﻿ Medical Entrance Exam Question and Answers | Mechanical Properties of Solids - Zigya

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# Mechanical Properties of Solids

#### Multiple Choice Questions

11.

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?

• 9F

• 6F

• F

• 4F

12.

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is

• 13.2 cm

• 8 cm

• 16 cm

• 12.5 cm

13.

A ball falling in a lake depth 200 m shows a decrease of 0.1 % in its volume at the bottom then the bulk modulus of the material of the ball is

• $19.2×{10}^{7}\mathrm{N}/{\mathrm{m}}^{2}$

14.

A fixed volume of iron is drawn into a wire of length l. The extension x produced in this wire by a constant force F is proportional to

• l

• $\frac{1}{\mathrm{l}}$

• ${\mathrm{l}}^{2}$

• $\frac{1}{{\mathrm{l}}^{2}}$

15.

Two bars A and B of circular cross-section and same volume made of same material are subjected under same tension. If the diameter of A is half that of B. The ratio of extension of A to B will be

• 16

• 2

• $\frac{1}{4}$

• 4

16.

The dimensional formula for Young's modulus is

17.

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double slit experiment is

• infinite

• five

• three

• zero

18.

A wire can be broken by applying load of 200 N. The force required to break another wire of the same length and same material, but double in diameter is

• 200 N

• 400 N

• 600 N

• 800 N

19.

A cube of side 40 mm has its upper face displaced by 0.1 mm by a tangential force of 8 kN. The shearing modulus of cube is

• 2 × 109 Nm-2

• 4 × 109 Nm-2

• 8 × 109 Nm-2

• 16 × 109 Nm-2

20.

If Young's double slit experiment is performed i water instead of air, then

• no fringes would be seen

• fringe width would decrease

• fringe width would increase

• fringe width would remain unchanged