List of top Physics Questions asked in JEE Main

A light string passing over a smooth light fixed pulley connects two blocks of masses m1 and m2. If the acceleration of the system is g/8, then the ratio of masses is

A particle of mass $ 0.50 \, \text{kg} $ executes simple harmonic motion under force $ F = -50 \, (\text{N m}^{-1}) x $. The time period of oscillation is $ \frac{x}{35} \, \text{s} $. The value of $ x $ is $ \dots \dots \dots \dots $. \[ \text{(Given } \pi = \frac{22}{7} \text{)} \]

In the truth table of the above circuit the value of X and Y are

A spherical ball of radius $ 1 \times 10^{-4} \, \text{m} $ and density $ 10^5 \, \text{kg/m}^3 $ falls freely under gravity through a distance $ h $ before entering a tank of water. If after entering in water the velocity of the ball does not change, then the value of $ h $ is approximately: \[ \text{(The coefficient of viscosity of water is } 9.8 \times 10^{-6} \, \text{N s/m}^2 \text{)} \]

A 1 kg mass is suspended from the ceiling by a rope of length 4m. A horizontal force 'F' is applied at the mid point of the rope so that the rope makes an angle of 45° with respect to the vertical axis as shown in figure. The magnitude of F is

The energy released in the fusion of 2 kg of hydrogen deep in the sun is $E_H$ and the energy released in the fission of 2 kg of $^{235}U$ is $E_U$. The ratio $\frac{E_H}{E_U}$ is approximately:

UV light of 4.13 eV is incident on a photosensitive metal surface having work function 3.13 eV. The maximum kinetic energy of ejected photoelectrons will be

A proton and a deuteron ($ q = +e, \, m = 2.0u $) having the same kinetic energies enter a region of uniform magnetic field $ \vec{B} $, moving perpendicular to $ \vec{B} $. The ratio of the radius $ r_d $ of the deuteron path to the radius $ r_p $ of the proton path is:

The effective resistance between A and B, if resistance of each resistor is R, will be

The excess pressure inside a soap bubble is thrice the excess pressure inside a second soap bubble. The ratio between the volume of the first and the second bubble is :

Two cars are travelling towards each other at a speed of $ 20 \, \text{m/s} $ each. When the cars are $ 300 \, \text{m} $ apart, both the drivers apply brakes and the cars retard at the rate of $ 2 \, \text{m/s}^2 $. The distance between them when they come to rest is:

The magnetic field in a plane electromagnetic wave is \[ B_y = (3.5 \times 10^{-7}) \sin \left( 1.5 \times 10^3 x + 0.5 \times 10^{11} t \right) \, \text{T}. \] The corresponding electric field will be:

A hydrogen atom in ground state is given an energy of 10.2 eV. How many spectral lines will be emitted due to transition of electrons ?

The temperature of a gas is $-78^\circ\text{C}$ and the average translational kinetic energy of its molecules is $ K $. The temperature at which the average translational kinetic energy of the molecules of the same gas becomes $ 2K $ is:

The following figure represents two biconvex lenses $ L_1 $ and $ L_2 $ having focal lengths 10 cm and 15 cm, respectively. The distance between $ L_1 $ and $ L_2 $ is:

A nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of 2:1. After disintegration they will move

A point source is emitting sound waves of intensity $ 16 \times 10^{-8} \, Wm^{-2} $ at the origin. The difference in intensity (magnitude only) at two points located at distances of 2 m and 4 m from the origin respectively will be _____ $ \times 10^{-8} \, Wm^{-2} $.

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 37° with each other. When suspended in a liquid of density 0.7 g/cm³, the angle remains the same. If the density of the material of the sphere is 1.4 g/cm³, the dielectric constant of the liquid is ___________. (tan 37° =$ \frac{3}{4}$)

The current of 5 A flows in a square loop of sides 1 m placed in air. The magnetic field at the center of the loop is $X\sqrt{2} \times 10^{-7} \, T$. The value of X = _________.

A vector has magnitude same as that of A = $-3\hat{i} + 4\hat{j}$ and is parallel to B = $4\hat{i} + 3\hat{j}$. The x and y components of this vector in the first quadrant are x and y respectively where:

$x = \_\_\_\_$.

Two discs of moment of inertia $ I_1 = 4 \, kg \, m^2 $ and $ I_2 = 2 \, kg \, m^2 $ about their central axes and normal to their planes, rotating with angular speeds $ 10 \, rad/s $ and $ 4 \, rad/s $ respectively are brought into contact face to face with their axes of rotation coincident. The loss in kinetic energy of the system in the process is __________ J.

A big drop is formed by coalescing 1000 small identical drops of water. If E₁ be the total surface energy of 1000 small drops of water and E₂ be the surface energy of single big drop of water, the E₁ : E₂ is x : 1 where x = ________.

A power transmission line feeds input power at 2.3 kV to a step down transformer with its primary winding having 3000 turns. The output power is delivered at 230 V by the transformer. The current in the primary of the transformer is 5A and its efficiency is 90%. The winding of transformer is made of copper. The output current of transformer is_____A.

Two particles are projected from a tower of height 400 m & angles 45° & 60° horizontally. If they have the same time of flight, find the ratio of their velocities.

Match List I with List II

Choose the correct answer from the options given below: