PG TRB Physics Online Test - 4

Question: 16

What is nano technology?

(A) it is the engineering of functional systems at the material scale

(B) it is the engineering of functional systems at the macro scale.

(C) it is the engineering of functional systems at the molecular scale

(D) none of these

Question: 17

A jet engine works on the principle of conservation of

(A) Angular momentum

(B) Linear momentum

(C) Mass

(D) Energy

Question: 18

As compared to boiling , evaporation is a _____

(A) Rapid and calm process

(B) Rapid and noisy process

(C) Slow and noisy process

(D) Slow and calm process

Question: 19

The work done in moving a positive charge on an equipotential surface is

(A) Zero

(B) Infinte

(C) Finite and positive

(D) Finite and negative

Question: 20

The unit of work is

(A) Watt

(B) Newton

(C) Joule

(D) Dyne