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MCQ Questions for CBSE Class 12 with Answers
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MCQ Questions for CBSE Class 6 with Answers
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Gravitation Class 9 MCQ Questions With Answers
1.
The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio
1:2
2:1
1:4
4:1
2.
The acceleration due to gravity on the Earth depends upon the
radius of the Earth
mass of the Earth
shape and size of the body
Both A & B
3.
The gravitational force between two objects is F. If masses of both objects are halved without changing the distance between them, then the gravitational force would become
F/8
F/4
F/2
4F
4.
In the relation F = GM m/d2, the quantity G
depends on the value of G at the place of observation
is used only when the Earth is one of the two masses
is greatest at the surface of the Earth
is universal constant of nature
5.
The atmosphere is held to the Earth by
gravity
wind
clouds
Earthâ€™s magnetic field
6.
Law of gravitation gives the gravitational force between
the Earth and a point mass only
the Earth and Sun only
any two bodies having some mass
two charged bodies only
7.
The weight of any person on the moon is about 1/6 times that on the earth. He can lift a mass of 12 kg on the earth. What will be the maximum mass, which can be lifted by the same force applied by the person on the moon?
60KG
72KG
54KG
96KG
8.
A stone is released from the top of a tower of height 19.6 m. Then its final velocity just before touching the ground will be:
384.16 m/ s
196 m/s
19.6 m/s
3841.4 m/s
9.
The gravitational force between two massive spheres
is always an attraction.
depends on how massive they are.
depends inversely on the square of the distances betwn them.
all of the above
10.
If the mass of Earth increased, with no change in radius, your weight would _____.
increase also
stay the same
decrease
None of these
11.
Acceleration due to gravity on the surface of a planet is g/5 where g is the value on the earth. When a body is vertically thrown up on the earth, it reaches a maximum height h. If the same body is projected with the same velocity from the surface of planet, maximum height reached by it would be
h/5
h/25
5h
25h
12.
The value of acceleration due to gravity
decreases from pole to equator
is least on equator
is least on equator
Both A & B
13.
The force of attraction between two unit point masses separated by a unit distance is called
gravitational potential
acceleration due to gravity
gravitational field
universal gravitational constant
14.
The mass of moon is about 0.012 times that of the earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:
Same as that on the earth
About one-fifth of that on the earth
About one-sixth of that on the earth
About one-fourth of that on the earth
15.
If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
The weight of body will become zero but the mass will remain same.
The weight of a body will remain same but the mass will become zero.
Both mass and weight become zero.
Neither mass nor weight becomes zero.
16.
Suppose Fg between two massive spheres = 90 N. If distance between spheres is tripled, new Fg=
270 N
10 N
810 N
30 N
17.
The weight of an object at the centre of the Earth of radius R is
zero
infinite
R times the weight at the surface of the Earth
1/R2 times the weight at surface of the Earth
18.
The value of quantity G in the law of gravitation
depends on mass of Earth only
depends on radius of Earth only
depends on both mass and radius of Earth
is independent of mass and radius of the Earth
19.
A 1000-kg car rests on the Earth. The magnitude of Fg of the Earth on the car is:
6.67 x10-11 N
9.8 N
9800 N
1000 N
20.
An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F1 is the magnitude of force exerted by the Earth on the apple and F2 is the magnitude of force exerted by the apple on the Earth, then
F1 is very much greater than F2
F2 is very much greater than F1
F1 is only a little greater than F2
F1 and F1 are equal
21.
When a mango falls from a mango tree then
only the Earth attracts the mango.
only the mango attracts the Earth.
both the mango and the Earth attract each other.
both the mango and the Earth repel each other.
22.
In the last question, what is the magnitude of the gravitational force of the car on the Earth?
less than the force of the Earth on the car
equal to the force of the Earth on the car
greater than the force of the Earth on the car
None of these
23.
Two objects of different masses falling freely near the surface of the moon would
have same velocities at any instant
have different acceleration
experience forces of same magnitude
undergo a change in their inertia
24.
Two objects move toward each other gravitationally. As they get closer, the force between them:
remains constant
increases
decreases
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