Question # 1

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

Various types of cancer are treated by

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Carbon -14

Nickel -63

Cobalt -60

Strontium -90

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

Mass equivalent of 931 MeV energy is:

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6.02 x 10^-23 kg

1.766 x 10^-27kg

2.67 x 10^-29kg

6.02 x 10^-87kg

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

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

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

The amount of energy equivalent to 1 a.m.u is

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931.5 MeV

93.15 MeV

9.315 MeV

2.224 MeV

For workers in nuclear facilities is, a weekly does of is normally considered safe

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1.0 msv

5.0 msv

2.0 msv

3.0 msv

The mass of proton in amu is:

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1.07276

1.7276

1.007276

1.0007276

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

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1

2

3

4

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

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

The radioactive decay obeys the law

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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

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

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80

79

82

83

A proton consists of quarks which are.

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Two up, one down

One up, two down

All up

All down

Which particle has larger range in air.

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Alpha rays

Gama rays

Beta rays

Neutron

Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

By emitting Beta particle and gama particle simultaneously the nucleolus changes in its charges by

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N

N/2

N/4

3N/4

The quantity of U in the naturally occurring uranium is.

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0.2%

0.3%

0.7%

0.4%

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