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21.

In radioactive disintegration ?-rays emission is always accompanied by

A.	?-ray emission	B.	y-ray emission
C.	neutron emission	D.	none of the above

22.

A radioactive substance gives off Y-rays when

A.	its nucleus goes from a higher energy state to a lower one	B.	one of the orbital electrons jumps from a higher orbit to one of a lower energy
C.	an orbital electron jumps from a lower orbit to a higher one	D.	its nucleus goes from a lower energy state to a higher one

23.

Atomic size is of the order of

A.	10-12 cm	B.	10-10 cm
C.	10-8 cm	D.	10-6 cm

24.

The radius of nucleus is of the order of

A.	10-10 cm	B.	10-8 cm
C.	10-14 cm	D.	10-12 cm

25.

The volume of nucleus is about

A.	10-12 times the volume of atom	B.	1012 times the volume of atom
C.	10-10 times the volume of atom	D.	10-8 times the volume of atom

26.

The density of nucleus is about

A.	10-10 times the density of atom	B.	1012 times the density of atom
C.	10-8 times the density of atom	D.	1010 times the density of atom

27.

The distance between nucleons in atomic nucleus is of the order of

A.	200 Fermi	B.	2 Fermi
C.	50 Fermi	D.	1000 Fermi

28.

The particle mainly responsible for the stability of nucleus is

A.	electron	B.	proton
C.	neutron	D.	positron

29.

Stability of nucleus depends upon the ratio of

A.	electron to proton	B.	neutron to proton
C.	neutron to electron	D.	none of the above

30.

The neutron to proton ration in a stable nucleus is about

A.	2:01	B.	1:01
C.	1:02	D.	1.6 : 1