Question # 1

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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