Question # 1

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

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

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Protactinium

Actinium

Uranium

Radium

Redon

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

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

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isotones

isomers

isotopes

isobars

Neutron was discovered in

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1915

1920

1925

1932

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

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