List of top Physics Questions

A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move
Electric potential at the centre of a charged hollow metal sphere is
The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is
A boy aims at a bird from a point at a horizontal distance of $100 \,m$. The gun can impart a velocity of $500\, m/s$ to the bullet. At what height above the bird must he aim his gun in order to hit? $(g = 10\, m/ s^2)$.
The particle executing simple harmonic motion has a kinetic energy $ K_0 \cos^2 \omega t $.. The maximum values of the potential energy and the total energy are respectively
A particle executes SHM with a period of $ 8\,s $ and amplitude $ 4\,cm $ . Its maximum speed in $cm/s$, is
A long magnet is cut into two equal parts, such that the length of each half is same as that of original magnet. If the period of original magnet is $T$, the period of new magnet is
In breakdown region, a Zener diode behaves as a
The coordinates of a moving particle at any time $t$ are given by $x=\alpha t^{3}$ and $y=\beta t^{3}$. The speed of the particle at time $t$ is given by
Two unlike charges of the same magnitude $Q$ are placed at a distance $d$. The intensity of the electric field at the middle point in the line joining the two charges
A heavy uniform rod is hanging vertically from a fixed support. It is stretched by its own weight. The diameter of the rod is
The refractive indices of glass and water with respect to air are $\frac{3}{2}$ and $\frac{4}{3}$ respectively. Then the refractive index of glass with respect to water is
A ball is released from the top of a tower. The ratio of work done by force of gravity in first, second and third second of the motion of the ball is
A particular force $(F)$ applied on a wire increases its length by $2 \times 10^{-3} m$. To increase the wire's length by $4 \times 10^{-3} m$ the applied force will be
The frequency of vibrating air column in closed organ pipe is n. If its length be doubled and radius halved, its frequency will be nearly
The escape velocity of a body from the earth is $v_{e}$ . If the radius of earth contracts to $ \frac{1}{4}th $ of its value, keeping the mass of the earth constant, the escape velocity will be
Two free parallel wires carrying currents in the opposite directions
Work done in converting one gram of ice at $ -10^{\circ}C $ into steam at $100^{\circ}C $ is
A body of mass $10\, kg$ is acted upon by two forces each of magnitude $10\, N$ making an angle of $60^{\circ}$ with each other. Find the net acceleration of the body.
The least angle of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is $ 1.5 $ . Then the angle of prism is
The time period of a freely suspended bar magnet in a field is $2\, \sec$. It is cut into two equal parts along its axis, (hen the time period is
A body is moving with uniform acceleration. covers $200\, m$ in the first $2\, s$ and $220\, m$ in the next $4\, s$. Find the velocity in $m / s$ after $7\, s$.
Nuclear fission can be explained based on
Two wires $A$ and $B$ are of lengths $ 40\,cm $ and $ 30\,cm $ . $A$ is bent into a circle of radius $r$ and $B$ into an arc of radius $r$. A current $i_{1}$ is passed through $A$ and $I_2$ through $B$. To have the same magnetic inductions at the centre, the ratio of $I_{1}:I_{2}$ is
The angle between magnetic meridian and geographical meridian is known as