Q: If a body moves in such a way that its velocity increases by equal amount in equal intervals of time, it is said to be moving with

(a) :  a uniform retardation
(b) :  a uniform acceleratio
(c) :  a variable acceleration
(d) :  a variable retardation
(e) :  None of these
Answer:  a variable acceleration

Q: If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called

(a) :  virtual work
(b) :  imaginary work
(c) :  zero work
(d) :  negative work.
(e) :  None of these
Answer:  negative work.

Q: A body of weight 14 g appears to weight 13 g when weighed by a spring balance in a moving lift. The acceleration of the lift at that moment was

(a) :  0.5 m/sec2
(b) :  1 cm/sec2.
(c) :  0.7 m/sec2
(d) :  1 m/sec2
(e) :  None of these
Answer:  0.7 m/sec2

Q: A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec2. Time required to traverse a distance of 1.5 m, is

(a) :  40 sec
(b) :  30 sec
(c) :  20 sec
(d) :  15 sec
(e) :  10 sec.
Answer:  20 sec

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