# Physical Quantities and Units

Relativistic mechanics is a branch of physics, which deals with the bodies moving with velocities:

a. More than c

b. Equal to c

c. Much less than C

d. Ans Approaching c

The dimensions of torque are:

a. [LT-1]

b. [ML2T1]

c. [MLT-2]

d. Ans [ML2T-2]

The SI unit gravitational potential is

a. Kg/joule

b. Ans Joule/Kg

c. Joulex/Kg

d. Joulex/Kg

Two vectors have unequal magnitudes can their sum be zero ?

a. Ans Yes

b. No

c. Can be zero

d. None of theser

One day is equal to

a. 5 × 107 sec

b. Ans 6.6 × 104 sec

c. 9.3 × 103 sec

d. None of these

Two equal forces (P each) act at a point inclined to each other at an angle of 120°.The magnitude of their resultant is

a. Ans P

b. 2P

c. P/2

d. P/4

Which of the following sets of concurrent forces may be in equilibrium?

a. F1 – 3 N,F2 – 5 N,F3 = 15 N

b. Ans F1 – 3 N,F2 – 5 N,F3 = 6 N

c. F1 – 3 N,F2 – 5 N,F3 = 1 N

d. F1 – 3 N,F2 – 5 N,F3 = 9 N

The ratio of nuclear magneton and and Bohr magneton is

a. mp/me

b. Ans me/mp

c. me/mp

d. 2mp/mez