Physics Test 11...

A wheel whose moment of inertia is12 kgm² has an initial angular velocity of 40 rad/s. A constant torque of 20 NM acts on the wheel. The time in which the wheel is accelerated to 100 rad/s is

The M.I. of a solid sphere of mass M and radius R about an axis at a distance 2R from centre is

A reversible engine Converts one-sixth of the heat input into work. When the temperature of the sink is reduced by  the efficiency of the engine is doubled. The temperature of source and sink are

Two liquids A and B are 32^oC and 24^oC. When mixed in equal masses the temperature of the mixture is found to be 28^oC. Their specific heats are in the ratio of

Which of the following is not a postulate of kinetic theory of gases ?

Certain perfect gas is found to obey PV^3/2 = constant during an adiabatic process. If such a gas at initial temperature T is adiabatically compressed to half the initial volume, its final temperature will be

The first law of thermodynamics is concerned with the conservation of

For hydrogen the temperature and volume are related to each other according to the relation  When the gas undergoes an adiabatic process and changes from thermodynamic state 1 to 2, the value of x is

The colour of a star is an indication of its

A given mass of a gas expands from the state A to the state B by three paths 1, 2 and 3 as shown in the figure.

If W₁, W₂ and W₃ respectively be the work done by the gas along the three paths then