set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

One micron equals to

a) 10^–6 m

b) 10^–3 m

c) 10^–9 m

d) 10^–2 m

Question : 2

A parsec, a unit of distance used to measure the distance related to the stars in the sky, is equal to

a) 4.50 light years

b) 4.25 light years

c) 3.25 light years

d) 3.05 light years

Question : 3

If d denotes the distance covered by a car in time t and $S↖{→}$ denotes the displacement by the car during the same time, then :

a) d≥|$S↖{→}$|

b) d ≤ |$S↖{→}$|

c) d=|$S↖{→}$|only

d) d < |$S↖{→}$|

Question : 4

Which one of the following remains constant while throwing a ball upward ?

a) Acceleration

b) Displacement

c) Kinetic energy

d) Velocity

Question : 5

Match List 'I' (Physical quantity) with list II (Dimension) and select the correct answer by using the codes given below the lists.

a) 2 1 4 3

b) 3 2 4 1

c) 1 2 3 4

d) 3 2 1 4

Question : 6

The displacement of a particle at time t is given by $X↖{→}=ai↖{˄}+btj↖{˄}+c/2{t^2}k↖{˄}$ where a, b and c are positive constants. Then the particle is

a) decelerated along $j↖{˄}$ direction

b) accelerated along $18/5$ direction

c) decelerated along $18/5$ direction

d) accelerated along $j↖{˄}$ direction