Question

A planet has double the mass of earth and double the radius of earth. What is the value of ‘g’ on that planet?
2 points
10
5
20
80
2) A person has a mass of 120 kg on earth. What is its weight on moon?
1 point
120
1200
200
800
3) Two objects of masses 100000 kg and 1000000000 kg are kept 100 km apart what is gravitational force between them?
2 points
0.000000667
0.0000057
0.00000094
0.00000754
4) Gravitational force is not a -------
1 point
Weak force
Universal force
Action and Reaction pair
Repulsive force
5) For a free fall
1 point
u=0
v=0
a=g
s=0
6) Unit of ‘G’ is -------
1 point
N m m/kg kg
N m/kg
N cm/kg
N m m/g g
7) How does the force of gravitation between two objects change when the distance between them is reduced to half
1 point
becomes 1/3
becomes 4 times
becomes thrice
reduced to half
8) A stone is released from the top of a tower of a heights 19.6 m. Then its final velocity just before touching the ground will be
2 points
17.8 m/s
26.8 m/s
18.6 m/s
19.6 m/s
9) The mass of an object ------------
1 point
Varies at different locations
remains constant
can be measured using spring balance
is in the direction of gravitational force
10) The value of ‘g’ at the poles -------
1 point
is more than equator
same as at the equator
is less than at the equator
zero
11) Acceleration due to gravity on earth depends upon the ---------
1 point
mass of body
mass of earth
shape and size of body
volume of body
12) The weight of an object at the centre of the earth of radius R is ----
1 point
zero
infinite
R times the weight at the surface of earth
1/R times the weight at the surface of earth
13) A stone falls from tower and reach on earth surface in 3.5 sec (i) What is its speed on striking the ground? (ii) What is the height of tower from ground? (g = 9.8)
2 points
12.5 m/s , 30m
24.2 m/s , 50.2m
34.3 m/s , 60.02m
27.5 m/s , 55m
14) An object is thrown vertically upwards and rises to a height of 40m (i) calculate the velocity with which the object was thrown upwards and (ii) the time taken by the object to reach the highest point. (g = 9.8)
2 points
48 m/s , 1.23 sec
58 m/s , 1.56 sec
34 m/s , 2.46 sec
28 m/s , 2.86 sec
15) Calculate the force of gravitation between two objects of masses 50 kg and 120 kg respectively , kept at a distance 10m from each other.
1 point
0.0000000040038
0.00000040038
0.000040038
0.0040038​

Answer 1

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