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Physics 9 Chapter 5 - Gravitation - 5
1.
The acceleration due to gravity on the surface of moon is 1.62 ms
-2
. The radius of moon is 1740 km. Find the mass of moon?
a) 7.35 x 10
20
Kg
b) 7.35 x 10
22
Kg
c) 7.35 x 10
21
Kg
d) 7.35 x 10
19
Kg
2.
Which of the following will be equal in the action and reaction due to force of gravitation?
a) Magnitude of force
b) Neither magnitude nor direction of force
c) Direction of force
d) Both magnitude and direction of force
3.
Calculate the value of g at a height of 3600 km above the surface of the Earth?
a) 40 ms
-2
b) 0.4 ms
-2
c) 0.40 ms
-2
d) 4.0 ms
-2
4.
Which of the following will be different in the action and reaction due to force of gravitation?
a) Neither magnitude nor direction of force
b) Magnitude of force
c) Both magnitude and direction of force
d) Direction of force
5.
With which law, the Newton’s law of gravitation is in consistent?
a) Newton’s third law of motion
b) Einstein’s mass-energy equation
c) Newton’s first law of motion
d) Newton’s second law of motion
6.
Which of the following law is in consistent with Newton’s third law of motion?
a) Newton’s law of gravitation
b) Newton’s second law of motion
c) Law of inertia
d) Einstein’s mass-energy equation
7.
Which of the following law states that to every action there is always an equal but opposite reaction?
a) Newton’s law of gravitation
b) Newton’s third law of motion
c) Newton’s first law of motion
d) Newton’s second law of motion
8.
What is the formula of the gravitational force between a body of mass m and the Earth?
a) F = [G (m - M
e
)] + r
2
b) F = [G (m - M
e
)] / r
2
c) F = [G (m x M
e
)] / r
2
d) F = [G (m x M
e
)] + r
2
9.
What is ‘M
e
’ in the formula: F = [G (m x M
e
)] / r
2
?
a) Radius of earth
b) ass of the Earth
c) Gravitational constant
d) Mass of the object
10.
Two lead spheres each of mass 1000 kg are kept with their centres 1 m apart. Find the gravitational force with which they attract each other?
a) 7.036 x 10
-12
Nm
2
Kg
-2
b) 3.006 x 10
-89
Nm
2
Kg
-2
c) 1.000 x 10
-6
Nm
2
Kg
-2
d) 6.673 x 10
-5
Nm
2
Kg
-2
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