List of top Physics Questions asked in JEE Main

A particle moves on a circular path of radius 1 m. Find its displacement when it moves from $ A \rightarrow B \rightarrow A $. Also, its distance are it moves from $ A \rightarrow B \rightarrow A $.

Earth has mass 8 times and radius 2 times that of a planet. If the escape velocity from the earth is 11.2 km/s, the escape velocity in km/s from the planet will be:

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Knowing initial position $ x_0 $, and initial momentum $ p_0 $ is enough to determine the position and momentum at any time $ t $ for a simple harmonic motion with a given angular frequency $ \omega $.
Reason (R): The amplitude and phase can be expressed in terms of $ x_0 $ and $ p_0 $.
In the light of the above statements, choose the correct answer from the options given below:

A particle is subjected to simple harmonic motions as: $ x_1 = \sqrt{7} \sin 5t \, \text{cm} $ $ x_2 = 2 \sqrt{7} \sin \left( 5t + \frac{\pi}{3} \right) \, \text{cm} $ where $ x $ is displacement and $ t $ is time in seconds. The maximum acceleration of the particle is $ x \times 10^{-2} \, \text{m/s}^2 $. The value of $ x $ is:

Find output voltage in the given circuit.

A uniform magnetic field of $ 0.4 $ T acts perpendicular to a circular copper disc $ 20 $ cm in radius. The disc is having a uniform angular velocity of $ 10\pi $ rad/s about an axis through its center and perpendicular to the disc. What is the potential difference developed between the axis of the disc and the rim? ($\pi = 3.14$)

The equation of a wave travelling on a string is $ y = \sin[20\pi x + 10\pi t] $, where x and t are distance and time in SI units. The minimum distance between two points having the same oscillating speed is :

A ball having kinetic energy $ KE $, is projected at an angle of $ 60^\circ $ from the horizontal. What will be the kinetic energy of the ball at the highest point of its flight?

In the context of the photoelectric effect, what is the threshold frequency $ f_0 $ for a metal if the work function is $ \phi = 2 \, \text{eV} $?

A positive ion A and a negative ion B has charges $6.67 \times 10^{-19}$ C and $9.6 \times 10^{-10}$ C, and masses $19.2 \times 10^{-27}$ kg and $9 \times 10^{-27}$ kg respectively. At an instant, the ions are separated by a certain distance $r$. At that instant, the ratio of the magnitudes of electrostatic force to gravitational force is $P \times 10^{-13}$, where the value of $P$ is:

Given a charge $ q $, current $ I $ and permeability of vacuum $ \mu_0 $. Which of the following quantity has the dimension of momentum?

A capillary tube of radius 0.1 mm is partly dipped in water (surface tension 70 dyn/cm and glass water contact angle $ \approx 0^\circ $) with $ 30^\circ $ inclined with vertical. The length of water risen in the capillary is ____ cm. (Take $ g = 9.8 $ m/s$^2 $)

The kinetic energy of translation of the molecules in 50 g of CO$_2$ gas at 17°C is:

In the experiment for measurement of viscosity $ \eta $ of a given liquid with a ball having radius $ R $, consider following statements: A. Graph between terminal velocity $ V $ and $ R $ will be a parabola.
B. The terminal velocities of different diameter balls are constant for a given liquid.
C. Measurement of terminal velocity is dependent on the temperature.
D. This experiment can be utilized to assess the density of a given liquid.
E. If balls are dropped with some initial speed, the value of $ \eta $ will change.

A coil of area A and N turns is rotating with angular velocity $ \omega$ in a uniform magnetic field $\vec{B}$ about an axis perpendicular to $ \vec{B}$ Magnetic flux $\varphi \text{ and induced emf } \varepsilon \text{ across it, at an instant when } \vec{B} \text{ is parallel to the plane of the coil, are:}$

A force $ \mathbf{F} = 2\hat{i} + 3\hat{j} + 5\hat{k} $ acts on a particle moving in the direction of $ \mathbf{r} = 2\hat{i} + 3\hat{j} + \beta \hat{k} $. Find the value of $ \beta $ when the work done is zero.

A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of 800 $ cm^3 $ and temperature 27°C. The change in temperature when the gas is adiabatically compressed to 200 $ cm^3 $ is: (Take $ \gamma $ = 1.5 : $ \gamma $ is the ratio of specific heats at constant pressure and at constant volume)

A light wave is propagating with plane wave fronts of the type $ x + y + z = \text{constant} $. The angle made by the direction of wave propagation with the $ x $-axis is:

Find the equivalent capacitance between A and B, where $ C = 16 \, \mu F $.

A plane electromagnetic wave of frequency 20 MHz travels in free space along the +x direction. At a particular point in space and time, the electric field vector of the wave is $ E_y = 9.3 \, \text{V/m} $. Then, the magnetic field vector of the wave at that point is:

Which of the following circuits represents a forward biased diode?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance.
Reason (R): A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation.
In light of the above statements, choose the most appropriate answer from the options given below:

Electric flux $ \varphi $ is related with linear charge density $ \lambda $ and surface charge density $ \sigma $ as $ \varphi = \alpha \lambda + \beta \sigma $. Where $ \alpha $ and $ \beta $ are of appropriate dimension. The dimension of $ \frac{\beta}{\alpha} $ is:

Three infinitely long wires with linear charge density $ \lambda $ are placed along the x-axis, y-axis and z-axis respectively. Which of the following denotes an equipotential surface?

The output of the circuit is low (zero) for:

(A) $ X = 0, Y = 0 $
(B) $ X = 0, Y = 1 $
(C) $ X = 1, Y = 0 $
(D) $ X = 1, Y = 1 $
Choose the correct answer from the options given below: