measurement and SI units - Category wise Question and Answer Practice Test with Solutions

Question : 6 [NDA]

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 : 7 [CDS]

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 : 8 [IAS (Pre) 2008]

How can the height of a person who is six feet tall, be expressed (approximately) in nanometre?

a) 183 × $10^7$ nm

b) 183 × $10^6$ nm

c) 234 × $10^6$ nm

d) 181 × $10^7$ nm

Question : 9

S.I. unit of surface tension is

a) N/m²

b) degree/cm

c) N/m

d) N m

Question : 10 [NDA]

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