List of top Physics Questions asked in JEE Main

$\text{The fractional compression } \left( \frac{\Delta V}{V} \right) \text{ of water at the depth of } 2.5 \, \text{km below the sea level is } \_\_\_\_\_\_\_\_\_\_ \%. \text{ Given, the Bulk modulus of water } = 2 \times 10^9 \, \text{N m}^{-2}, \text{ density of water } = 10^3 \, \text{kg m}^{-3}, \text{ acceleration due to gravity } g = 10 \, \text{m s}^{-2}.$

Two projectiles are fired with the same initial speed from the same point on the ground at angles of $ (45^\circ - \alpha) $ and $ (45^\circ + \alpha) $, respectively, with the horizontal direction. The ratio of their maximum heights attained is:

The work done in an adiabatic change in an ideal gas depends upon:

At the interface between two materials having refractive indices $ n_1 $ and $ n_2 $, the critical angle for reflection of an EM wave is $ \theta_c $. The $ n_1 $ material is replaced by another material having refractive index $ n_3 $, such that the critical angle at the interface between $ n_1 $ and $ n_3 $ materials is $ \theta_{c3} $. If $ n_1 > n_2 > n_3 $, $ \frac{n_2}{n_3} = \frac{2}{5} $, and $ \sin \theta_{c2} - \sin \theta_{c1} = \frac{1}{2} $, then $ \theta_{c1} $ is:

As shown below, bob A of a pendulum having a massless string of length $ R $ is released from 60° to the vertical. It hits another bob B of half the mass that is at rest on a frictionless table in the center. Assuming elastic collision, the magnitude of the velocity of bob A after the collision will be (take $ g $ as acceleration due to gravity):

bob A of a pendulum having a massless

If $ \lambda $ and $ K $ are de Broglie wavelength and kinetic energy, respectively, of a particle with constant mass. The correct graphical representation for the particle will be:

A coil of area A and N turns is rotating with angular velocity $ \omega$ in a uniform magnetic field $\vec{B}$ about an axis perpendicular to $ \vec{B}$ Magnetic flux $\varphi \text{ and induced emf } \varepsilon \text{ across it, at an instant when } \vec{B} \text{ is parallel to the plane of the coil, are:}$

The temperature of 1 mole of an ideal monoatomic gas is increased by $ 50^\circ {C} $ at constant pressure. The total heat added and change in internal energy are $ E_1 $ and $ E_2 $, respectively. If $ \frac{E_1}{E_2} = \frac{x}{9} $, then the value of $ x $ is:

A current of 5A exists in a square loop of side $ \frac{1}{\sqrt{2}} \, {m} $. Then the magnitude of the magnetic field $ B $ at the centre of the square loop will be $ p \times 10^{-6} \, {T} $. Where, value of $ p $ is:

The least count of a screw gauge is 0.01 mm. If the pitch is increased by 75% and the number of divisions on the circular scale is reduced by 50%, the new least count will be:

A square loop of sides $ a = 1 \, {m} $ is held normally in front of a point charge $ q = 1 \, {C} $. The flux of the electric field through the shaded region is $ \frac{5}{p} \times \frac{1}{\varepsilon_0} \, {Nm}^2/{C} $, where the value of $ p $ is:

A tightly wound long solenoid carries a current of 1.5 A. An electron is executing uniform circular motion inside the solenoid with a time period of 75 ns. The number of turns per meter in the solenoid is ________________.

An ideal gas goes from an initial state to final state. During the process, the pressure of the gas increases linearly with temperature.
A. The work done by gas during the process is zero.
B. The heat added to the gas is different from the change in its internal energy.
C. The volume of the gas is increased.
D. The internal energy of the gas is increased.
E. The process is isochoric (constant volume process).
Choose the correct answer from the options given below:

A string of length $ L $ is fixed at one end and carries a mass of $ M $ at the other end. The mass makes $ \frac{3}{\pi} $ rotations per second about the vertical axis passing through the end of the string as shown. The tension in the string is ________________ ML.

The ratio of the power of a light source $ S_1 $ to that of the light source $ S_2 $ is 2. $ S_1 $ is emitting $ 2 \times 10^{15} $ photons per second at 600 nm. If the wavelength of the source $ S_2 $ is 300 nm, then the number of photons per second emitted by $ S_2 $ is ________________ $ \times 10^{14} $.

A parallel plate capacitor was made with two rectangular plates, each with a length of $ l = 3 \, {cm} $ and breadth of $ b = 1 \, {cm} $. The distance between the plates is $ d = 3 \, \mu{m} $. Out of the following, which are the ways to increase the capacitance by a factor of 10?

A. l = 30 cm, b = 1 cm, d = 1 μm
B. l = 3 cm, b = 1 cm, d = 30 μm
C. l = 6 cm, b = 5 cm, d = 3 μm
D. l = 1 cm, b = 1 cm, d = 10 μm
E. l = 5 cm, b = 2 cm, d = 1 μm

An alternating current is given by \[ I = I_A \sin \omega t + I_B \cos \omega t. \] The r.m.s. current will be:

A plano-convex lens having radius of curvature of first surface 2 cm exhibits focal length of $ f_1 $ in air. Another plano-convex lens with first surface radius of curvature 3 cm has focal length of $ f_2 $ when it is immersed in a liquid of refractive index 1.2. If both the lenses are made of the same glass of refractive index 1.5, the ratio of $ f_1 $ and $ f_2 $ will be:

A satellite is launched into a circular orbit of radius $ R $ around the earth. A second satellite is launched into an orbit of radius $ 1.03R $. The time period of revolution of the second satellite is larger than the first one approximately by:

A uniform solid cylinder of mass $ m $ and radius $ r $ rolls along an inclined rough plane of inclination $ 45^\circ $. If it starts to roll from rest from the top of the plane, then the linear acceleration of the cylinder axis will be:

A car of mass $ m $ moves on a banked road having radius $ r $ and banking angle $ \theta $. To avoid slipping from the banked road, the maximum permissible speed of the car is $ v_0 $. The coefficient of friction $ \mu $ between the wheels of the car and the banked road is:

The Young's double slit interference experiment is performed using light consisting of 480 nm and 600 nm wavelengths to form interference patterns. The least number of the bright fringes of 480 nm light that are required for the first coincidence with the bright fringes formed by 600 nm light is:

An object of mass $ m $ is projected from the origin in a vertical $ xy $-plane at an angle $ 45^\circ $ with the x-axis with an initial velocity $ v_0 $. The magnitude and direction of the angular momentum of the object with respect to the origin, when it reaches the maximum height, will be:

The amount of work done to break a big water drop of radius $ R $ into 27 small drops of equal radius is 10 J. The work done required to break the same big drop into 64 small drops of equal radius will be:

Consider the following statements:
A. The junction area of a solar cell is made very narrow compared to a photodiode.
B. Solar cells are not connected with any external bias.
C. LED is made of lightly doped p-n junction.
D. Increase of forward current results in a continuous increase in LED light intensity.
E. LEDs have to be connected in forward bias for emission of light.