List of top Physics Questions

A closely wound solenoid of \(2000 \) turns and area of cross-section \(1.6 × 10^{-4}\  m^2\), carrying a current of \(4.0 \ A\), is suspended through its centre allowing it to turn in a horizontal plane. 
(a) What is the magnetic moment associated with the solenoid?
(b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of \(7.5 × 10^{-2}\  T\) is set up at an angle of \(30º\) with the axis of the solenoid?

Velocity of sound in vacuum is

A ball initially at rest, breaks into two masses m1 and m2 that move with speed 11 and v2 respectively as shown. The ratio of the kinetic energy of the right mass to the left mass is:

Which of the following is incorrect for paramagnetic materials?

The organ pipe having same length, one is open while the other is closed. Find ratio of 7th overtone of those organ pipes.

From a rectangular sheet, the shaded portion is removed. Find the co- ordinates of the center of mass after the portion has been removed.

A ball of mass 150 gm moving with speed 20m/s is catched in 0.1 sec. find the average force exerted by the hands.

In an electron and a proton are having the same kinetic energy, find the ratio of their linear momentum. (mass of electron = 9.1 x 10^-31 kg, mass of proton = 1.67 × 10^-27 kg)

Critical angle for a pair of medium is given to be 45°. Find the ratio of the refractive index of rarer to denser medium.

For the given logic circuit, the correct relation between the input (A, B) and the output (Y) is

The variation of speed (in m/s) of an object with time (in seconds) is given by the expression $V(t) = V_0 - 5t + 5t^2$

A sphere of mass m moving with constant velocity hits another stationary sphere of the same mass. If e is the coefficient of restitution, aid the ratio of velocities of the two spheres after die collision will be

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is :

Five identical convex lenses are placed one after the other in close contact. The power of this arrangement is 25 D. Then, the power of one such lens is

A point source of light is placed at focus of convex lens, then what is the shape of wave front after passing through the lens?

A gas is kept in a vessel of volume 0.2 m³ at temperature 300 K and pressure 1 bar. The molar heat capacity of gas at constant volume is 5 cal/mol K. The heat (kcal) required to raise the temperature to 400 K is ______.

Which of the following graph correctly represent the variation $\delta =\frac{dV}{VdT}$ for an ideal gas at constant pressure?

The de Broglie wavelength of an electron moving with a velocity 1.5 × 10⁸ m/s is equal to that of a photon. The ratio of the energy of the photon to the kinetic energy of the electron is ______.

As per the Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of a double ionized Li atom (Z = 3) is

A uniform solid sphere of radius $R$ has a spherical hole or radius $a$ in it. Find the position of its center of mass.

In the pure inductive circuit, the curves between frequency $f$ and reciprocal of inductive reactance $\frac{1}{X_L}$ is:

As given in the figure, a series circuit connected across a $200V,60Hz$ line consists of a capacitor of capacitive reactance $30\mathrm{\Omega }$, a non-inductive resistor of $44\mathrm{\Omega }$, and a coil of inductive resistance $90\mathrm{\Omega }$ and resistance $36\mathrm{\Omega }$. The power dissipated in the coil is?

A current i is flowing through the loop. The direction of the current and the shape of the loop are as shown in the figure.The magnetic field at the centre of the loop is, $\frac{{\mu }_{0}i}{R}$ times

[ MA = R , MB = 2R, $\angle$DMA = 90°]

A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in figure correctly shows the displacement-time curve for its motion?

The principle of superposition in wave motion tells that in a motion in which two or more waves are simultaneously producing their displacements in a particle then the resultant