Physical Quantities and Units Question and Answers

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

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