Test: Gravitation - 2 | 25 Questions MCQ Test

QUESTION: 1

If 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

Solution:

QUESTION: 2

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.
Depends upon the object

Solution:

QUESTION: 3

Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong ?

A.
It is a freely falling body
B.
It is moving with constant speed
C.
It suffers no acceleration
D.
Its angular momentum remains constant

Solution:

Centripetal acceleration works on it.

QUESTION: 4

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

A.
Positive
B.
Negative
C.
Zero
D.
May be positive or negative depending upon its initial velocity

Solution:

Kinetic energy would be obvious = 0.5mv^2

and the potential Energy would be= -Gm/r^2

Now total energy = 0.5mv^2 – Gm/r^2 hence would be negative as r approaches infinity.

QUESTION: 5

SI unit of g is

A.
m²/s
B.
s/m²
C.
m/s²
D.
m/s

Solution:

QUESTION: 6

SI unit of G is

A.
N²–m²/kg
B.
N–m²/kg
C.
N–m/kg
D.
N -m²/kg²

Solution:

QUESTION: 7

Choose the correct statement of the following:

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

Solution:

QUESTION: 8

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 earth

Solution:

QUESTION: 9

If the distance between two masses be doubled, then the force between them will become

A.
1/4 times
B.
4 times
C.
1/2 times
D.
2 times

Solution:

QUESTION: 10

A body falls freely towards the earth with

A.
Uniform speed
B.
Uniform velocity
C.
Uniform acceleration
D.
None of these

Solution:

QUESTION: 11

If the mass of a body is M on the surface of the earth, then its mass on the surface of the moon will be

A.
M/6
B.
M
C.
M + 6
D.
Zero

Solution:

QUESTION: 12

Weight

A.
Is a vector quantity
B.
Of a body in interplanetary space is maximum
C.
Increases when the bodies go up
D.
None of these

Solution:

QUESTION: 13

The value of g near the earth's surface is

A.
8.9 m/s²
B.
8.9 m/s
C.
9.8 m/s²
D.
9.8 m/s

Solution:

QUESTION: 14

A geostationary satellite

A.
Moves faster than the near earth satellite
B.
Has a time period less that of a near earth satellite
C.
Revolves about the polar axis
D.
Is stationary in space

Solution:

A geostationary satellite revolves around the earth with the same angular velocity and in the same sense as done by the earth about its own axis, i.e. west-east direction. A polar satellite revolves around the earth's pole in north-south direction.

QUESTION: 15

The force of gravitation between two bodies depend upon

A.
Their separation
B.
Gravitational constant
C.
Product of their masses
D.
All of these

Solution:

QUESTION: 16

When an object is thrown up, the force of gravity

A.
Acts 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

Solution:

QUESTION: 17

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

Solution:

QUESTION: 18

1 kg wt is equal to

A.
9.8 N
B.
980 N
C.
98 N
D.
None of these

Solution: 1 kg-wt and express it in newton. 1 kilogram weight is that gravitational force which acts on a body of mass 1 kg. This means that the weight of 1 kgmass is 9.8 N.
Hence the answer is option (a)

QUESTION: 19

Mass of oil is 11040 kg and volume is 12 m³, its density would be

A.
92 kg m^-3
B.
920 kg m^-3
C.
9.2 kg m^-3
D.
1.08 × 10^-3

Solution:

QUESTION: 20

The value of G does not depend on

A.
Nature of the interacting bodies
B.
Size of the interacting bodies
C.
Mass of the interacting bodies
D.
All of these

Solution:

QUESTION: 21

The mass of the Jupiter is 1.9 × 10²⁷ kg and that of the sun is 1.99 × 10³⁸kg. The mean distance of the Jupiter from the sun is 7.8 × 10¹¹ m. Speed of the Jupiter is (assuming that Jupiter moves in a circular orbit around the sun)

A.
1.304 × 10⁴ m/sec
B.
13.04 × 10⁴ m/sec
C.
1.304 × 10⁶ m/sec
D.
1.304 × 10² m/sec

Solution:

QUESTION: 22

The acceleration due to gravity

A.
has the same value everywhere in space

has the same value everywhere on the earth
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

Solution:

QUESTION: 23

SI unit of weight is

A.
kg wt
B.
N
C.
g wt
D.
none of these

Solution:

QUESTION: 24

Gravitational force which acts on 1 kg is

A.
9.8 N
B.
1/9.8 N
C.
980 N
D.
none of these

Solution:

QUESTION: 25

Weight is

A.
measured by a spring balance
B.
measured by a beam balance
C.
measured in kg
D.
a scalar quantity

Solution:

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25 Questions MCQ Test NCERT Textbooks (Class 6 to Class 12) | Test: Gravitation - 2

If a rock is brought from the surface of the moon

A body is weighed at the poles and then at the equator. The weight

Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong ?

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