Question # 1

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

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

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

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

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

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

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

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

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