Gravitational force between two masses decreases if:
a
Masses increase
b
Distance increases
c
Distance decreases
d
None of these
2
The universal law of gravitation was given by:
a
Galileo
b
Einstein
c
Newton
d
Kepler
3
The SI unit of gravitational constant G is
a
N m² kg⁻²
b
N m⁻² kg²
c
kg m s⁻²
d
N m² s⁻²
4
The value of Gravitational constant is:
a
6.67×10−⁹ N m²/kg²
b
6.67×10−¹¹ N m²/kg²
c
6.67×10−¹⁹ N m²/kg²
d
9.8 m/s²
5
If distance between two bodies is doubled, the gravitational force becomes:
a
Four times greater
b
Four times smaller
c
Half
d
Double
6
Gravitational force between Earth and Moon keeps the Moon in:
a
Straight line motion
b
Circular motion around Earth
c
Motion towards Earth
d
Rest position
7
Which of the following does not affect the gravitational force between two objects?
a
Mass of objects
b
Distance between objects
c
Value of G
d
Shape of objects
8
If medium between the masses is changed by a conductor then the gravitational force will
a
increase
b
decrease
c
remain constant
d
become zero
9
Two identical balls of masses 1 kg each having distance of 1 m between their centres then gravitational force between them is:
a
667 × 10⁻⁹ N
b
6.67 × 10⁻¹¹ N
c
667 × 10¹¹ N
d
6.67 × 10⁻¹³ N
10
Gravitational force between two objects if "F". If masses of bodies are doubled and distance between their centres is reduced to half, then gravitational force is:
a
F
b
4 F
c
d
16 F
11
The value of "g" at height of 1500 km above the surface of Earth in ms⁻² is:
a
0
b
6.4
c
9.8
d
12.2
12
If we consider Earth as perfect sphere and ignore the presence of air resistance. What will be the orbital velocity to launch a satellite in circular orbit just above the surface at r = RE = 6.4 × 10⁶ m:
a
0 km s⁻¹
b
1.19 km s⁻¹
c
3.07 km s⁻¹
d
7.9 km s⁻¹
13
When a satellite is put into a higher circular orbit, its kinetic energy:
a
Increases
b
Decreases
c
Is zero
d
Remains the same
14
The orbital velocity of geostationary satellite is:
a
0 km s⁻¹
b
1.19 km s⁻¹
c
3.07 km s⁻¹
d
7.9 km s⁻¹
15
The minimum number of geostationary satellites for the complete global coverage is:
a
1
b
2
c
3
d
4
16
When an object moves away from a massive body, its gravitational potential energy:
a
Increases
b
Decreases
c
Remains constant
d
Becomes zero
17
The value of gravitational potential at an altitude of 35700 km above the Earth’s surface, where communication satellites orbit the Earth is approximately:
a
-94.7 M J kg⁻¹
b
-62.3 M J kg⁻¹
c
+947.11 M J kg⁻¹
d
-947.11 M J kg⁻¹
18
Newton’s law of gravitation is stated as:
a
Force is independent of distance
b
Force is inversely proportional to product of masses
c
Force is proportional to product of masses and inversely proportional to square of distance
d
Force is proportional to square of distance
19
If the distance between two masses is doubled, the gravitational force becomes:
a
Half
b
One-fourth
c
Double
d
Four times
20
The gravitational force between two objects is F. If both masses are doubled and distance is halved, the new force is:
