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31.

The nucleus is very dense and rigid because

A.	nucleus is positively charged	B.	nucleus is the centre of atom
C.	?-rays are deflected by nucleus	D.	almost whole of the mass is concentrated in nucleus

32.

In a most stable element the the number of protons and the number of neutron is

A.	even-even	B.	even-odd
C.	odd-even	D.	odd-odd

33.

Gamma rays are

A.	high energy electrons	B.	high energy electromagnetic waves
C.	low energy electrons	D.	low energy electromagnetic waves

34.

Radioactive decay is

A.	a physical change	B.	a chemical change
C.	a nuclear change	D.	none of the above

35.

During radioactive decay Beta particles are ejected from

A.	nucleus	B.	outer nuclear region
C.	outermost shell	D.	innermost shell

36.

In an ?-decay the ratio of neutron to proton

A.	decreases	B.	increases
C.	remains unchanged	D.	may decrease or increase

37.

In ?-decay the ratio of neutron to proton

A.	remains unchanged	B.	decreases
C.	increases	D.	may decrease or increase

38.

Select the correct statement.

A.	Ionising power of ?-rays is higher than that of ?-rays	B.	Penetrating power of ?-rays is higher than that of ?-rays
C.	?-rays are composed of positively charged particles of mass 2	D.	?-rays travel faster than ?-rays

39.

The nuclide 91X234 is the Beta decay product of

A.	92A234	B.	91B235
C.	90C234	D.	93C238

40.

Select the only correct statement out of the following:

A.	The mass of a nucleus is proportional to its density	B.	The mass of a nucleus is inversely proportional to its density
C.	The mass of a nucleus is proportional to its volume	D.	The mass of a nucleus is inversely proportional to its volume