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 $6A/m$ when it is placed in an external magnetic field of $0.4T$ at a temperature of $4K$. When the sample is placed in an external magnetic field of $0.3T$ at a temperature of $24K$, 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 ${\varphi }_A$ and ${\varphi }_B$ 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