Question # 1

In Wilson cloud chamber, if tracks are thick, straight and continuous, then particle is

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a-particles

ß-particles

Y-rays

All

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

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

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

If the following particle have the same energy, which particle has the shortest wave length.

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alpha particle

Neutron

Beta particle

Proton

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

Which particle has larger range in air.

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Alpha rays

Gama rays

Beta rays

Neutron

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

The types of quacks are.

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2

3

4

6

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

When nitrogen is bombarded by alpha particles nitrogen nucleus changes into

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Oxygen

Carbon

Barium

Helium

The radio active nuclide ₈₆Ra²²⁸ decays by a series of emissions of three alpha particles and one beta particle. The nuclide X finally formed is:

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₆₄X²²⁰

₈₆X²²²

₈₄X²¹⁶

₈₈X²¹⁵

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

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

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80

79

82

83

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