Question # 1

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Gamma rays consist of steam of

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electron

proton

photons

all of these

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Which of the following material has longer half life

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radium

polonium

radium

uranium

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

Neutrons are

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positive charge

negatively charged

massless

neutral

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

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

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

An alpha particle has a charge of

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+2e

-2e

-e

+3e

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

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

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deuteron

deterium

protium

tritium

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

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

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

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isotones

isomers

isotopes

isobars

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