List of top Physics Questions

Statement-1: Kinetic energy of system = \( \frac{1}{2} m_1 v_1^2 + \frac{1}{2} m_2 v_2^2 + \dots + \frac{1}{2} m_n v_n^2 \) Statement-2: Kinetic energy of system = Kinetic energy of center of mass + kinetic energy with respect to center of mass.

In hydrogen type atom, shortest wavelength in Lyman series is given as 91 nm. Then the longest wavelength in Paschen series of this atom shall be

If the string connecting \( m \) and the ground is cut, find the speed with which the \( 2m \) block hits the ground as shown. \( g = 10 \, \text{m/s}^2 \)

Choose the correct graph between time period \( T \) and length of pendulum \( l \).

For the given circuit, find the reading of the ammeter just after the key(s) is closed.

For the given arrangement of charges, find the strength of electric field \( E \) and potential \( V \) at the geometrical center \( O \).

Which of the following is/are true for YDSE experiment?

Three identical liquid drops, each carrying the same charge, coalesce to form a single drop. The ratio of the potential of the large drop and the smaller drop is \( 3^{1/3} \). Then, \( N \) is:

Find number of photons emitted per second by a light source of wavelength \(663\,\text{nm}\) at power \(6\,\text{mW}\). If \(h = 6.63 \times 10^{-34}\,\text{Js}\) is \(N \times 10^{15}\), then find \(N\).

Block of mass \(3\,\text{kg}\) is connected to a flywheel of mass \(3\,\text{kg}\) and radius \(5\,\text{m}\) through a massless string wrapped around the flywheel. Find kinetic energy (in J) of flywheel when block descends by \(3\,\text{m}\).

Find time taken by the block to reach the bottom.

For a particle moving in x-direction according to the relation \(x = 4t^3 - 3t\), consider the following statements:

[(a)] At \(t = 0.866\), \(x = 0\)
[(b)] Direction of velocity of particle remains same
[(c)] Direction of velocity of particle changes at \(x = -1\)
[(d)] Direction of velocity of particle changes at \(x = 0.5\,\text{m}\)
[(e)] Acceleration is non-negative
Correct statements are:

A current is flowing along the surface of a long solid cylinder of radius \(R\). Select the correct statement(s):

[(A)] Magnetic field (\(B\)) is minimum along the axis of cylinder
[(B)] Magnetic field (\(B\)) is minimum at the surface of cylinder
[(C)] Magnetic field (\(B\)) is maximum at the surface of cylinder
[(D)] Magnetic field (\(B\)) is maximum along the axis of cylinder
[(E)] Magnetic field (\(B\)) is same all over the cross section of cylinder

In the given circuit, energy stored in the inductor is \(16\,\text{J}\) and power dissipated in resistance is \(32\,\text{W}\). Find the value of \(\dfrac{X_L}{R}\).

A light ray incident on a slab of refractive index \( \frac{3}{2} \). If the wavelength of the refracted ray is 520 nm, find the wavelength of the incident ray.

Ice is heated from \(-20^\circ C\) to \(200^\circ C\). Which of the following temperature (T) vs heat (Q) graph is correct ?

If nothing is kept between jaws, zero of Vernier scale lies right of 0 cm of main scale and \(4^{th}\) line of Vernier scale matches perfectly with any line of main scale. An object is kept between jaws and zero of Vernier scale crosses \(15^{th}\) division of main scale and \(5^{th}\) division of Vernier scale exactly matches with any line of main scale. (Least count = 0.1 mm and 1 MSD = 1mm). Find dimension of object :

A particle is falling under gravity. Air resistance on particle is F = \(-\)kv. Find correct option :

Two wires of cross sectional area \(1 \text{ cm}^2\) and \(2 \text{ cm}^2\) and lengths 20 cm and 30 cm are connected to the same load. If their extensions are same, find the ratio of their Young's modulus :

10kg ice at \(-10^\circ C\) & 100kg water at \(25^\circ C\) are mixed together. Find final temperature. (Given \(S_{ice} = \frac{1}{2}\) cal/g\(^\circ C\), \(L_{fusion} = 80\)cal/g and \(S_{water} = 1\)cal/g\(^\circ C\))