Question # 1

Marie Curie and Pierre Curie discovered.

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Uranium

Uranium and Radium

Polonium and radium

Radium

Unit of decay constantλ is:

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ms

m^-1

m

S^-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

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

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

The radioactive decay obeys the law

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The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

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

How many times, the alpha particle is more massive than electrons.

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6332

7332

8332

9332

The mass spectrum of naturally occurring neon, showing

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1 isotope

2 isotope

3 isotope

4 isotope

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

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