Write true or false for each statement:

(a) Two trains going in opposite directions with the same speed are at rest relative to each other.

(b) A ball is thrown vertically upwards. Its motion is uniform throughout.

(c) The motion of a train starting from one station and reaching at another station is non-uniform.

(d) A motion which repeats itself after a fixed interval of time is called periodic motion.

(e) A ball thrown by a boy from a roof-top has oscillatory motion.

(f) Mass has both magnitude and direction.

(g) Weight always acts vertically downwards.

(h) Mass varies from place to place but weight does not.

(a) False
Correct Statement — Two trains going in opposite directions with the same speed are at motion relative to each other.

(b) False
Correct Statement — A ball is thrown vertically upwards. Its motion is non-uniform throughout.

(c) True

(d) True

(e) False
Correct Statement — A ball thrown by a boy from a roof-top has curvilinear motion.

(f) False
Correct Statement — Mass has only magnitude.

(g) True

(h) False
Correct Statement — Weight varies from place to place but mass does not.