Physics Test - ...

When a system is taken from state i to state f along the path iaf, it is found that Q = 50 cal and W = 20 cal . Along the path ibf Q = 36 cal. W along the path ibf is:

An engine has an efficiency of 1/6. When the temperature of the sink is reduced by 62oC, its efficiency is doubled. The temperature of the source is

A wire is cut into four pieces, which are put together by sides to obtain one conductor. If the original resistance of wire was R, then the resistance of the bundle will be

Equation of a transverse wave travelling in a rope is given by \(y=5 \sin (4 t-\) \(0.02 \mathrm{x})\) where \(\mathrm{y}\) and \(\mathrm{x}\) are expressed in \(\mathrm{cm}\) and time in seconds. Calculatevelocity of the wave.

In an arrangement of resistances shown in the diagram, the potential difference between B and D will be zero, when the unknown resistance X is

A uniform ladder rest in limiting equilibrium with its lower end on a rough horizontal plane and its upper end against a smooth vertical wall, if \(\theta\) is an angle of inclination of the ladder to the vertical wall and \(\mu\) is the coefficient of friction, then tan \(\theta\) is equal to

The pressure and density of a diatomic gas \(\left(Y=\frac{7}{5}\right)\) change adiabatically from \(\left(P_{1}, \rho_{1}\right)_{\text {to }}\left(P_{2}, \rho_{2}\right),\) if \(\frac{\rho_{2}}{\rho_{1}}=32,\) then what should be the value of \(\frac{P_{2}}{P_{1}} ?\)

The engine of a train crosses an electric pole with velocity 'u', and the last compartment of the train crosses the same pole with a velocity 'v'. The velocity with which the middle part of the train crosses the pole is

Five particles of mass 2 kg are attached to the rim of a circular disc of radius 0.1 m and a negligible mass. Moment of inertia of the system about the axis passing through the centre of the disc, perpendicular to its plane is

Two masses m1and m2are suspended together by a mass-less spring of spring constant K. When the masses are in equilibrium, m1 is removed without disturbing the system.The angular frequency and amplitude of oscillation of m2 are