Physics Test - ...

A thief stole a box with valuable article of weight W and jumped down a wall of height h. Before he reach the ground he experienced a load of-

Find the amount of work done in rotating a dipole of dipole moment \(3 \times 10^{-3} {~cm}\) from its position of stable equilibrium to the position of unstable equilibrium, in a uniform electric field of intensity \(10^{4} {NC}^{-1}\).

Why can't we explain the photoelectric effect by the wave theory of light?

A paramagnetic sample shows a net magnetisation of \(6 {A} / {m}\) when it is placed in an external magnetic field of \(0.4 {T}\) at a temperature of \(4 {K}\). When the sample is placed in an external magnetic field of \(0.3 {T}\) at a temperature of \(24 {K}\), then the magnetisation will be:

The stopping potential for material \(A\) is more than material \(B\) when a light of frequency \(\mathrm{V}\) is incident on both the materials. If the work function of material \(A\) and material \(B\) is \(\phi_{A}\) and \(\phi_{B}\) respectively, then:

If F₁ is the force exerted by the earth on the moon and F₂ is the force exerted by the moon on earth. Which force is greater according to newton’s law of gravitation?

The reflecting surface is given by \(\mathrm{y}=\frac{10 \mathrm{~L}}{\pi} \sin \frac{\pi \mathrm{x}}{5 \mathrm{~L}}\). The co-ordinates of the point where a horizontal ray becomes vertical after reflection is:

Three thermodynamic systems are at a temperature of 60^∘C. What can be concluded about them?

The ratio of magnetic field and magnetic moment at the centre of a current carrying circular loop is X. When both the current and radius is doubled the ratio will be