Question # 1

Neuron was discovered by

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Sir Willium Crooks

Goldstein

James Chadwik

Neil Bohr

Energy of a shell is ________________

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Variable

Constant

Cannot be changed

Nil

The maximum no.of electrons that can be accommodated in M shell are

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2

8

18

32

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

Hydrogen has ________________ isotopes.

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1

2

3

4

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

The concept of orbit was used by:

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J.J Thomson

Rutherford

Bohr

Planck

Atoms of elements combine chemically to form:

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Mixtures

compounds

solutions

ions

In isotopes numbers of ________________ is same.

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Protons

Electrons

Neutrons

Mass number

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

The lowest energy level is

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K

L

M

N

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

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