1. The universal law of gravitation was postulated by
(a) Copernicus
(b) Newton
(c) Galileo
(d) Archimedes
2. A rock is brought from the surface of the moon,
(a) Its mass will change
(b) Its weight will change but not mass
(c) Both mass and weight will change
(d) Its mass and weight both will remain same
3. A body is weighed at the poles and then at the equator. The weight
(a) At the equator will be greater than at the poles
(b) At the poles will be greater than at the equator
(c) At the poles will be equal to the weight at the equator
(d) None of these
4. A lead ball and a snow ball of identical radius are released from a certain height in vacuum. The times taken by both of them to reach the ground are
(a) Exactly equal
(b) Roughly equal
(c) Unequal
(d) In the ratio of the density of lead and snow
5. The weight a body at the centre of the earth is
(a) Zero
(b) Equal to its mass
(c) Maximum
(d) Infinite
6. Choose the correct statement:
(a) All bodies repel each other in this universe.
(b) Our earth does not behave like a magnet.
(c) Acceleration due to gravity is 8.9 m/s2
(d) All bodies fall at the same rate in vacuum.
7. The maximum weight of a body is
(a) At the centre of the earth
(b) Inside the earth
(c) On the surface of the earth
(d) Above the surface of the earth
8. The force of gravitation between two bodies does not depend upon
(a) Their separation
(b) The gravitational constant
(c) The product of their masses
(d) The sum of their masses
9. The type of force which exists between charged bodies is
(a) Only gravitational
(b) Only electrical
(c) Neither gravitational nor electrical
(d) Both electrical and gravitational
10. When a fruit falls from a tree
(a) Only the earth attracts the fruit
(b) Both the earth and the fruit attract each other
(c) Only fruit attracts the earth
(d) They repel each other
11. When an object is thrown up, the force of gravity
(a) Act in the direction of the motion
(b) Acts in the opposite direction of the motion
(c) Remains constant as the body moves up
(d) Increases as the body moves up
12. Newton's law of gravitation
(a) Can be verified in the laboratory
(b) Is valid only in the solar system
(c) Cannot be verified but is true
(d) Is valid only on earth
13. If the distance between two particles is halved, the gravitational force becomes
(a) Four times
(b) Two times
(c) eight times
(d) None of these
14. The force of gravitation exists
(a) Everywhere in the universe
(b) At the surface of the earth only
(c) Inside the earth only
(d) At the surface of the moon only
15. Newton's law of gravitation holds good for
(a) Small bodies only
(b) Terrestrial bodies only
(c) Big bodies only
(d) All types of bodies
16. The gravitational force is a
(a) Contact force
(b) Action-at-a-distance force
(c) Neither (a) nor (b)
(d) Both (a) and (b)
17. Which of the following forces is responsible for the flow of water in rivers?
(a) Force of friction
(b) Gravitational force
(c) Electrostatic force
(d) Magnetic force
18. Name the force responsible for holding the atmosphere near the surface of the earth.
(a) Electrostatic force
(b) Magnetic force
(c) Frictional force
(d) Gravitational force
19. The value of G is independent of
(a) The mass of G is interacting bodies
(b) The space where the particles are kept
(c) The time at which the force is considered
(d) All the above are correct
20. Name the scientist who first performed Galileo's experiment on the moon.
(a) David Scott
(b) Cavendish
(c) Newton
(d) None of these
21. In vacuum all freely falling bodies
(a) Have the same speed
(b) Have the same velocity
(c) Have the same force
(d) Have the same acceleration
22. When an object is thrown up, the force of gravity is
(a) Constant
(b) Increases as it rises up
(c) Opposite to the direction of motion
(d) In the same direction as the direction of motion
23. At the centre of the earth, the value of g becomes
(a) Zero
(b) Unity
(c) Infinity
(d) None of these
24. The acceleration due to gravity
(a) Has the same value everywhere in space
(b) Has the same value everywhere on the earth
(c) Varies with the latitude on the earth
(d) Is greater on the moon due to its smaller diameter
25. Weight is
(a) Measured by a spring balance
(b) Measured by a beam balance
(c) Measured in kg
(d) A scalar quantity
26. The weight of an object
(a) Is the quantity of the matter it contains
(b) Refers to its inertia
(c) Is the same as its mass but is expressed in different units
(d) Is the force with which it is attracted to wards the earth
27. The gravitational pull exerted by the earth on a body is called its
(a) True weight
(b) Mass
(c) Gravitational mass
(d) Inertial mass
28. A weighing machine measures
(a) Weight only
(b) Mass only
(c) Mass and weight
(d) None of these
29. A person stands on a weighting machine kept on the floor of an elevator. When the elevator is at rest, then the apparent weight of the person is
(a) Equal to its true weight
(b) Less than its true weight
(c) More than its true weight
(d) More or less than its true weight.
30. A person stands on a weighting machine kept on the floor of an elevator. When the elevator is at rest, then the apparent weight of the person is, if the elevator moves down with a constant acceleration, the apparent weight of the person is
(a) less than its true weight
(b) equal to its true weight
(c) more than its true weight
(d) more or less than its true weight
31. Rockets work on the principle of conservation of
(a) Mass
(b) Energy
(c) Momentum
(d) None of the above
32. Rockets work on the principle of conservation of suppose the cable breaks, then the weight machine will read
(a) More than the weight or the body
(b) Less than the weight of the body
(c) Equal to the weight of the body
(d) Zero
33. While orbiting around the earth in a spaceship, an astronaut experiences
(a) More weight
(b) Lesser weight
(c) weightlessness
(d) Nothing at all
34. Which of the following motion is different from others?
(a) A ball thrown horizontally in air.
(b) A bomb released from a flying aeroplane
(c) A javelin thrown by an athlete.
(d) A bird flying in the air.
35. An object thrown into space horizontally under the action of earth's gravity is called a
(a) Projectile
(b) Trajectory
(c) Spaceship
(d) None of these
36. The path followed by a projectile is called its
(a) Trajectory
(b) Range
(c) Amplitude
(d) None of these
37. The horizontal distance travelled by a projectile is called its
(a) Trajectory
(b) Range
(c) Amplitude
(d) None of these
38. The time period of a geostationary satellite is
(a) 24 hrs
(b) 6 hrs
(c) 365 days
(d) None of these
39. The weakest force of interaction is
(a) Electrostatic
(b) Gravitational
(c) Nuclear
(d) Electromagnetic
40. Weightlessness in a satellite is because of
(a) Intertia
(b) Zero gravity
(c) Centre of gravity
(d) Acceleration
41. The space in which a body experiences a force by virtue of its mass is called
(a) Magnetic field
(b) Electric field
(c) Gravitational field
(d) None of these
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