List of top Physics Questions asked in JEE Main

In the formula, $X=3Y{Z}^2,X$ and $Z$ have dimensions of capacitance and magnetic field respectively. What are the dimensions of $\mathrm{Y}$ in the MKSQ system?

A wave in a string has amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of $128{ms}^{-1}$ and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is:

In an electromagnetic wave, the magnitude of electric and magnetic fields are 100 V/m and 0.265 A/m. The maximum energy flow is

What should be the length of a half-wave dipole antenna for a carrier wave having frequency $3\times {10}^8$ Hz?

An equilateral triangle ABC formed from a uniform wire has two small identical beads initially located at A. The triangle is set rotating about the vertical axis AO. Then the beads are released from rest simultaneously and allowed to slide down, one along AB and other along AC as shown. Neglecting frictional effects, the quantities that are conserved as the beads slide down are:

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 ${10}^4{NC}^{-1}$.

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

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.

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

Two planets of mass m₁ and m₂ are revolving around their orbits r and r₂ respectively. Angular momentum of planets are in ratio of 3 then T₁/T₂ is___
(T₁ and T₂ are periods of revolutions)

If radius of earth reduced by one fourth of its present value, then duration of days will be

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:

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.

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 convex lens has a focal length of f = 20 cm, R1 = 15 cm, R2 = 30 cm. The refractive index of the lens is \(\frac{x}{2}\) The value of x is _______ .

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.