Consider two wires X and Y. The radius of wire X is 3 times the radius of Y. If they are stretched by the same load then the stress on Y is

(a)

equal to that on X

(b)

thrice that on X

(c)

nine times that on X

(d)

Half that on X

A small sphere of radius 2cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to

(a)

2²

(b)

2³

(c)

2⁴

(d)

2⁵

The young’s modulus for a perfect rigid body is

(a)

0

(b)

1

(c)

0.5

(d)

infinity

The wettability of a surface by a liquid depends primarily on

(a)

viscosity

(b)

surface tension

(c)

density

(d)

angle of contact between the surface and the liquid

An air bubble of diameter 4 mm rises steadily i through a solution of density 1500 kgm²³ at the rate of 30cm^-1 the coefficient of viscosity of the solution is _____________.

(a)

3.3\(\times\)10^-3 poise

(b)

2.2\(\times\)10^-3 poise

(c)

3.3\(\times\)10^-3 poise

(d)

4.4\(\times\)10^-3 poise

Within the elastic limit, the stretching strain produced in wires A, B, and C due to stress is shown in the figure. Assume the load applied are the same and discuss the elastic property of the material.

Write down the elastic modulus in ascending order

A metal cube of side 0.20 m is subjected to a shearing force of 4000 N. The top surface is displaced through 0.50 cm with respect to the bottom. Calculate the shear modulus of elasticity of the metal.

Define stress and strain.

Define Poisson’s ratio.

Which one of these is more elastic, steel or rubber? Why?

What is the effect of temperature on elasticity?

State Pascal’s law in fluids.

State Archimedes principle.

Define terminal velocity.

State the principle and usage of Venturimeter.

Why two holes are made to empty an oil tin?

Define 'Plasticity'?

What is meant by 'Molecular range'?

A solid sphere has a radius of 1.5 cm and a mass of 0.038 kg. Calculate the specific gravity or relative density of the sphere.

Water rises in a capillary tube to a height of 2.0cm. How much will the water rise through another capillary tube whose radius is one-third of the first tube?

In a normal adult, the average speed of the blood through the aorta (radius r = 0.8 cm) is 0.33 ms^-1. From the aorta, the blood goes into major arteries, which are 30 in number, each of radius 0.4 cm. Calculate the speed of the blood through the arteries.

State Hooke’s law and verify it with the help of an experiment?

State and prove Pascal’s law in fluids?

What is capillarity? Obtain an expression for the surface tension of a liquid by capillary rise method.

State and prove Bernoulli’s theorem for a flow of incompressible, non-viscous, and streamlined flow of fluid.