set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

S.I. unit of surface tension is

a) N/m²

b) degree/cm

c) N/m

d) N m

Question : 2

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

Question : 3

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 : 4

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

a) 1 2 4 3

b) 1 4 1 3

c) 1 2 3 4

d) 2 4 3 1

Question : 5

A motor vechicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is

a) away from the centre along the radius of the circle

b) zero

c) towards the centre of circle

d) perpendicular to the radius and along the velocity

Question : 6

The smallest unit of length is

a) Angstrom

b) Micron

c) Nanometre

d) Fermimetre