List of top Physics Questions asked in JEE Main

A particle of mass \( m \) is at a distance \( 3R \) from the center of Earth. Find the minimum kinetic energy of the particle to leave Earth's field, where \( R \) is the radius of Earth.
In a YDSE setup, the slits are separated by 1.5 mm and the distance between the slits and the screen is 2 m. On using light of wavelength 400 nm, it is observed that 20 maxima of double slit experiment lie inside the central maxima of single slit diffraction. The width of each slit is μm.
A disc is performing pure rolling if the speed of the top point is 8 m/s. Find the speed of point B.
A composite sound wave is represented by \( y = A \cos \omega t \cdot \cos \omega' t \). The observed beat frequency is:
A lens of focal length 20 cm in air is made of glass with a refractive index of 1.6. What is its focal length when it is immersed in a liquid of refractive index 1.8?
The dimensions of a physical quantity \( \epsilon_0 \frac{d\Phi_E}{dt} \) are similar to:
In the circuit shown, assuming the threshold voltage of the diode is negligibly small, then the voltage \( V_{AB} \) is correctly represented by:
threshold voltage of the diode is negligibly small
The work function of a metal 3eV. The colour of the visible light that is required to cause emission of photo electrons is:
For a short dipole placed at origin \( O \), the dipole moment \( P \) is along the \( x \)-axis, as shown in the figure. If the electric potential and electric field at \( A \) are \( V_0 \) and \( E_0 \) respectively, then the correct combination of the electric potential and electric field, respectively, at point \( B \) on the \( y \)-axis is given by: 
short dipole placed at origin O, the dipole moment P
Find the eccentricity of the ellipse in which the length of the minor axis is equal to one fourth of the distance between foci.
Mean free path for an ideal gas is observed to be 20 μm while the average speed of molecules of gas is observed to be 600 m/s, then the frequency of collision is near?

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

A ring and a solid sphere are released from rest from the same height on enough rough inclined surface. The ratio of their speed when they reach the bottom is \( \sqrt{\frac{7}{x}} \) m/s, then \( x \) is ______.
In YDSE, light of intensity \( 4I \) and \( 9I \) passes through two slits respectively. Difference of maximum and minimum intensity of interference pattern is:
Among Sc, Ti, Mn and Co, calculate the spin-only magnetic moment in the \( +2 \) oxidation state of the metal having the highest heat of atomisation.
The ratio of intensities of two coherent sources is 1:9. The ratio of the maximum to the minimum intensities is:
In a resonance tube experiment at one end, resonance is obtained at two consecutive lengths \( l_1 = 100 \, \text{cm} \) and \( l_2 = 140 \, \text{cm} \). If the frequency of the sound is 400 Hz, the velocity of sound is:
Find out magnitude of work done in the process ABCD (in kJ).
The ratio of intensities of two coherent sources is 1:9. The ratio of the maximum to the minimum intensities is:
A particle is released from height \(s\) above the surface of the earth. At a certain height its K.E is 3 times of P.E. The height from the surface of the earth and the speed of the particle at the instant are respectively:
Two water drops each of radius \( r \) coalesce to form a bigger drop. If \( T \) is the surface tension, the surface energy released in this process is:
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 \( A \rightarrow B \rightarrow A \).
The moment of inertia of a ring of mass \( M \) and radius \( R \) about an axis passing through a tangential point in the plane of ring is:
An equilateral prism is made of a material of refractive index \( \sqrt{2} \). Find the angle of incidence for minimum deviation of the light ray.
What is the dimensional formula of \( \frac{1}{\mu_0 \epsilon_0} \) (where \( \mu_0 \) is permeability and \( \epsilon_0 \) is permittivity of free space)?