On the top of Mount Everest
(b) On the top of Qutub Minar
(c) At any place on the equator
(d) A camp site in Antarctica
Q.3. A stone is dropped from the top of the tower. Its speed after it has fallen 20 m is (Take g = 10 m s-²):
(a) -10 m s-1
(b) 10 m s-1
(c) -20 m s-¹
(d) 20 m s-1
Q.4. A ball is thrown vertically upward, acceleration due to gravity is:
(a) in the direction opposite to the direction of motion d
(b) in the direction same as the direction motion
(c) increases as it comes down
(d) becomes zero at the highest point
Q.5. At the top of its path a projectile :
(a) has no acceleration
(b) has acceleration in the upward direction
(c) has acceleration in the down direction
(d) has acceleration in the horizontal direction.
Q.6. Consider earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The acceleration due to gravity as measured by :
(a) A goes on decreasing, B goes on increasing
(b) B goes on decreasing, A goes on increasing
(c) each remains unchanged
(d) each goes on decreasing
Q.7. Which of the following is the evidence to show that there must be a force acting on the earth and directed towards the sun ?
(a) deviation of falling bodies towards the east
(b) revolution of the earth around the sun
(c) phenomenon of day and night
(d) apparent motion of sun around the earth
Q.8. If the earth stops rotating the value of ‘g’ at the equator will :
(a) increase
(b) remain same
(c) decrease
(d) none of these
Q.9. It is found that weight of an object is more at the poles than at the equator. So it is beneficial to purchase goods at the equator and sell them at the poles, provided :
(a) an equal beam balance is used
(b) a spring balance is used
(c) a beam balance or a spring balance is used
(d) the statement is false
Q.10. The value of gravitational constant depends upon :
(a) temperature of the atmosphere
(b) masses
(c) distance between the masses
(d) none of these
Q.11. The acceleration due to gravity on the surface of a planet whose mass and radius are both one-third of the Earth (acceleration due to gravity on the earth is g):
(a) g
(b) 3g
(c) g/3
(d) 2/3g
Q.12. In vacuum all freely falling objects :
(a) have the same speed
(b) have the same velocity
(c) have the same acceleration
(d) have the same force
Q.13. When a spaceship is two earth radii distant from the centre of the earth, its gravitational acceleration is :
(a) 19.6 m s-2
(b) 9.8 m s-2
(c) 4.9 m s-²
(d) 2.45 m s-²
Q.14. If a planet existed whose mass and radius were both half that of the earth, the acceleration due to gravity at its surface would be:
(a) 19.6 m s-²
(b) 9.8 m s-²
(c) 4.9 m s-2
(d) 2.45 m s-²
Q.15. A stone is dropped from a cliff. Its speed after it has fallen 100 m is :
(a) 9.8 m s-1
(b) 44.2 m s-1
(c) 19.69 m s-1
(d) 98 m s-1
Q.16. A ball is thrown up and attains a maximum height of 100 m, it is thrown upwards with a speed of:
(a) 9.8 m s-1
(b) 44.2 m s-1
(c) 19.69 m s-1
(d) 98 m s-1
Q.17. A stone dropped from a certain height takes 4 second to reach the ground. The height is :
(a) 19.6 m
(b) 39.2 m
(c) 156.8 m
(d) 78.4 m
Q.18. The weight of an object :
(a) is the quantity of matter it contains
(b) refers to its inertia
(c) is the force as its mass but expressed in different units
(d) is the force with which it is attracted towards the earth
Q.19. The equation is valid only for:
(a) linear bodies
(b) spherical bodies.
(c) elliptical bodies.
(d) circular bodies
Q.20. If the distance between two objects is doubled, the gravitational force between them :
(a) remains the same
(b) gets doubled
(c) gets halved
(d) becomes one-fourth
Q.21. A bomb is released from an aircraft. Its trajectory is :
(a) a straight line
(b) parabola
(c) an arc of a circle
(d) a zigzag path
Q.22. A soft drink bottle is dropped by a waiter from the top of a hotel whose height is 100 m. It takes T second to reach the ground. Where will it be at T/2 second ?
(a) 50 m from top
(b) 75 m from bottom
(c) 25 m from bottom
(d) 40 m from top
Q.23. Two bodies, one held 1 m vertically above the other, are released simultaneously and fall freely under gravity. After 2 second, the relative separation of the bodies will be :
(a) 4.9 m
(b) 9.8 m
(c) 19.6 m
(d) 1 m
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