Question # 1

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

Number of Isotopes of Neon gas are

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2

3

4

1

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

Which one of the following is not affected by electric or magnetic field.

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Beta rays

Gama ryas

Alpha rays

Electron

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 radioactive decay obeys the law

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Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Various types of cancer are treated by

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Carbon -14

Nickel -63

Cobalt -60

Strontium -90

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 SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

Which one belongs to lepton's group

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Electron

Muons

Neutrons

All of these

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

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

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

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