Question # 1

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

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

Which one belongs to lepton's group

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Electron

Muons

Neutrons

All of these

Low level radiations effects

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Less of hair

Ulceration

Drop of white blood cells

All

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

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

The force which is responsible for the breaking up of the radioactive element is.

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Weak nuclear force

Strong nuclear force

Electromagnetic force

Gravitational force

Absorbed Dose 'D' is defined as

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m/E

E/C

C/m

E/m

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

Electrons are

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Hadrons

Laptons

Quarks

Baryons

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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