Question # 1

Gamma rays from cobalt -60 are used for treatment of.

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

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

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Beta rays

Gama ryas

Alpha rays

Electron

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

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

The number of Isotopes of cesium are.

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4

32

22

36

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

James chadwick discovered:

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Proton

Positron

Neutron

Electron

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

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

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80

79

82

83

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

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