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61.

Elements have different nuclear charge but the same mass number are called

A.	isotones	B.	isobars
C.	isotopes	D.	isosteres

62.

The elements A and B which are isobaric have atomic number 18 and 20 respectively. If B contains 20 neutrons the number of neutrons in A is

A.	16	B.	18
C.	20	D.	22

63.

The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e) proton (p) neutron (n) and alpha particle (a) is

A.	e p n a	B.	n p e a
C.	n p a e	D.	n a p e

64.

An element zMA undergoes an ?-emission followed by two successive ?-emissions. The element formed is

A.	zMA-3	B.	zMA-4
C.	zMA-2	D.	zMA-6

65.

The radioactive isotope of hydrogen is called

A.	protium	B.	deuterium
C.	tritium	D.	ortho-hydrogen

66.

Unit negative charge and negligible mass are the characteristics of

A.	electrons	B.	protons
C.	neutrons	D.	mesons

67.

One amu is equal to

A.	1.66 x 10-24 kg	B.	1.66 x 10-21 kg
C.	1.66 x 10-27 kg	D.	1.66 x 10-26 kg

68.

Which one of the following elements is not radioactive?

A.	Radium	B.	Zirconium
C.	Uranium	D.	Polonium

69.

One amu is equivalent to

A.	931 J	B.	931 eV
C.	931 MeV	D.	9.31 MeV

70.

When a radioactive element emits an ?-particle it becomes

A.	electrically negative	B.	electrically positive
C.	neutral	D.	none of the above