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Question (21)

QN007131

An atom has 15 protons and 16 neutrons. Its mass number is —

(A) 15
(B) 16
(C) 31
(D) 1

Correct Answer: C

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Question (22)

QN007132

The neutron was discovered by —

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

Correct Answer: B

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Question (23)

QN007133

Which of the following particles has maximum mass?

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

Correct Answer: C

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Question (24)

QN007134

An atom with 8 protons and 8 neutrons has mass number —

(A) 8
(B) 16
(C) 24
(D) 64

Correct Answer: B

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Question (25)

QN007135

The charge on a proton is equal in magnitude to that of —

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

Correct Answer: C

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Question (26)

QN007136

The atomic number of magnesium is 12. Number of protons in magnesium atom is —

(A) 10
(B) 12
(C) 14
(D) 24

Correct Answer: B

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Question (27)

QN007137

The mass number of an atom is always a —

(A) Fraction
(B) Decimal
(C) Whole number
(D) Negative number

Correct Answer: C

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Question (28)

QN007138

Which particle has no charge but nearly the same mass as proton?

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

Correct Answer: B

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Question (29)

QN007139

The atomic number of an element is 20. Number of electrons in its neutral atom is —

(A) 10
(B) 20
(C) 30
(D) 40

Correct Answer: B

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Question (30)

QN007140

The nucleus occupies —

(A) Most of the atomic volume
(B) Very little space in atom
(C) Entire atom
(D) Only electron shell

Correct Answer: B

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