Fusion reaction takes place at high temp.

(a)

atoms are ionised

(b)

molecules break up

(c)

nuclei break up

(d)

to overcome repulsion between nuclei

The main source of stellar energy is
(i) fission reactors
(ii) fusion reaction
(iii) chemical reaction
(iv) thermonuclear reactions

(a)

(i) is correct

(b)

(i) & (ii) are correct

(c)

(i) & (iv) are correct

(d)

(ii) & (iv) are correct

A chain reaction is continuous due to

(a)

large mass defect

(b)

large energy

(c)

production of more neutrons in fission

(d)

None of these

Atomic nucleus was discovered by _______

(a)

Rutherford

(b)

Newton

(c)

Einstein

(d)

Nobel

Nucleons are made of ________.

(a)

atoms

(b)

electrons and protons

(c)

electrons and neutrons

(d)

protons and neutrons