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71.

When a radioactive element emits a ?-particle it becomes

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

72.

The electron volt is the unit of

A.	energy	B.	momentum
C.	potential difference	D.	charge

73.

Select the only correct statement

A.	Energy can be converted into matter but matter cannot be converted into energy	B.	Matter can be converted into energy but energy cannot be converted into matter
C.	Energy and matter both can be converted into each other	D.	Neither energy can be converted into matter nor can matter be converted into energy

74.

Since the mass defect of the helium nucleus is 5.045 x 10-26 gm its binding energy must be

A.	5.045 x 10-26 erg	B.	4.54 x 10-5 erg
C.	4.54 x 10-5 J	D.	5.045 x 10-26 J

75.

When combined in a nucleus the total mass of the protons and neutrons is less than the sum of their individual masses. This suggests that

A.	the mass defect is due to electrons revolving round the nucleus	B.	the mass defect accounts for the energy of the electrons revolving round the nucleus
C.	the mass defect accounts for the binding energy holding the particles together in the nucleus	D.	the experiments are not accurate enough

76.

Mass loss of 0.1364 amu is observed in the synthesis of 0-16 nucleus from its components. The binding evergy of 0-16 nucleus is about

A.	0.1364 MeV	B.	50 MeV
C.	112 MeV	D.	127 MeV

77.

Binding energy of helium - 4 is 28.57 MeV. Its binding energy per nucleon is

A.	19.24 MeV	B.	7.14 MeV
C.	4.75 MeV	D.	57.14 MeV

78.

Nuclear forces are

A.	electrostatic	B.	inter nuclear forces
C.	exchange forces	D.	protonic forces

79.

The force holding the particles inside a nucleus is

A.	an electrostatic force	B.	a gravitational force
C.	an exchange force	D.	a magnetic force

80.

The range of nuclear forces is

A.	10-8 cm	B.	10-13 cm
C.	10-16 cm	D.	100 angstron