List of top Physics Questions

The height from earth's surface at which acceleration due to qravity becomes g/4 is __? (Where g is acceleratio due to gravity on the surface of earth and R is radius of earth)

If an electron jumps from 3rd orbit to second orbit its wavelength is λ, then the wavelength of electron when it jumps from 4th orbit to third orbit in terms of λ is?

Water is flowing through a horizontal pipe in stream line flow. At the narrowest part of the pipe

In Young's double-slit experiment, in an interference pattern, the second minimum is observed exactly in front of one slit. The distance between the slits is $\text{d}$ and the distance between source and screen is $\text{D}$ . The wavelength of the light source used is

An electron jumps from the fourth orbit to the second orbit of hydrogen atom. If Rydberg’s constant R is equal to 10⁷ m^–1, then the frequency of the emitted radiation in Hz will be

A galvanometer has 40 divisions and a sensitivity of 12 μA/div. it can be converted into a voltmeter to read 3 V by connecting-

The voltage gain is the highest in

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is 4D, the power of a cut lens will be

Five balls numbered 1 to 5 are suspended using separate threads. The pairs of balls (1, 2), (2, 4) and (5, 1) show attraction while the pairs (2, 3) and (4, 5) show repulsion. The ball 1 is :

If momentum $(p)$, area $(A)$ and time $(t)$ are taken to be fundamental quantities, then energy has the dimensional formula

Consider a light beam incident from air to a glass slab at Brewster's angle as shown in figure. A Polaroid is placed in the path of the emergent ray at point $P$ and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.

The total energy of the body executing simple harmonic motion (SHM) is E. Then the kinetic energy when the displacement is half of the amplitude is

A rod of mass M and length L is pivoted about its end O as shown in the figure. Find the period of SHM.

A charge of $10$ $\mu C$ is brought from infinity to point $P$ in an external electric field. Point $P$ is located at a distance of $5$ cm away from $5$ $\mu C$ charge. Calculate the work done to bring the $10$ $\mu C$ to point $P$ from infinity?

A wave executes a periodic motion $y=2\sin \frac{\pi }{4}\left(4t+\frac{x}{2}\right)$. What is the frequency?

The intensity ratio of two waves is $1:9$. The ratio of their amplitudes, is

Two harmonic waves $y_1=a\cdot \sin (kx-\omega t)$ and $y_2=a\cdot \sin (kx-\omega t+\varphi )$ are moving in the same direction, if both the waves are superimposed then the initial phase angle of the resultant wave is:

How does the dynamic resistance of diode vary with temperature?

The iron blade has a ring in which the wooden handle is fixed. The ring is slightly smaller in size than a wooden handle. The ring is heated. When the ring cools, it ______________ and tightly fits on the handle.

The ionization energy of hydrogen atom in excited state is:

Two photons of same frequency are produced due to the annhiliation of a proton and antiproton. Wave length of the proton so produced is:

Wire bound resistors are made by

Read each statement below carefully and state, with reasons, if it is true or false :
(a) The net acceleration of a particle in circular motion is always along the radius of the circle towards the centre.
(b) The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point.
(c) The acceleration vector of a particle in uniform circular motion averaged over one cycle is a null vector.

A nucleus with mass number 220 initially at rest emits an $\alpha$ - particle. If the Q value of the reaction is 5.5 MeV, calculate the kinetic energy of $\alpha$-particle.

Two bodies of masses $m_1$ and $m_2$ initially at rest at infinite distance apart move towards each other under gravitational force of attraction. Their relative velocity of approach when they are separated by a distance $r$ is (G = Universal gravitational constant)