Question # 1

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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 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

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

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

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

Three quarks make:

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An electron

A meson

A baryon

A photon

None 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

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

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

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

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

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