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Question (31)

QN007141

Which statement is correct about electrons?

(A) They are present inside nucleus
(B) They are positively charged
(C) They revolve around nucleus
(D) They contribute maximum mass

Correct Answer: C

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Question (32)

QN007142

If an atom has 19 protons and 20 neutrons, its mass number is —

(A) 19
(B) 20
(C) 39
(D) 1

Correct Answer: C

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Question (33)

QN007143

The particle responsible for radioactivity studies leading to atomic discoveries was —

(A) Alpha particle
(B) Proton
(C) Electron
(D) Neutron

Correct Answer: A

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Question (34)

QN007144

Which scientist proposed the nuclear model of atom?

(A) Dalton
(B) Thomson
(C) Rutherford
(D) Chadwick

Correct Answer: C

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Question (35)

QN007145

An atom with atomic number 9 has how many protons?

(A) 18
(B) 9
(C) 10
(D) 19

Correct Answer: B

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Question (36)

QN007146

Which of the following is electrically neutral?

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

Correct Answer: C

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Question (37)

QN007147

The atomic number of an element remains unchanged because the number of —

(A) Electrons changes
(B) Neutrons changes
(C) Protons remains fixed
(D) Shells remains fixed

Correct Answer: C

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Question (38)

QN007148

An atom has mass number 40 and atomic number 18. Number of neutrons is —

(A) 18
(B) 22
(C) 40
(D) 58

Correct Answer: B

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Question (39)

QN007149

The lightest subatomic particle is —

(A) Proton
(B) Neutron
(C) Electron
(D) Alpha particle

Correct Answer: C

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Question (40)

QN007150

Which part of atom contains almost all the mass?

(A) Electron cloud
(B) Nucleus
(C) Shell
(D) Orbit

Correct Answer: B

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