List of top Physics Questions asked in JEE Main

Find dimensions of $ \frac{A}{B} $ if $ \left( \frac{P + \frac{A^2}{B}}{\frac{1}{2} \rho v^2} \right) = \text{constant $ where $P $ = pressure, $ \rho $ = density, $ v $ = speed.}

What will be the number of significant figures in the sum of $ 2.34,\; 12.1,\; \text{and } 0.056 $?

Match the column

Match the following as per dimensional formula.

Statement–I: Time period of a simple pendulum increases if the mass of the bob is increased.
Statement–II: Time period of a simple pendulum depends only on its length and acceleration due to gravity.

A cylindrical body of mass m and cross section A is floating in a liquid of density $\rho_{L}$ such that its axis is vertical. If body is displaced by a small displacement 'x' vertically, find the time period of oscillation of the body :

Detector $ D $ moves from $ A $ to $ B $ and observes the frequencies are differing by 10 Hz. The source is emitting frequency $ f_0 $ as shown: Speed of detector is 35 times less than speed of sound. Then $ f_0 $ is.

System is released after slightly stretching it. Find angular frequency of its oscillations:

A simple pendulum of length $30$ cm makes $20$ oscillations in $10$ s on a certain planet. Another pendulum makes $40$ oscillations in $10$ s on the same planet. Find the length of the second pendulum.

A particle moves according to the equation x = Asin($\omega t$). The potential energy is maximum at time $t = \frac{T}{2\beta}$, where T is the time period of particle. Find the minimum value of $\beta$ :

During SHM, K.E. of particle in SHM varies with frequency of 176 Hz. Find the frequency of SHM of the particle.

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:

Two mechanical waves on strings of equal length ($ L $) and tension ($ T $) having linear mass density $ \mu_1/\mu_2 = 1/2 $. Find the ratio of time taken for a wave pulse to travel from one end to the other in both strings. (Ignore gravity)

A curve is given between the potential energy $U$ of a particle and its position on the $x$-axis as shown. Given: \[ \tan\theta_1 = 1,\qquad \tan\theta_2 = 3,\qquad \tan\theta_3 = -\frac{1}{2} \] If $F_{AB}$ is the force acting on the particle during motion from $A$ to $B$, similarly $F_{BC}$, $F_{CD}$ and $F_{DE}$ are the forces during $B$ to $C$, $C$ to $D$ and $D$ to $E$ respectively, arrange the magnitudes of these forces in decreasing order.

Position $ x $ of the particle of mass 2 kg varies as function of time as $ x = t^2 + t + 1 $. Find out work done on the particle from $ t_1 = 2 $ sec to $ t_2 = 3 $ sec.

A curve is given between potential energy of a particle and its position on the x-axis.

Given: $ \tan \theta_1 = 1, \, \tan \theta_2 = 3, \, \tan \theta_3 = -\frac{1}{2} $
If $ F_{AB} $ be the force acting on the particle during $ A $ to $ B $, similarly $ F_{BC}, F_{CD}, \, F_{DE} $ are the forces during $ B $ to $ C $, $ C $ to $ D $, and $ D $ to $ E $ respectively. Arrange magnitudes of these forces in decreasing order.

A body of mass 4 kg is placed on a plane at a point P having coordinate $(3,4)$ m. Under the action of force $\vec{F} = (2\hat{i} + 3\hat{j})$ N, it moves to a new point Q having coordinates $(6,10)$ m in 4 sec. The average power and instantaneous power at the end of 4 sec are in the ratio of:

A ball of mass 100 g is projected with velocity 20 m/s at $60^\circ$ with horizontal. The decrease in kinetic energy of the ball during the motion from point of projection to highest point is:

In the given situation, the force at the center on 1 kg mass is $ F_1 $. Now if $ 4m $ and $ 3m $ are interchanged, the force is $ F_2 $. Given $ \frac{F_1}{F_2} = \frac{2}{\sqrt{\alpha}} $, find $ \alpha $.

Time taken to achieve terminal velocity by a body depends on density of material ($\rho$), density of liquid ($\sigma$), radius of material (r) and viscosity of liquid ($\eta$) as $t = k\rho^a r^b \eta^c \sigma^d$. Find $\frac{b+c}{a+d}$ ?

Wave propagates whose electric field is given by $\mathbf{E} = 69 \sin(\omega t - kx)\,\hat{j}$. Find the direction of magnetic field.

Two coherent loudspeakers $L_1$ and $L_2$ are placed at a separation of $10\,\text{m}$ parallel to a wall at a distance of $40\,\text{m}$ as shown in the figure. On a width $AB$ on the wall, 10 maxima and minima are found. If the velocity of sound is $324\,\text{m s}^{-1}$, find the frequency of sound. (Given: $ \sqrt{5}=2.23 $).

Detector $D$ moves from $A$ to $B$ and observes that the frequencies differ by $10\ \text{Hz}$. The source is emitting frequency $f_0$ as shown. The speed of the detector is $35$ times less than the speed of sound. Then $f_0$ is:

Speed of sound at $T_1 = 0^\circ C$ is $V_0$ and at $T_2 = \alpha^\circ C$ speed becomes $2V_0$. Find $\alpha$:

Two tuning forks $A$ and $B$ produce $8$ beats in $2\,\text{s}$ when sounded together. The frequency of tuning fork $B$ is $380\,\text{Hz}$. If tuning fork $A$ is loaded with some wax, then they produce $4$ beats in $2\,\text{s}$. Find the original frequency of tuning fork $A$.