Question # 1

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

The charge number of Ba is.

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197

141

56

85

The number of protons in any atom are always equal to the number of

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Neutrons

Electrons

Positrons

Mesoris

The amount of energy equivalent to 1 a.m.u is

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931.5 MeV

93.15 MeV

9.315 MeV

2.224 MeV

The charge on Beta particle is

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+e

-e

-2e

None of these

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

The force which is responsible for the breaking up of the radioactive element is.

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Weak nuclear force

Strong nuclear force

Electromagnetic force

Gravitational force

The number of neutrons in Li are

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2

3

4

7

1 gray is equal to.

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1 JKg-1

1KgJ-1

1JKg

1 JKg-2

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

Various types of cancer are treated by

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Carbon -14

Nickel -63

Cobalt -60

Strontium -90

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

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