The frequency of oscillation of current in the inductance is

1.56 X $10^5$J of heat is conducted through a 2 $m^2$ wall of 12 cm thick in one hour.
Temperature difference between the two sides of the wall is 20 °C.
The thermal conductivity of the material of the wall is (in W $m^{-1} K^{-1}$)

A stone of relative density K is released from rest on the surface of a lake. If viscous
effects are ignored, the stone sinks in water with an acceleration of

A block B is pushed momentarily along a horizontal surface with an initial velocity v. If $\\mu$ is
the coefficient of sliding friction between B and the surface, block B will come to rest after a time

A body falling from a height h travels 40 m in the last two seconds of its fall to ground. The
height h in metres is (use g = 10 $ms^{-2}$)

A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on
the wall, for its two different positions. The are of the source obtained is

A body is thrown horizontal from the top of a tower and strikes the ground after three seconds
at an angle of 45° with the horizontal. Then find the height of the tower

The gravitational field due to a mass distribution is I= $\\dfrac{C}{x^{2}}$ in x direction. Here, C is constant.
Taking the gravitational potential to be zero at infinity, potential at x is:

Figure shows a rectangular coil of cross-sectional area A placed in a uniform magnetic field B
directed along z-axis. The torque on coil is

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20°C,
the temperature of the surroundings to which it rejects heat is