Question # 1

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

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80

79

82

83

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

The most useful tracer is.

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Strontium -90

Iodine -31

Cobalt -60

Carbon -14

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

James chadwick discovered:

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Proton

Positron

Neutron

Electron

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

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

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

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

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

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

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