CUET Level - II JEE Mock test - 5 (Chemistry)

Internal energy of a perfect gas is

• Whollypotential energy

• Wholly kinetic energy

• partially K.E. and partially P.E. of the molecules

• difference of K.E. and P.E. of the molecules

In an isothermal process, the internal energy of the system

• Decrease

• Increase

• Does not change

• None of the above

Thermodynamics is concerned with the

• Change of state

• Measurement of heat

• Transfer of heat

• None of the above

For an adiabatic process

• Temperature changes are bound to occur.

• perfect thermal insulation with surroundings are required.

• process should be quick.

• All of the above are correct.

In a Carnot’s engine, at the end point of the cycle, the temperature is

• less than the initial temperature.

• Equal to the initial temperature.

• More than the initial temperature.

• Zero

The first law of thermodynamics is represented as

• dQ = dU + dW

• dQ = 2dU + dW

• dQ = dU – dW

• dQ = dU + 2dW

The efficiency of a Carnot engine working between 227°C and 27°C is

• 100%

• 40%

• 50%

• 20%

Tell which of the following phenomenon are reversible?

• Rusting of iron by chemical change.

• Charging of a battery.

• Water fall.

• Production of heat by rubbing of hands.

When steam is converted into water, internal energy of the system

• Decreases

• Increases

• Remains constant

• Becomes zero

The efficiency of a practical engine is

• More than the efficiency of Carnot’s engine.

• less than the efficiency of Carnot’s engine.

• Equal to the efficiency of the Carnot’s engine.

• All of these