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Question (11)

QN007121

The nucleus of an atom contains —

(A) Only electrons
(B) Protons and electrons
(C) Neutrons and electrons
(D) Protons and neutrons

Correct Answer: D

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Question (12)

QN007122

The atomic number of carbon is 6. The number of electrons in a neutral carbon atom is —

(A) 4
(B) 5
(C) 6
(D) 12

Correct Answer: C

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Question (13)

QN007123

Which subatomic particle contributes least to atomic mass?

(A) Proton
(B) Neutron
(C) Electron
(D) Nucleus

Correct Answer: C

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Question (14)

QN007124

An atom has atomic number 17 and mass number 35. Number of neutrons is —

(A) 17
(B) 18
(C) 35
(D) 52

Correct Answer: B

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Question (15)

QN007125

Electrons revolve around the nucleus in fixed —

(A) Compounds
(B) Molecules
(C) Energy levels
(D) Isotopes

Correct Answer: C

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Question (16)

QN007126

The positively charged particle in an atom is —

(A) Electron
(B) Proton
(C) Neutron
(D) Nucleon

Correct Answer: B

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Question (17)

QN007127

Rutherford’s experiment proved that the nucleus is —

(A) Negatively charged
(B) Positively charged
(C) Neutral
(D) Empty

Correct Answer: B

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Question (18)

QN007128

Most of the space inside an atom is —

(A) Filled with electrons
(B) Filled with protons
(C) Empty
(D) Filled with neutrons

Correct Answer: C

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Question (19)

QN007129

The number of neutrons in sodium-23 is —

(A) 11
(B) 12
(C) 23
(D) 34

Correct Answer: B

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Question (20)

QN007130

Which particle was discovered by J.J. Thomson?

(A) Proton
(B) Neutron
(C) Electron
(D) Nucleus

Correct Answer: C

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