Question # 1

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

How many isotopes of helium are present?

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1

2

3

4

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Neutrons are

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positive charge

negatively charged

massless

neutral

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

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

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

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

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

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

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