List of top Physics Questions

Potential energy of a body of mass $1\, kg$ free to move along X-axis is given by $U(x) = \left( \frac{x^2}{2} - x \right) J .$ If the total mechanical energy of the body is $2\, J$. then the maximum speed of the body is (Assume only conservative force acts on the body)
The speed of a particle changes from $\sqrt{5} \,ms^{- 1}$ to $2 \sqrt{5} \; ms^{-1}$ in a time If the magnitude of change in its velocity is $5 \; ms^{-1}$, the angle between the initial and final velocities of the particle is
An $\alpha$-particle moves in a circular path of radius $1\, cm$ in a uniform magnetic field of $0.125\, T$. The de Broglie wavelength associated with the $\alpha$-particle is
A circular current loop of magnetic moment M is in an arbitrary orientation in an external uniform magnetic field $\overrightarrow{B}$ . The work done to rotate the loop by 30? about an axis perpendicular to its plane is
Find the height of liquid in capillary tube if surface tension of liquid is S, radius of capillary tube is r and acceleration due to gravity is g:
When an object is shot from the bottom of a long smooth inclined plane kept at an angle $60^\circ$ with horizontal, it can travel a distance $x_1$ along the plane. But when the inclination is decreased to $30^{\circ}$ and the same object is shot with the same velocity, it can travel $x_2$ distance. Then $x_1$ : $x_2$ will be:
A body weighs $200\,N$ on the surface of the earth How much will it weigh half way down to the centre of the earth ?
If same charge 'q' is placed inside a sphere and cube, having radius 1 m and side 2 m respectively. What will be the ratio of flux passing through them:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion: Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.
Reason: Orbital velocity of a satellite is greater than its escape velocity.
In the light of the above statements, choose the correct answer from the options given below
An aluminium sphere is dipped into water. Which of the following is true?
An antenna uses electromagnetic waves of frequency 5 MHz. For proper working, the size of the antenna should be
Frequency of revolution of an electron revolving in nth orbit of H-atom is proportional to
What will be the molar specific heat at constant volume of an ideal gas consisting of rigid diatomic molecules?
A particle with charge q moves with a velocity v in a direction perpendicular to the directions of uniform electric and magnetic fields, E and B respectively, which are mutually perpendicular to each other. Which one of the following gives the condition for which the particle moves undeflected in its original trajectory?
Find the current in the 8W resistance in given circuit?
A particle executes the simple harmonic motion with an amplitude $'A'$. The distance travelled by it in one periodic time is
For a transistor, the current ratio $'\beta'_{dc}$ is defined as the ratio of
A thin metal wire of length $'L'$ and uniform linear mass density $'\rho'$ is bent into a circular coil with $'O'$ as centre. The moment of inertia of a coil about the axis $XX'$ is
If $\sqrt{A^{2}+B^{2}}$ represents the magnitude of resultant of two vectors $(A + B)$ and $(A - B)$, then the angle between two vectors is
Bohr model is applied to a particle of mass $'m'$ and charge $'q'$ is moving in a plane under the influence of a transverse magnetic field $'B'$. The energy of the charged particle in the $nth$ level will be ($h =$ Planck's constant)
The dimensions of torque are same as that of
The $SI$ unit and dimensions of Stefan?s constant $\sigma$ in case of Stefan?s law of radiation is
$V$-$I$ characterstics of $LED$ is shown correctly by graph
In a hydrogen atom, an electron of charge e revolves in a orbit of radius $r$ with speed $v$. Then, magnetic moment associated with electron is
Consider the given diagram. An ideal gas is contained in a chamber (left) of volume V and is at an absolute temperature T. It is allowed to rush freely into the right chamber of volume V which is initially vacuum. The whole system is thermally isolated. What will be the final temperature of the system after the equilibrium has been attained ?