Physics Test-26...

A reversible heat engine receives \(3000 K J\) of heat from a constant temperature source at \(650 K\). If the surroundings is at \(295 K\), calculate the availability of heat energy.

Two bodies \(\mathrm{A}\) and \(\mathrm{B}\) have masses \(20 \mathrm{~kg}\) and \(5 \mathrm{~kg}\) respectively. If they acquire the same kinetic energy. Find the ratio of thier velocities.

Through which of the following does electric current not flow?

The magnetic field in a plane electromagnetic wave is given by \(B_{y}=\left(2 \times 10^{-7}\right) \mathrm{T} \sin \left(0.5 \times 10^{3} x+1.5 \times 10^{11} t\right)\). This electromagnetic wave is:

In the given circuit, the current through zener diode is :

The ratio of intensity of magnetisation to the magnetisation force is known as:

A hydraulic press is based on the principle of-

The mass of spaceship is 1000 kg. It is to be launched from the earth’s surface out into free space. The value of ‘g’ and ‘R’ (radius of earth) are 10 m/s² and 6400 km respectively. The required energy for this work will be:

In a solid '\(AB\)' having the \(NaCl\) structure, '\(A\)' atoms occupy the corners of the cubic unit cell. If all the face centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is: