List of top Physics Questions asked in JEE Main

Kirchhoff's first rule of any junction of several circuit element in an electric circuit is based on the law of conservation of:

At 16°C, two open-end organ pipes, when sounded together produce 34 beats in 2 seconds. How many beats per second will be produced if the temperature rises to 51°C? Neglect the increase in the length of the pipes.

Steam at ${100}^{\circ }C$ is passed into $1.1kg$ of water contained in calorimeter of water equivalent $0.02kg$ at ${15}^{\circ }C$ till the temperature of the calorimeter rises to ${80}^{0}C$. What is the mass of steam condensed?

A block of mass m = 5 kg is on the smooth inclined face of the wedge of mass M  = 10 kg , the inclination to the horizontal being θ = 37°.The wedge is resting on a smooth horizontal plane. Assuming the pulley P to be smooth and the string is light and inextensible. Find the acceleration of M, when M and m are always in contact.

[Given that $Sin {37}^o=\frac{3}{5}$ ]

Two thin convex lenses of focal lengths f1 and f2 are separated by a horizontal distance d (where d < f1, d < f2) and their centers are displaced by a vertical separation Δ as shown in the figure.

Taking the origin of coordinates, O at the center of the first lens, the x and y-coordinates of the focal point of this lens system, for a parallel beam of rays coming from the left, are given by

A thin concave lens is in contact with a thin convex lens. The ratio of their magnitude of the focal length is $\frac{3}{2}$ and the focal length of the combined lens is $30$ cm. The focal lengths of the individual lenses are

A compressive force, F is applied at the two ends of a long thin steel rod. It is heated, simultaneously, such that its temperature increases by ΔT. The net change in its length is zero. Let L be the length of the rod, A is its area of cross-section. Y is Young’s modulus, and α is its coefficient of linear expansion. Then, F is equal to

In Young's double-slit experiment with slit separation $0.1$ mm, one observes a bright fringe at angle $\frac{1}{4^{\circ }}$ rad by using the light of wavelength ${\lambda }_1$. When the light of wavelength ${\lambda }_2$ is used a bright fringe is seen at the same angle in the same setup. Given that $1$ and $2$ are in the visible range $(380nm$ to $740nm)$, their values are

If the resultant of the vectors shown in A√x, find x.

A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected to a 10Ω resistor as shown in the figure. The current in the 10Ω resistor is

A block of mass 5 kg is released as shown in the figure. Surface CD is rough with = 0.5, rest of all the surfaces are smooth. Find the maximum compression in the spring (initially spring is in its natural length.)

The track shown in the figure is frictionless. The block B of mass 4 kg is lying at rest and block A of mass 2 kg is pushed along the track with some speed. The collision between A and B is perfectly elastic.With what velocity should the block A start such that block B just reaches at point P?

A block of mass M slides down on a rough inclined plane with constant velocity. The angle made by the inclined plane with horizontal is θ.The magnitude of the contact force will be

A vessel contains helium, which expands at constant pressure when 15 kJ of heat is supplied to it. The work performed (in kJ) in the expansion will be ______.

In a pond of water, a flame is held 2 m above the surface of water. A fish is at depth of 4 m from water surface. Refractive index of water is $\frac{4}{3}$. The apparent height of the flame from the eyes of fish is:

Find the equivalent resistance between terminal A and B for the given network.

Which of the following is metal compound semiconductor?

In the Bohr model of the hydrogen atom, let R, V and E represent the radius of the orbit, speed of the electron and total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n ?

A body of mass 4 kg is at a height of R (radius of earth) from surface of earth. The weight of the body is ______ N.

A wave on a string is described by $u(x,t)=0.005 \sin (6.28x-314t)$ in which all quantities are in SI units. It's wavelength is _______.

In a given AC circuit consisting of a resistor R and an inductor L and source emf, two voltmeter V₁ & V₂ are connected as shown. If V₂ = 36 volts then inductance of inductor is (Resistance R is √91Ω.)

A particle oscillates in simple harmonic motion such that its speed and acceleration at distance 2 m from mean position are 4 m/s and 16 m/s² respectively. Find the amplitude of oscillation of the particle.

Which graph correctly represents the photo current (i) vs stopping potential (Vs) for the same frequency but different intensity? $(here, I_1 › I_2)$

Two persons are pulling a rope towards themselves with a force of 200 N each. If the Young's modulus is 2 x 10¹¹ N/m² and area of cross-section is 2 cm² for the rope, the elongation in the rope is ____.
(distance between the persons holding the ropes is 2 m.)

The angle of polarization of glass is 58° and that for water is 53°. The angle of polarization for glass in water is