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

In an LCR circuit, the potential difference between the terminals of the inductor is 60 V,
between the terminals of capacitor is 30 V and that between the terminals of resistor is 40 V.
The supply voltage is