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1
It has been observed that an object dropped from a height falls towards the Earth because of ________________
Electrostatic Force
Gravitational Force
Chemical Force
None of these
2
The total content of the body which measures the inertia of a body is called _____________________.
Weight
Mass
Displacement
Energy
3
The force of _____________________ between two objects is called the force of gravitation or gravitational force.
Attraction
Repulsion
Both (a) and (b) are correct.
4
What is the SI unit of weight ?
Kilogram
Newton
Newton/metre
Gram
5
Gravitational Force is an example of _________________.
Contact Force
Non Contact Force
6
The gravitational force of attraction between any two particles in the universe is _____________________ proportional to the product of the masses of the particles.
Directly
Inversely
7
A boy carries a fish in one hand and a bucket of water in the other hand. If he places the fish in the bucket, the weight now carried by him
Is less than before
Is more than before
Is the same as before
Depend upon his speed
8
The force of gravitation between two objects of masses 1 Kg and 2 Kg separated by a distance of 100 cm, is
2 G
G
0.2 G
G-1
9
Which of the following are correct :
(a) The mass of the body can be zero.
(b) The mass of the body cannot be zero.
Only (a) is correct.
Only (b) is correct.
None of these.
10
There are two planets A and B. The mass of planet A is two times to that of B and radius of planet A is three times to that of planet B. The ratio of their acceleration due to gravity is
2:3
2:9
3:2
9:2
11
Which of the following is incorrect:
1. It has been observed that an object dropped from a height falls towards the Earth i.e. earth pulls everything towards itself.
2. Newton generalized this idea and said that not only earth but every object in the universe attracts every other body.
Only 1
Only 2
Both 1 and 2
12
The stress in the in the string is ___________________.
30 N
14 N
4 N
20 N
13
A block of mass 5kg is pulled upwards by applying a constant force of 65 N. The acceleration with it would move upwareds is:(g = 10 )
14
The imaginary line from the sun to the planet sweeps ___________________________
Equal distance in equal interval of time
Equal area in equal interval of time
Not always
Cannot be said
15
(a) The force of attraction was first observed by Sir Isaac Newton
(b) The force of attraction between two objects is called the force of gravitation or gravitational force.
(c) If a body(ball) is thrown upwards, it reaches a certain height and falls downwards because of the frictional force of the earth.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
All of these
16
Compute the weight of a body on earth and moon whose mass is 25 kg ?
240 N, 400 N
200 N, 450 N
245 N, 40.834 N
150 N, 35.645 N
17
(a) The SI unit of G is Nm2/kg2 .
(b) The gravitational force of attraction between any two particles in the universe is inversely proportional to the product of the masses of the particles
(c) The gravitational force of attraction between any two particles in the universe is directly proportional to the square of the distance between the particles.
Only (c) is correct.
18
Which of the following is not an example of gravitational force.
If a body(ball) is thrown upwards, it reaches a certain height and falls downwards because of the gravity of the earth.
If the moon stopped revolving around the Earth, the mass of the Earth would pull the moon to the Earth.
If there was no larger mass around us, then a pencil would be attracted to our body as our body has a larger mass.
19
A ball of mass 15 Kg is attracted by another ball of same mass with a force G N. The distance between them is
15 m
45 m
30 m
225 m
20
(a) Weight of an object is the force with which it is attracted towards the Earth.
(b) Weight of an object is not constant; it changes from place to place.
(c) Weight of an object is constant; it cannot changes from place to place.
All of these.