Question # 1

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Gamma rays consist of steam of

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electron

proton

photons

all of these

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

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

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3

2

6

5

Electrons are

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positive charged

negatively charged

massless

neutral

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

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109

82

69

52

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Neutron was discovered in

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1915

1920

1925

1932

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

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

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

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