A nucleus of mass number A and atomic number Z contains MCQ with Answer and Explanation

Question Report Error

A nucleus of mass number A and atomic number Z contains

A. Z protons and A-Z neutrons

B. A protons and Z neutrons

C. A-Z protons and Z neutrons

D. Z protons and A neutrons

Answer: Option A

Solution (By JKExamLibrary)

Atomic number Z = number of protons. Mass number A = protons + neutrons. So neutrons = A - Z. Electrons = Z in neutral atom. Isotopes same Z, different N.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A body falls freely from rest. The ratio of distances covered in 1st, 2nd, and 3rd seconds is

A. 1:2:3

B. 1:3:5

C. 1:1:1

D. 1:4:9

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Correct Answer: Option B

Explanation:
s_nth = u + (g/2)(2n-1). u=0 => s ∝ (2n-1). So 1, 3, 5. Classic kinematic ratio.

This question belongs to: Science Physics

Question #2 Report Error

The device used for detecting feeble electric current is

A. Wattmeter

B. Galvanometer

C. Voltmeter

D. Ammeter

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Correct Answer: Option B

Explanation:
Galvanometer detects small currents and direction. Ammeter measures larger currents.

This question belongs to: Science Physics

Question #3 Report Error

In the equation F = ma, if mass is doubled and acceleration is halved, force becomes

A. Half

B. Four times

C. Double

D. Same

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Correct Answer: Option D

Explanation:
F = m×a. New force F' = (2m)×(a/2) = m×a = F. So force remains unchanged. This is direct proportionality. Understand the relationship: doubling mass doubles force, halving acceleration halves it, net effect no change.

This question belongs to: Science Physics

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