Question # 1

In isotopes numbers of ________________ is same.

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Protons

Electrons

Neutrons

Mass number

Energy of a shell is ________________

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Variable

Constant

Cannot be changed

Nil

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

The boiling point of H2O is:

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100

12

1.105

9

Deuterium is used to make:

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light water

heavy water

soft water

hard water

Canal rays are actually

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Electrons

Protons

Neutrons

X-rays

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

In ________________ Bohr considered hydrogen atom for his model .

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1913

1916

1917

1918

The p subshell has:

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one orbital

two orbitals

three orbitals

four orbitals

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

The lowest energy level is

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K

L

M

N

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