List of top Physics Questions asked in JEE Main

The charge stored by the capacitor C in the given circuit in the steady state is _________ $\mu$C.

A battery with EMF $E$ and internal resistance $r$ is connected across a resistance $R$. The power consumption in $R$ will be maximum when :

The pulley shown in figure is made using a thin rim and two rods of length equal to diameter of the rim. The rim and each rod have a mass of $M$. Two blocks of mass of $M$ and $m$ are attached to two ends of a light string passing over the pulley, which is hinged to rotate freely in vertical plane about its center. The magnitudes of the acceleration experienced by the blocks is _________ (assume no slipping of string on pulley).

An electromagnetic wave of frequency 100 MHz propagates through a medium of conductivity, $\sigma = 10$ mho/m. The ratio of maximum conduction current density to maximum displacement current density is _________.
$\left[ \text{Take } \frac{1}{4\pi\epsilon_0} = 9 \times 10^9 \text{ Nm}^2/\text{C}^2 \right]$

A diatomic gas ($\gamma = 1.4$) does 100 J of work when it is expanded isobarically. Then the heat given to the gas is _________ J.

In a Young's double slit experiment set up, the two slits are kept 0.4 mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness 20 $\mu$m is introduced in front of one of the slits then center bright fringe shifts by 20 mm on the screen. The refractive index of transparent sheet is given by $\frac{\alpha{10}$, where $\alpha$ is _________}.

A point charge $q = 1\,\mu\text{C}$ is located at a distance $2\,\text{cm}$ from one end of a thin insulating wire of length $10\,\text{cm}$ having a charge $Q = 24\,\mu\text{C}$, distributed uniformly along its length, as shown in the figure. Force between $q$ and wire is ________ N.

A particle having electric charge $3 \times 10^{-19}$ C and mass $6 \times 10^{-27}$ kg is accelerated by applying an electric potential of 1.21 V. Wavelength of the matter wave associated with the particle is $\alpha \times 10^{-12}$ m. The value of $\alpha$ is _________. (Take Planck's constant $= 6.6 \times 10^{-34}$ J.s)

The terminal velocity of a metallic ball of radius 6 mm in a viscous fluid is 20 cm/s. The terminal velocity of another ball of same material and having radius 3 mm in the same fluid will be _________ cm/s.

An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30$^\circ$C. The coefficient of linear expansion of aluminium and steel are $24 \times 10^{-6}$/$^\circ$C and $1.2 \times 10^{-5}$/$^\circ$C, respectively. The length of this composite rod when its temperature is raised to 100$^\circ$C, is________ cm.

A parallel plate capacitor has capacitance C, when there is vacuum within the parallel plates. A sheet having thickness $ \frac{1}{3}d $ of the separation between the plates and relative permittivity K is introduced between the plates. The new capacitance of the system is:

In an experiment the values of two spring constants were measured as $k_1 = (10 \pm 0.2)$ N/m and $k_2 = (20 \pm 0.3)$ N/m. If these springs are connected in parallel, then the percentage error in equivalent spring constant is:

A uniform solid cylinder of length $L$ and radius $R$ has moment of inertia about its axis equal to $I_1$. A small co-centric cylinder of length $L/2$ and radius $R/3$ carved from it has moment of inertia about its axis equal to $I_2$. The ratio $I_1/I_2$ is ________.

Potential energy (V) versus distance (x) is given by the graph. Rank various regions as per the magnitudes of the force (F) acting on a particle from high to low.

Consider a modified Bernoulli equation. \[ P + \frac{A}{Bt^2} + \rho g(h + Bt) + \frac{1}{2} \rho v^2 = \text{constant} \] If t has the dimension of time then the dimensions of A and B are_________ respectively.

A soap bubble of surface tension $0.04\,\text{N/m}$ is blown to a diameter of $7\,\text{cm}$. If $(15000 - x)\,\mu\text{J}$ of work is done in blowing it further to make its diameter $14\,\text{cm}$ $(\pi = 22/7)$, then the value of $x$ is ________.

The electric field in a plane electromagnetic wave is given by : $ E_y = 69 \sin[0.6 \times 10^3 x - 1.8 \times 10^{11} t] $ V/m. The expression for magnetic field associated with this electromagnetic wave is_________ T.

A thin uniform rod ($X$) of mass $M$ and length $L$ is pivoted at a height $ \left(\dfrac{L}{3}\right) $ as shown in the figure. The rod is allowed to fall from a vertical position and lie horizontally on the table. The angular velocity of this rod when it hits the table top is ________. ($g$ = gravitational acceleration)

A uniform rod of mass m and length l suspended by means of two identical inextensible light strings as shown in figure. Tension in one string immediately after the other string is cut, is _______ (g = acceleration due to gravity).

A gas based geyser heats water flowing at the rate of 5.0 litres per minute from 27 °C to 87 °C. The rate of consumption of the gas is_________ g/s. (Take heat of combustion of gas = $5.0 \times 10^4$ J/g, specific heat capacity of water = 4200 J/kg.°C).

A current carrying solenoid is placed vertically and a particle of mass m with charge Q is released from rest. The particle moves along the axis of solenoid. If g is acceleration due to gravity then the acceleration (a) of the charged particle will satisfy:

Water flows through a horizontal tube as shown in the figure. The difference in height between the water columns in vertical tubes is 5 cm and the area of cross-sections at A and B are 6 cm$^2$ and 3 cm$^2$ respectively. The rate of flow will be ______ cm$^3$/s. (take g = 10 m/s$^2$).

The reading of the ammeter ($A$) in steady state in the following circuit (assuming negligible internal resistance of the ammeter) is ________ A.

A cubical block of density $ \rho_b = 600\,\text{kg/m}^3 $ floats in a liquid of density $ \rho_l = 900\,\text{kg/m}^3 $. If the height of block is $H = 8.0\,\text{cm}$, then height of the submerged part is ________ cm.

In the Young's double slit experiment the intensity produced by each one of the individual slits is $I_0$. The distance between two slits is $2\,\text{mm}$. The distance of screen from slits is $10\,\text{m}$. The wavelength of light is $6000\,\text{\AA}$. The intensity of light on the screen in front of one of the slits is ________.