Question # 1

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

An alpha particle has a charge of

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+2e

-2e

-e

+3e

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

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

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

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

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

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

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600

7000

5000

15000

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

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

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

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