Question # 1

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Energy released by conversion of 1 amu is

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200 MeV

931 MeV

233 MeV

243 MeV

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

The mass spectrum of naturally occurring neon, showing

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1 isotope

2 isotope

3 isotope

4 isotope

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

Marie Curie and Pierre Curie discovered.

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Uranium

Uranium and Radium

Polonium and radium

Radium

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

Both xenon and caesium each have:

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41 isotopes

36 isotopes

43 isotopes

33 isotopes

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

The Unit of decay constant.

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Second

(second)-1

m-1

mk

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

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

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