RRB Junior Engineer (JE) Sample Paper: General Awareness (General Science)-23

1. An artificial earth satellite is said to be in a geo-stationary orbit when :

(a) it is so placed that it does not move.
(b) it remains stationary in relation to some point on the earth.
(c) its course is governed by terrestrial gravity.
(d) it is made to stay in one place in obedience to commands from a space centre on the earth.

2. An artificial satellite stays in the orbit around the earth because

(a) the earth’s gravity does not act on the satellite due to great distance between them.
(b) the earth’s attraction produces the necessary centripetal acceleration.
(c) the earth’s attraction is balanced by the attraction of other planets.
(d) there is an engine in the satellite which constantly applies an upward force to balance its weight.

3. Identify the correct statement about the definition of work :

(a) A force always does work on the body on which it is acting.
(b) A force does work only when the body is moving.
(c) A force does work only when the body moves under the action of force.
(d) none of these.

4. Choose the correct statement related to the mechanical energy (E).

(a) It is the total energy of a system including all forms of energy.
(b) It is that part of total energy which always remain conserved.
(c) It is the sum of microscopic kinetic and potential energies.
(d) It is the total sum of all the kinetic and potential energies.

5. Which of the following statement is true ?

(a) Kinetic energy and momentum both are conserved in all types of motion.
(b) Momentum is conserved in elastic collision but not in inelastic collision.
(c) Total kinetic energy is not conserved but momentum is conserved in inelastic collision.
(d) Kinetic energy is conserved in elastic collision but not in inelastic collision.

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1(b), 2(b), 3(c), 4(c), 5(d)