List of top Physics Questions asked in JEE Main

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 :

A uniform bar of length $12\,\text{cm}$ and mass $20m$ lies on a smooth horizontal table. Two point masses $m$ and $2m$ are moving in opposite directions with the same speed $v$ and in the same plane as the bar, as shown in the figure. These masses strike the bar simultaneously and get stuck to it. After collision the entire system is rotating with angular frequency $\omega$. The ratio of $v$ and $\omega$ is

Block sliding down... moving up... distance S before stopping 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?

A simple pendulum has a bob with mass $m$ and charge $q$. The pendulum string has negligible mass. When a uniform and horizontal electric field $ \vec{E} $ is applied, the tension in the string changes. The final tension in the string, when pendulum attains an equilibrium position is _______.
($ g $: acceleration due to gravity)

Two resistors of $100\,\Omega$ each are connected in series with a $9\,\text{V}$ battery. A voltmeter of $400\,\Omega$ resistance is connected to measure the voltage drop across one of the resistors. The voltmeter reading is ___ V.

In a double slit experiment the distance between the slits is 0.1 cm and the screen is placed at 50 cm from the slits plane. When one slit is covered with a transparent sheet having thickness t and refractive index n(=1.5), the central fringe shifts by 0.2 cm. The value of t is_________ cm.

The strain-stress plot for materials A, B, C and D is shown in the figure. Which material has the largest Young's modulus?

Which one of the following is not a measurable quantity?

Consider two identical metallic spheres of radius $R$ each having charge $Q$ and mass $m$. Their centers have an initial separation of $4R$. Both the spheres are given an initial speed of $u$ towards each other. The minimum value of $u$, so that they can just touch each other is :
(Take $k = \frac{1}{4 \pi \epsilon_0}$ and assume $kQ^2>Gm^2$ where $G$ is the Gravitational constant)

Refer to the circuit diagram given below. The heat generated across the $6\ \Omega$ resistance in 100 second is $\frac{\alpha}{100}\ J$. The value of $\alpha$ is ________. (Nearest integer)

When 300 J of heat is given to an ideal gas with $ C_p = \frac{7}{2}R $, its temperature rises from 20°C to 50°C keeping its volume constant. The mass of the gas is (approximately) ______ g. (R = 8.314 J/mol K)

The figure shows a pipe with cross-section area 10 $ cm^2 $. Water flows from one end with velocity 20 cm/s. The other end of the pipe is closed and consists of 10 holes each of area 30 $ mm^2 $. Find the velocity of water coming out from each hole:

Which of the following best represents the temperature versus heat supplied graph for water, in the range of $-20^\circ\text{C}$ to $120^\circ\text{C}$?