List of top Physics Questions asked in JEE Main

A mass of 1 kg is kept on a inclined plane with $30^\circ$ inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s. The work done by the frictional force in time 2 s is \dots J. (Take $g = 10 \text{ m/s}^2$)

A wheel initially at rest is subjected to a uniform angular acceleration about its axis. In the first 2 s it rotates through an angle $\theta_1$ and in the next 2 s it rotates through an angle $\theta_2$. The ratio $\frac{\theta_2}{\theta_1}$ is :

A thin convex lens and a thin concave lens are kept in contact and are co-axial. Which of the following statements is correct for this combination of two lenses ?

Incident ray is along $3\hat i-2\hat j$ and refracted ray is along $c\hat i-4\hat j$. Find $c$.

The stress v/s strain graph of a material is as shown. Find the Young's modulus of the material.

A closed tube filled with ideal gas is rotating with angular speed $\omega$ about an axis passing through end $A$. Find the pressure at the other end $B$. ($M$ is the molar mass of the gas, $\ell$ is the length of the tube and $T$ is the temperature of the gas.) Given pressure at $A$ is $P_A$.

The two wires $A$ and $B$ of equal cross-section but of different materials are joined together. The ratio of Young's modulus of wire $A$ and wire $B$ is $20/11$. When the joined wire is kept under certain tension the elongations in the wires $A$ and $B$ are equal. If the length of wire $A$ is $2.2\text{ m}$, then the length of wire $B$ is _______ $\text{m}$.

There are two spring–block systems as shown. They are in equilibrium. If $\dfrac{m_1}{m_2}=\alpha$ and $\dfrac{k_1}{k_2}=\beta$, then the ratio of the energies of the springs $\left(\dfrac{E_1}{E_2}\right)$ is:

Side of square is $ L $ and $ R \ll L $.
Find mutual inductance of the system shown in the figure.

Two blocks ($P$ and $Q$) with respectively masses $2\text{ kg}$ and $1.5\text{ kg}$ are joined by a massless thread. These blocks are mounted on a frictionless pully which is fixed on the edge of a cube $(S)$, as shown in the figure below. Block $P$ is positioned on the top surface which has no friction and block $Q$ is in contact with side-surface, having coefficient friction $\mu$. The cube $(S)$ moves towards the right with acceleration of $\frac{g}{2}$, where $g$ is gravitational acceleration. During this movement the block $P$ and $Q$ remain stationary. The value of $\mu$ is ______. (take $g = 10\text{ m/s}^2$)

1 mole of ideal diatomic gas is enclosed in a cylinder piston arrangement having cross-sectional area of piston $4\,\text{cm}^2$. If gas has only rotational modes and $P_{atm}=100\ \text{kPa}$, some amount of heat is added to the system as a result piston moves up slowly by $2.5\,\text{cm}$. If temperature change is $1.2^\circ C$. Find heat given to gas.

A spring of spring constant K = 15 N/m is cut into two parts of ratio of length 3 : 1. Find the spring constant of spring with smaller length (in N/m).

Ratio of de-Broglie wavelengths of a proton and an alpha particle accelerated through the same potential is:

Two capacitors $ C $ and $ 2C $ charged to $ V $ and $ 2V $ respectively are connected in parallel with opposite polarity. The common potential is:

Minimum deviation for an equilateral prism is 30°, refractive index is:

An object is being dropped from a height $h$ above the ground. Apart from the force of gravity, an additional drag force $F=-kv$ acts on the object. Find the correct graph of velocity $v$ versus time $t$.

In a YDSE set up, a slab of width $ t $ is inserted in front of one slit. The interference pattern shifts by 0.2 cm on the screen. If the refractive index of the slab is 1.5, then $ t $ in $ \mu m $ (screen distance 50 cm and slits separation 1 mm) then $ N $ is ..............

Velocity of particle varies with position as shown in figure. Find the correct variation of acceleration with position.

A solenoid having length 30 cm. If there are 10 turns/cm and current through solenoid changes from 2A to 4A in 3.14 sec. Find emf induced. (Area is A)

Find dipole moment of a system consisting of charge $q_1 = 3\,\mu C$ and $q_2 = -9\,\mu C$ with position coordinates $\vec r_1 = 2\hat i + 3\hat j + 3\hat k$ and $\vec r_2 = \hat i + \hat j + \hat k$ respectively.

A screw gauge has a pitch of 0.1 mm and 100 divisions on its circular scale. When its both jaws touch, the fifth division of its circular scale coincides with zero. When a sphere is placed between the jaws, the reading of the linear scale is 5 mm and the 50th division of the circular scale coincides with zero of the main scale. Find the diameter of the sphere.

The maximum rated power of the LED is $2 \text{ mW}$ and it is used in the circuit with input voltage of $5 \text{ V}$ as shown in the figure below. The current through resistance $R$ is $0.5 \text{ mA}$. The minimum value of the resistance $R_s$, to ensure that the LED is not damaged is ______ $\text{k}\Omega$.

In the provided circuit, the input voltage is $5 \text{ V}$, a series resistor $R_s$ is connected, and the circuit then branches into two parallel paths: one with a resistor $R = 1 \text{ k}\Omega$ in series with a Zener diode, and another with the LED.

Find speed given to particle at lowest point so that tension in string at point A becomes zero.

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)

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: