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• 1.
If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas when the volume changes from V to 2V under constant pressure p is:
• A.

RI (γ-1)

• B.

PV

• C.

PV I (γ-1)

• D.

γρV I(γ-1)

• 2.
Two walls of thickness  and  and thermal conductivities  and  are in contact. In the steady state, if the temperatures at the outer surfaces are and , the temperature at the outer wall is:
• A.
• B.
• C.
• D.
• 3.
A particle of charge +q an Eî and uniform magnetic field Bk follows a trajectory from P to Q as shown in the figure. The velocities at P and Q are vî and -2vĵ. Which of the following statement(s) is/are correct? (There can be multiple correct answers.)
• A.
• B.

Rate of work done by the electric field at P is

• C.

Rate of work done by the electric field at P is zero.

• D.

Rate of work done by both the fields at Q is zero.

• 4.
Two rods, one of aluminium and the other made of steel, having initial lengths l1 and l2 are connected together to form a single rod of length l1+l2. The coefficients of linear expansion for aluminium and steel are αa and αs respectively. If the length of each rod increases by the same amount when their temperatures are raised by tC, then find ratio :
• A.
• B.
• C.
• D.
• 5.
What is the condition for a single process to be both Isothermal and Isobaric?
• A.

One must use an ideal gas

• B.

Such a process is impossible

• C.

A change of phase is essential

• D.

One may use any real gas such as .