Question # 1

Gamma rays consist of steam of

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electron

proton

photons

all of these

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

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

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

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

The number of isotopes of hydrogen are

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2

1

3

4

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

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

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Neutrons are

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positive charge

negatively charged

massless

neutral

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

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