List of top Physics Questions asked in JEE Main

Two cars A and B are moving in the same direction along a straight line with speeds 100 km/h and 80 km/h, respectively such that car A is moving ahead of car B. A person in car B throws a stone with a speed $v$ so that it hits the car A with a speed of 5 m/s. The value of $v$ is ______ km/h.

In a microscope, the objective has a focal length $f_o=2$ cm and the eye-piece has a focal length $f_e=4$ cm. The tube length is 32 cm. The magnification produced by this microscope for normal adjustment is_____.

The two projectiles are projected with the same initial velocities at the 15° and 30° with respect to the horizontal. The ratio of their ranges is 1:x. The value of $x$ is

The magnitudes of power of a biconvex lens (refractive index $1.5$) and that of a plano-convex lens (refractive index $1.7$) are same. If the curvature of the plano-convex lens exactly matches with the curvature of the back surface of the biconvex lens, then the ratio of radii of curvature of the front and back surfaces of the biconvex lens is:

A 1 m long metal rod AB completes the circuit as shown in figure. The area of circuit is perpendicular to the magnetic field of 0.10 T. If the resistance of the total circuit is 2 $\Omega$ then the force needed to move the rod towards right with constant speed (v) of 1.5 m/s is _____ N.

Net gravitational force at the center of a square is found to be $ F_1 $ when four particles having masses $ M, 2M, 3M $ and $ 4M $ are placed at the four corners of the square as shown in figure, and it is $ F_2 $ when the positions of $ 3M $ and $ 4M $ are interchanged. The ratio $ \dfrac{F_1}{F_2} = \dfrac{\alpha}{\sqrt{5}} $. The value of $ \alpha $ is

Consider an equilateral prism (refractive index $ \sqrt{2} $). A ray of light is incident on its one surface at a certain angle $ i $. If the emergent ray is found to graze along the other surface, then the angle of refraction at the incident surface is close to

A projectile is thrown upward at an angle $60^\circ$ with the horizontal. The speed of the projectile is $20$ m/s when its direction of motion is $45^\circ$ with the horizontal. The initial speed of the projectile is ________ m/s.

There are three co-centric conducting spherical shells $A$, $B$ and $C$ of radii $a$, $b$ and $c$ respectively $(c>b>a)$ and they are charged with charges $q_1$, $q_2$ and $q_3$ respectively. The potentials of the spheres $A$, $B$ and $C$ respectively are:

Consider light travelling from a medium A to medium B separated by a plane interface. If the light undergoes total internal reflection during its travel from medium A to B and the speed of light in media A and B are $2.4 \times 10^8$ m/s and $2.7 \times 10^8$ m/s, respectively, then the value of critical angle is :

For a transparent prism, if the angle of minimum deviation is equal to its refracting angle, the refractive index $n$ of the prism satisfies:

A meter bridge with two resistances $ R_1 $ and $ R_2 $ as shown in figure was balanced (null point) at 40 cm from the point $ P $. The null point changed to 50 cm from the point $ P $, when a $ 16\,\Omega $ resistance is connected in parallel to $ R_2 $. The values of resistances $ R_1 $ and $ R_2 $ are

A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances \[ (R_1=R_2=R_3=R_4). \] When $R_3$ resistance is heated, its resistance value increases by $10%$. The potential difference $(V_a-V_b)$ after $R_3$ is heated is _______ V.

The speed of a longitudinal wave in a metallic bar is $400\,\text{m/s}$. If the density and Young’s modulus of the bar material increase by $0.5%$ and $1%$ respectively, then the speed of the wave is changed approximately to _______ m/s.

A block of mass $5$ kg is moving on an inclined plane which makes an angle of $30^\circ$ with the horizontal. The coefficient of friction between the block and the inclined plane surface is $\dfrac{\sqrt{3}}{2}$. The force to be applied on the block so that the block moves {down the plane without acceleration is ________ N. ($ g = 10 \, \text{m s}^{-2} $)}

An infinitely long straight wire carrying current $I$ is bent in a planar shape as shown in the diagram. The radius of the circular part is $r$. The magnetic field at the centre $O$ of the circular loop is :

Three parallel plate capacitors each with area $A$ and separation $d$ are filled with two dielectric ($k_1$ and $k_2$) in the following fashion. ($k_1>k_2$) Which of the following is true?