Top 500+ TRB Physics Question Paper with Answers - 4

Question: 16

The size of the atomic nucleus is in the order of

(A) 10^-10 meter

(B) 10^-9  meter 

(C) 10^-15meter

(D) 10^-8meter

Question: 17

The critical angle of diamond is

(A) 24.8°C

(B) 24.4°C

(C) 34.4°C

(D) 42.4°C

Question: 18

Post office box is a device for measuring resistant based on the principle of

(A) galvanometer

(B) potentiometer

(C) ohm meter

(D) meter bridge

Question: 19

The velocity of souna at 20°C is

(A) 120 ms^-1

(B) 330 ms^-1

(C) 340 ms^-1

(D) 344 ms^-1

Question: 20

The electrification in a boy takes place due to

(A) Positron

(B) Proton

(C) Neutron

(D) Electron