Question # 1

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

The mass of proton in amu is:

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1.07276

1.7276

1.007276

1.0007276

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

The moderator used in a nuclear reactor

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Sodium

Uranium

Graphite

Cadmium

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