Question # 1

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

The types of quacks are.

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2

3

4

6

The number of Neutron is²³⁸U₉₂is

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92

238

146

330

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