Practice paper

The dimensional formula for the Coefficient of viscosity is:

1. A[ML²T⁻²]
2. B[ML⁻¹T⁻¹]
3. C[ML⁻²T⁻¹]

In which of the following examples of motion can the body be considered approximately not a point object:

1. Aa railway carriage moving without jerks between two stations.
2. Ba monkey sitting on the top of a man cycling smoothly on a circular track.
3. Ca spinning cricket ball that turns sharply on hitting the boundary.
4. Dtumbling beaker that has slipped off the edge of a table.

If the tension in the cable supporting an elevator is equal to the weight of elevator, the elevator may be

1. Agoing up with increasing speed
2. Bgoing down with increasing speed
3. Cgoing up with uniform speed
4. Delevator falls freely under gravity.

During inelastic collision between two bodies, which of the following quantities always remain conserved

1. ATotal kinetic energy
2. BTotal mechanical energy
3. CTotal linear momentum
4. DSpeed of each body.

Which of the process described below are irreversible?

1. AThe increase in temperature of an iron rod by hammering it
2. BA gas in a small container at a temperature T1 is brought in contact with a big reservoir at a higher Temperature. T2 which inverses the temperature of the gas
3. CA quasi - state isothermal expansion of an ideal gas in cylinder fitted with a frictionless piston
4. DAn ideal gas is enclosed in a piston cylinder arrangement with adiabatic Walls. A weight W is added to the piston, resulting in compression of a gas.

The translational kinetic energy of gas molecules for 1 mol of gas is equal to:

1. A3/2(KT)
2. B3/2(RT)
3. C2/3(KT)
4. D½(RT)

The angle of contact at the interface of water glass is 0°, Ethyl alcohol–glass is 0°, Merecing–glass is 140° & Methyl iodide-glass is 30°. A glass capillary is put its a trough containing one of these for liquids. It is observed that the meniscus is convex. The liquid in the trough is

1. AWater
2. BEthyl alcohol
3. CMercury
4. DMethyl iodide.

A pendulum suspended from the ceiling of a train has a period T, when the train is at rest. When the train is accelerating with a uniform acceleration a, the period of oscillation will

1. AIncrease
2. BDecrease
3. CRemain unaffected
4. DBecome infinite