Explore topic-wise MCQs in Physics.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

A wire has a cross sectional area ‘A’, length ‘L’ and young’s modulus ‘Y’. It is pulled by a force ‘F’ which causes a total extension of length ‘l’. The force F is so adjusted that the wire is only slowly stretched. Find the work done by the force in pulling the string by a length ‘dx’ when extension is x (0 > x > l).

A. ½*stress*strain*volume
B. (AY/L)xdx
C. F*l
D. ½*stress * strain
Answer» C. F*l
Discussion
2.

Which of the following stresses causes change in density, as long as force acts on the body?

A. Shear stress
B. Compressive Stress
C. Tensile stress
D. Volumetric stress
Answer» E.
Discussion
3.

The shear force applied has a magnitude of 1N. The box given below was initially a cube of 50cm side. Find the value of A *1010. Shear Modulus ‘G’ = 1010N/m2.

A. 4 radians
B. 4 degrees
C. 2 radians
D. 2 degrees
Answer» B. 4 degrees
Discussion
4.

A lake has a depth of 500m. The bulk modulus of water is 2*109N/m2. Calculate the fractional compression, ΔV/V, of water at the bottom of the lake.

A. 2.5*10-3
B. 7*10-3
C. 3.5*10-3
D. 5*10-3
Answer» B. 7*10-3
Discussion
5.

Select the correct option. B is bulk modulus.

A. Bgas > Bliquid > Bsolid
B. Bliquid > Bgas> Bsolid
C. Bsolid > Bliquid > Bgas
D. Bliquid > Bgas > Bsolid
Answer» D. Bliquid > Bgas > Bsolid
Discussion
6.

A 10N force is uniformly distributed over the surface of a sphere of radius 20cm. The force at each point acts inward along the normal at that point. Find the fractional change in volume if the compressibility of the sphere is 10-11m2/N.

A. 3*10-10
B. 1.5*10-11
C. 1.98*10-10
D. 2*10-11
Answer» D. 2*10-11
Discussion
7.

Bulk modulus is defined as -P / (ΔV/V). Therefore it can be negative. True or False?

A. True
B. False
Answer» C.
Discussion
8.

Which of the following represents volumetric strain?

A. -ΔV/V
B. ΔV/V
C. Pressure/Volume
D. -P / (ΔV/V)
Answer» C. Pressure/Volume
Discussion
9.

A small body having mass 1kg is rotating in a circle of radius 10cm. It is connected to the centre with the help of a string having young’s modulus = 1011N/m2. Find change in length of wire while the mass is rotating with constant speed of 2m/s. The cross sectional area of string is 1cm2.

A. 0.4μm
B. 4μm
C. 40μm
D. 0.4m
Answer» B. 4μm
Discussion
10.

Which of the following quantities have the same S.I. unit as that of modulus of elasticity?

A. Energy per unit volume
B. Force per unit length
C. Energy
D. Change in length
Answer» B. Force per unit length
Discussion