List of top Physics Questions asked in JEE Main

In a sound wave, the displacement of the air particles follows the equation $ y = A \cos(kx - \omega t) $. What is the wave velocity?

What is the time period of a simple pendulum of length $ L $ and acceleration due to gravity $ g $?

In a resistive circuit, the power dissipated by a resistor $ R $ when a current $ I $ flows through it is given by $ P = I^2 R $. What happens to the power when the current is doubled?

A block of mass $ m $ is moving with velocity $ v $ on a smooth horizontal surface. If a constant force $ F $ is applied to the block, what is the work done by this force after 5 seconds?

In the context of the photoelectric effect, what is the threshold frequency $ f_0 $ for a metal if the work function is $ \phi = 2 \, \text{eV} $?

A uniform disk of mass $50$ $kg$ is rolling without slipping with a speed of $0.4 \;m/s$. Find minimum energy required to bring the disk to rest (in $J$).

Find percentage change in capacitance if potential difference across it has been changed from V to 2V.

With rise in temperature the young's modulus of elasticity

A bullet of mass $10^{-2}$ kg and velocity $200$ m/s gets embedded inside the bob of mass $1$ kg of a simple pendulum. The maximum height that the system rises by is_____ cm.

De Broglie wavelength of proton = $λ$ and that of an a particle $2λ$. The ratio of velocity of proton to that of $\alpha$ particle is

In the given circuit, find electric current drawn from battery :

Two resistances of 100Ω and 200Ω are connected in series with a battery of 4V and negligible internal resistance. A voltmeter is used to measure voltage across the 100Ω resistance, which gives a reading of 1V. The resistance of the voltmeter must be _____ Ω.

Two thermodynamical processes are shown in the figure. The molar heat capacity for process $ A $ and $ B $ are $ C_A $ and $ C_B $. The molar heat capacity at constant pressure and constant volume are represented by $ C_P $ and $ C_V $, respectively. Choose the correct statement.

In a double slit experiment shown in figure, when light of wavelength 400 nm is used, dark fringe is observed at P. If D = 0.2 m. the minimum distance between the slits S1 and S2 is ______ mm.

In the given figure, an ammeter $A$ consists of a $240 \, \Omega$ coil connected in parallel to a $10 \, \Omega$ shunt. The reading of the ammeter is ____ $\text{mA}$.

The density and breaking stress of a wire are $ 6 \times 10^4 \, \text{kg/m}^3 $ and $ 1.2 \times 10^8 \, \text{N/m}^2 $ respectively. The wire is suspended from a rigid support on a planet where the acceleration due to gravity is $ \frac{1}{3} $ of the value on the surface of Earth. The maximum length of the wire without breaking is ________ m (take $ g = 10 \, \text{m/s}^2 $).

The temperature of a gas having $ 2.0 \times 10^{25} $ molecules per cubic meter at 1.38 atm (Given, $ k = 1.38 \times 10^{-23} \, \text{JK}^{-1} $) is:

A body projected vertically upwards with a certain speed from the top of a tower reaches the ground in t1. If it is projected vertically downwards from the same point with the same speed, it reaches the ground in t2. Time required to reach the ground, if it is dropped from the top of the tower, is :

A gas mixture consists of 8 moles of argon and 6 moles of oxygen at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

A coil of negligible resistance is connected in series with $90 \, \Omega$ resistor across $120 \, \text{V}, \, 60 \, \text{Hz}$ supply. A voltmeter reads $36 \, \text{V}$ across resistance. Inductance of the coil is:

An astronaut takes a ball of mass $ m $ from earth to space. He throws the ball into a circular orbit about earth at an altitude of 318.5 km. From earth's surface to the orbit, the change in total mechanical energy of the ball is $ x \frac{GM_em}{21R_e} $. The value of $ x $ is
(take $ R_e = 6370 \, \text{km} $):

A ring and a solid sphere roll down the same inclined plane without slipping. They start from rest. The radii of both bodies are identical and the ratio of their kinetic energies is $ \frac{7}{x} $ where $ x $ is $\_\_\_\_\_\_\_$.

Two identical conducting spheres P and S with charge Q on each, repel each other with a force 16N. A third identical uncharged conducting sphere R is successively brought in contact with the two spheres. The new force of repulsion between P and S is :

A solid sphere of radius $4a$ units is placed with its centre at origin. Two charges $-2q$ at $(-5a, 0)$ and $5q$ at $(3a, 0)$ is placed. If the flux through the sphere is $\frac{xq}{\in_0}$ , find $x$

Three blocks M1, M2, M3 having masses 4 kg, 6 kg and 10 kg respectively are hanging from a smooth pully using rope 1, 2 and 3 as shown in figure. The tension in the rope 1, T1 when they are moving upward with acceleration of 2ms–2 is ............... N (if g = 10 m/s2 )