Kerala (English Medium) Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in


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Question-1 The kinetic energy of a satellite in its orbit around the earth is E. What should be the kinetic energy of the satellite so as to enable it escape from the gravitational pull of the earth?

(A) 4 E	(B)2 E
(C)	(D)E

Question-2
The mass of a body is measured to be 12 kg on The Earth. If it is taken to moon, the mass will be

(A) 72 kg	(B) 2 kg
(C) 12 kg	(D) 24 kg

Question-3 The radius of the earth is 6400 km.What is its mass?

(A) 6.0 × 10²⁴ kg	(B)5. 0 × 10²⁴kg
(C)1.0× 10²²kg	(D)6.5 × 10¹⁴ kg

Question-4
The force with which all bodies are attracted towards the centre of earth is called

(A) Repulsive force	(B) Gravitational force
(C) Attractive force	(D) Vacuum force

Question-5
Every object in the universe attracts every other object with a force which is inversely proportional to

(A) Square of the distance	(B) Cube of the distance
(C) Distance	(D) Two times the distance

Question-6
For a freely falling body (falling vertically down wards) 'g' is

(A) Negative	(B) Positive
(C) Zero	(D) None of these

Question-7
If the mass of a person is 60 kg, What about the force when he is on moon ?

(A) 178.5 N	(B) 71.5 N
(C) 96.56 N	(D) 97.2 N

Question-8
The weight of a body on the moon is one - sixth of its weight on the earth.How will the mass of the body vary ?

(A) Becomes 1/6 th	(B) Remains the same
(C) Becomes 6 times	(D) Becomes 1/8 th

Question-9
If the masses of both the object are doubled, the gravitational force of attraction is

(A) Doubled	(B) Halved
(C) Becomes 4 times	(D) Becomes (1/4)^th

Question-10 What is the acceleration of a meteor passing by the earth at an altitude of 55000 km?

(A) 0. 11m/s²	(B)11 m/s²
(C)1. 11 m/s²	(D)5. 18 m/s²

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Std 9

Kerala (English Medium)

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