Question # 1

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

Which of the following material has smaller has life

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uranium

polonium

radium

radian

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

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

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

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 emission of radiations take place in elements, having charge number greater than

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109

82

69

52

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

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

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600

7000

5000

15000

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

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