List of top Physics Questions asked in JEE Main

Four particles each of mass 1 kg are placed at four corners of a square of side 2 m. Moment of inertia of system about an axis perpendicular to its plane and passing through one of its vertices is _____ kgm².

In a nuclear fission process, a high mass nuclide (A ≈ 236) with binding energy 7.6 MeV/Nucleon dissociated into middle mass nuclides (A ≈ 118), having binding energy of 8.6 MeV/Nucleon. The energy released in the process would be ____ MeV.

A particle executes simple harmonic motion with an amplitude of 4 cm. At the mean position, the velocity of the particle is 10 cm/s. The distance of the particle from the mean position when its speed becomes 5 cm/s is $ \sqrt{\alpha} $ cm, where $\alpha$ = ______

Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is 5.0 cm. The magnitude of the magnetic field at a point P midway between the wires is ____ μT
(Given: $\mu_0 = 4\pi \times 10^{-7} \, \text{TmA}^{-1}$)

If the average depth of an ocean is 4000 m and the bulk modulus of water is $ 2 \times 10^9 \, \text{N/m}^2 $, then the fractional compression $ \frac{\Delta V}{V} $ of water at the bottom of the ocean is $ \alpha \times 10^{-2} $. The value of $ \alpha $ is ______ (Given $ g = 10 \, \text{m/s}^2 $, $ p = 1000 \, \text{kg/m}^3 $).

An electron is moving under the influence of the electric field of a uniformly charged infinite plane sheet $ S $ having surface charge density $ +\sigma $. The electron at $ t = 0 $ is at a distance of 1 m from $ S $ and has a speed of 1 m/s. The maximum value of $ \sigma $ if the electron strikes $ S $ at $ t = 1 \, \text{s} $ is $ \alpha \left[ \frac{m \epsilon_0}{e} \right] \frac{\text{C}}{\text{m}^2} $. The value of $ \alpha $ is ______.

A particle starts from origin at $ t = 0 $ with a velocity $ 5\hat{i} \, \text{m/s} $ and moves in the $ x$-$ y $ plane under the action of a force that produces a constant acceleration of $ (3\hat{i} + 2\hat{j}) \, \text{m/s}^2 $. If the $ x $-coordinate of the particle at that instant is 84 m, then the speed of the particle at this time is $ \sqrt{\alpha} \, \text{m/s} $. The value of $ \alpha $ is ______.

The average kinetic energy of a monatomic molecule is 0.414 eV at temperature: (Use $ k_B = 1.38 \times 10^{-23} \, \text{J/mol-K} $)

A wire of resistance $ R $ and length $ L $ is cut into 5 equal parts. If these parts are joined in parallel, then the resultant resistance will be:

A wire of length 10 cm and radius $ \sqrt{7} \times 10^{-4} \, m $ is connected across the right gap of a meter bridge. When a resistance of 4.5 $ \Omega $ is connected on the left gap by using a resistance box, the balance length is found to be at 60 cm from the left end. If the resistivity of the wire is $ R \times 10^{-7} \, \Omega \, m $, then the value of $ R $ is:

An electric charge $10^{-6} \, \mu C$ is placed at the origin (0, 0) of an X-Y coordinate system. Two points P and Q are situated at $(\sqrt{3}, \sqrt{3}) \, \text{mm}$ and $(\sqrt{6}, 0) \, \text{mm}$ respectively. The potential difference between the points P and Q will be:

The radius of the third stationary orbit of an electron in Bohr's atom is $ R $. The radius of the fourth stationary orbit will be:

Identify the physical quantity that cannot be measured using a spherometer:

Which of the following circuits is reverse-biased?

A series $ L, R $ circuit connected with an AC source $ E = (25 \sin 1000 \, t) \, \text{V} $ has a power factor of $ \frac{1}{\sqrt{2}} $. If the source of emf is changed to $ E = (20 \sin 2000 \, t) \, \text{V} $, the new power factor of the circuit will be:

A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $ \vec{E} $ and $ \vec{B} $ represent the electric and magnetic fields respectively, then the region of space may have:
(A) $ \vec{E} = 0, \vec{B} = 0 $
(B) $ \vec{E} = 0, \vec{B} \neq 0 $
(C) $ \vec{E} \neq 0, \vec{B} = 0 $
(D) $ \vec{E} \neq 0, \vec{B} \neq 0 $
Choose the most appropriate answer from the options given below:

If the refractive index of the material of a prism is $cot\bigg(\frac{A}{2}\bigg)$, where A is the angle of the prism, then the angle of minimum deviation will be:

Position of an ant $ S $ (in meters) moving in the Y-Z plane is given by $ S = 2t \hat{j} + 5t \hat{k} $ (where $ t $ is in seconds). The magnitude and direction of velocity of the ant at $ t = 1 \, s $ will be:

In a test experiment on a model aeroplane in wind tunnel, the flow speeds on the upper and lower surfaces of the wings are 70 ms^–1and 65 ms^–1 respectively. If the wing area is 2 m2 the lift of the wing is _______ N.
(Given density of air = 1.2 kg m^-3)

The distance between object and its two times magnified real image as produced by a convex lens is 45 cm. The focal length of the lens used is ______ cm.

Each of three blocks $ P $, $ Q $, and $ R $ shown in the figure has a mass of 3 kg. Each of the wires $ A $ and $ B $ has a cross-sectional area of 0.005 cm$^2$ and Young's modulus $ 2 \times 10^{11} \, \text{N} \, \text{m}^{-2} $. Neglecting friction, the longitudinal strain on wire $ B $ is $ \ldots \times 10^{-4} $. (Take $ g = 10 \, \text{m/s}^2 $)