Question # 1

Half life of C-14 ________________ years.

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5800

5700

5600

5500

The lowest energy level is

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K

L

M

N

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

In isotopes numbers of ________________ is same.

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Protons

Electrons

Neutrons

Mass number

Hydrogen has ________________ isotopes.

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1

2

3

4

In ________________ Bohr considered hydrogen atom for his model .

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1913

1916

1917

1918

In ________________ Rutherford's was studying radiations.

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1911

1931

1921

1922

The boiling point of H2O is:

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100

12

1.105

9

First energy level is denoted by:

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K

L

M

N

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

Which of the following can accommodate 18 electrons?

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K

L

M

N

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9th Class Chemistry Chapter 2 Structure of Atoms English Medium KPK Boards Online Mcqs MCQs With Answers

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