Physics Test - ...

Find the ratio of the magnitude of linear momentum, if two bodies A and B of mass 9 kg and 25 kg respectively are moving with equal kinetic energy.

In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbit is:

A clock that keeps correct time at \(25^{\circ} C\) has a pendulum made of metal. The temperature falls to \(0^{\circ} C .\) If the coefficient of linear expansion of the metal is \(1.9 \times 10^{-5}\) per \(^{\circ} C\), then find the number of seconds the clock gains per day.

In a p-n-p transistor, working as a common base amplifier, the current gain is \(0.96\) and the emitter current is \(7.2\) mA. The base current is:

An infinite line charge produces a field of \(9 \times 10^{4} N / C\) at distance of \(2 \) cm. Calculate the linear charge density.

The rest mass of the photon is:

The Brewsters angle \(i_{b}\) for an interface should be:

At what absolute temperature \(T\) is the root mean square speed of a hydrogen molecule equal to its escape velocity from the surface of the moon? The radius of the moon is \(R, g\) is the acceleration due to gravity on the moon's surface, \(m\) is the mass of a hydrogen molecule and \(k\) is the Boltzmann constant.

If number of neutrons become more than the number of electrons in the element then it will become:

A geyser heats water flowing at the rate of \(3.0\) litres per minute from \(27^{\circ} C\) to \(77^{\circ} C\). If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is \(4.0 \times 10^{4} J / g\) ?