Physics Test - ...

An electric dipole, when held at ${30}^{\circ }$ with respect to a uniform electric field of ${10}^4\mathrm{N}/\mathrm{C}$ experiences a torque of $9\times {10}^{-26}\mathrm{N}\mathrm{m}$. Calculate the dipole moment of the dipole.

Which of the following materials have higher retentivity of magnetism?

Velocity of sound waves in air is $330\mathrm{m}/\mathrm{s}$ for a particular sound wave in air, a path difference of $40\mathrm{cm}$ is equivalent to phase difference of $1.6\pi$. The frequency of this wave will be:

The ratio of the energy required to raise a satellite upto a height $R$ (where $R$ is the radius of earth) from the surface of the earth to the energy required to put it into an orbit at a height $2R$ from the surface of the earth is:

A force produces an acceleration of $5.0\mathrm{cm}/{\mathrm{s}}^2$ when it acts on a body of mass $20\mathrm{g}$. Find the force acting on the body.

The accuracy in the measurement of the diameter of hydrogen atom as $1.06\times {10}^{-10}$ m is:

A full-wave rectifier is fed with ac mains of frequency $50$ Hz. What is the fundamental frequency of the ripple in the output current?