List of top Physics Questions asked in JEE Main

A galvanometer having a coil of resistance 30 $ \Omega $ needs 20 mA of current for full-scale deflection. If a maximum current of 3 A is to be measured using this galvanometer, the resistance of the shunt to be added to the galvanometer should be $ X \, \Omega $, where $ X $ is:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : If Young’s double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer.
Reason (R) : The speed of light reduces in an optically denser medium than air while its frequency does not change.
In the light of the above statements, choose the most appropriate answer from the options given below :

The increase in pressure required to decrease the volume of a water sample by 0.2percentage is $ P \times 10^5 \, \text{Nm}^{-2} $. Bulk modulus of water is $ 2.15 \times 10^9 \, \text{Nm}^{-2} $. The value of $ P $ is ________________.

The motion of an airplane is represented by the velocity-time graph as shown below. The distance covered by the airplane in the first 30.5 seconds is km.

A force $ \mathbf{F} = 2\hat{i} + b\hat{j} + \hat{k} $ is applied on a particle and it undergoes a displacement $ \mathbf{r} = \hat{i} - 2\hat{j} - \hat{k} $. What will be the value of $ b $, if the work done on the particle is zero?

The velocity-time graph of an object moving along a straight line is shown in the figure. What is the distance covered by the object between $ t = 0 $ to $ t = 4s $?

The value of current $ I $ in the electrical circuit as given below, when the potential at $ A $ is equal to the potential at $ B $, will be ________________________ A.

A bob of mass $m$ is suspended at a point $O$ by a light string of length $l$ and left to perform vertical motion (circular) as shown in the figure. Initially, by applying horizontal velocity $v_0$ at the point ‘A’, the string becomes slack when the bob reaches at the point ‘D’. The ratio of the kinetic energy of the bob at the points B and C is:

A bar magnet has total length $ 2l = 20 $ units and the field point $ P $ is at a distance $ d = 10 $ units from the centre of the magnet. If the relative uncertainty of length measurement is 1%, then the uncertainty of the magnetic field at point P is:

A force of 49 N acts tangentially at the highest point of a sphere (solid of mass 20 kg) kept on a rough horizontal plane. If the sphere rolls without slipping, then the acceleration of the center of the sphere is:

The expression given below shows the variation of velocity $ v $ with time $ t $: \[ v = At^2 + \frac{Bt}{C + t}. \] The dimension of $ ABC $ is:

Three infinitely long wires with linear charge density $ \lambda $ are placed along the x-axis, y-axis and z-axis respectively. Which of the following denotes an equipotential surface?

A light source of wavelength $ \lambda $ illuminates a metal surface, and electrons are ejected with a maximum kinetic energy of 2 eV. If the same surface is illuminated by a light source of wavelength $ \frac{\lambda}{2} $, then the maximum kinetic energy of ejected electrons will be (The work function of the metal is 1 eV).

An electric dipole of dipole moment $6 \times 10^{-6} $ Cm is placed in a uniform electric field of magnitude $10^6$ V/m. Initially, the dipole moment is parallel to the electric field. The work that needs to be done on the dipole to make its dipole moment opposite to the field will be ________________________ J.

Two particles are located at equal distance from origin. The position vectors of those are represented by $ \vec{A} = 2\hat{i} + 3\hat{j} + 2\hat{k} $ and $ \vec{B} = 2\hat{i} - 2\hat{j} + 4\hat{k} $, respectively. If both the vectors are at right angle to each other, the value of $ n^{-1} $ is:

The electrostatic potential on the surface of a uniformly charged spherical shell of radius $ R = 10 \, \text{cm} $ is 120 V. The potential at the centre of the shell, at a distance 5 cm from the centre, and at a distance 15 cm from the centre of the shell are:

The velocity-time graph of an object moving along a straight line is shown in the figure. What is the distance covered by the object between $ t = 0 $ to $ t = 4s $?

A particle of mass $ m $ and charge $ q $ is fastened to one end $ A $ of a massless string having equilibrium length $ l $, whose other end is fixed at point $ O $. The whole system is placed on a frictionless horizontal plane and is initially at rest. If a uniform electric field is switched on along the direction as shown in the figure, then the speed of the particle when it crosses the x-axis is:

A spherical surface separates two media of refractive indices $ n_1 = 1 $ and $ n_2 = 1.5 $ as shown in the figure. Distance of the image of an object $ O $, if $ C $ is the center of curvature of the spherical surface and $ R $ is the radius of curvature, is:

Which one of the following forces cannot be expressed in terms of potential energy?

A positive ion A and a negative ion B has charges $6.67 \times 10^{-19}$ C and $9.6 \times 10^{-10}$ C, and masses $19.2 \times 10^{-27}$ kg and $9 \times 10^{-27}$ kg respectively. At an instant, the ions are separated by a certain distance $r$. At that instant, the ratio of the magnitudes of electrostatic force to gravitational force is $P \times 10^{-13}$, where the value of $P$ is:

From the combination of resistors with resistance values $ R_1 = R_2 = R_3 = 5 \, \Omega $ and $ R_4 = 10 \, \Omega $, which of the following combination is the best circuit to get an equivalent resistance of 6 $ \Omega $?

The moment of inertia of a uniform rod of mass $ m $ and length $ l $ is $ \alpha $ when rotated about an axis passing through the centre and perpendicular to the length. If the rod is broken into equal halves and arranged as shown, then the moment of inertia about the given axis is:

In the given circuit the sliding contact is pulled outwards such that the electric current in the circuit changes at the rate of 8 A/s. At an instant when R is 12 Ω, the value of the current in the circuit will be A.

An electric dipole of mass $ m $, charge $ q $, and length $ l $ is placed in a uniform electric field $ E = E_0 \hat{i} $. When the dipole is rotated slightly from its equilibrium position and released, the time period of its oscillations will be: