Question # 1

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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

Electrons are

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positive charged

negatively charged

massless

neutral

Gamma rays consist of steam of

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electron

proton

photons

all of these

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

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

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