Question # 1

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Neutrons are

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positive charge

negatively charged

massless

neutral

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

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

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

An alpha particle has a charge of

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+2e

-2e

-e

+3e

Neutron was discovered in

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1915

1920

1925

1932

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

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

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

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