PG TRB Physics Study Materials 2020 - 2021 - 4

Question: 16

When ice melts, then the

(A) volume decreases

(B) volume increases

(C) mass increases

(D) mass decreases

Question: 17

If a tuning fork vibrates the vibrations are called

(A) Damped vibrations

(B) Resonant vibrations

(C) Free vibrations

(D) Forced vibrations

Question: 18

By which one of the following, an old written material which cannot be read easily, can be read?

(A) X rays

(B) IR rays

(C) Alpha rays

(D) Beta rays

Question: 19

If an object absorbs all colours , it appears

(A) black

(B) red

(C) yellow

(D) violet

Question: 20

Who of the following recognized that large quantity of energy is released as a result of the fusion of hydrogen nuclei to form deuterium?

(A) Hans Bethe

(B) Werner Heisenberg

(C) Enrico Fermi

(D) Glenn Seaborq