Question # 1

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

Electrons are

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positive charged

negatively charged

massless

neutral

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

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 figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

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

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

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