Explore topic-wise MCQs in Physics.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

In the given system, masses are released from rest. The young’s modulus of wire is 1011N/m2, length = 1m & radius = 2mm. Find elongation in wire when masses are moving. Assume pulley to be frictionless.

A. 1.05*10-5m
B. 2*10-5m
C. 3*10-5m
D. 0.5*10-5m
Answer» B. 2*10-5m
Discussion
2.

Strain can be negative. True or False?

A. True
B. False
Answer» B. False
Discussion
3.

A wire has a young’s modulus of 105N/m2, length 1m & radius 3mm. Assuming a uniform cross sectional area, find the radius of wire after it is under a force of 1N from both ends.

A. 2.58m
B. 2.30m
C. 3.54m
D. 2.24m
Answer» B. 2.30m
Discussion
4.

A wire with a radius of 5mm is hung freely from the ceiling. A load of 5N is applied to its free end. Find the elongation in the wire if its volume is 7.85*10-5m3 & young’s modulus is 1011N/m2.

A. 6.21*10-7m
B. 7.00*10-7m
C. 6.36*10-7m
D. 8.00*10-9m
Answer» D. 8.00*10-9m
Discussion
5.

Stress, like pressure, is always perpendicular to a plane. True or False?

A. True
B. False
Answer» C.
Discussion
6.

Stress in a solid body is defined as ___________ per unit area.

A. external force applied
B. strain
C. pressure
D. internal forces developed due to externally applied forces
Answer» E.
Discussion