Question # 1

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

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 radioactive decay obeys the law

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

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Baryons

Leptons

Mesons

Quarks

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

X -rays are similar in nature to.

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Gama rays

Beta rays

Alpha rays

Cathode rays

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

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

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

Radioactivity happen due to the disintegration of

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Nucleus

Mass

Electrons

Protons

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

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

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

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