List of top Physics Questions

The time period of an artificial satellite in a circular orbit is independent of

Two waves $ y=0.25\text{ }sin\,316t $ and $ y=0.25\,\sin 310\,t $ are travelling in same direction. The number of beats produced per second will be :

A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens will be:

Half lives of two radioactive substances A and B are respectively 20 minute and 40 minute. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio remains in number of A and B nuclei is.

The wavelength of the energy emitted when electron come from fourth orbit to second orbit in hydrogen is $ 20,397\text{ }c{{m}^{-1}} $ . The wavelength of energy for the same transition in He+ is :

A uniform chain of length L and mass M is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If g is the acceleration due to gravity, the work required to pull the hanging part on to the table is:

In Youngs double slit experiment, a mica slit of thickness t and refractive index $ \mu $ is introduced in the ray from the first source $ {{S}_{1.}} $ . By how much distance the fringes pattern will be displaced?

A diverging beam of light from a point source S having divergence angle $\alpha$ falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and its refractive index is n, then the divergence angle of the emergent beam is

A rectangular glass slab ABCD of refractive index $n_1$ is A rectangular glass slab ABCD of refractive index $n_2(n_1 > n_2)$ A ray of light is incident at the surface AB of the slab as shown. The maximum value of the angle of incidence $\alpha_{max}$ such that the ray comes out only from the other surface CD, is given by

The time period of a simple pendulum at the centre of the earth is

The intensity of radiation emitted by the sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like black bodies, then the ratio of the surface temperature of the sun and north star is:

The equations of two waves acting in perpendicular directions are given as$x=a \cos(\omega t+\delta)$ and $y=a \cos(\omega t+\alpha),$ where $\delta=\alpha+\frac{\pi}{2}, $ the resultant wave represents

Ratio of intensities of two waves is $9 : 1$. If these two are superimposed, what is the ratio of maximum and minimum intensities?

Monochromatic light is refracted from air into the glass of refractive index $ \mu $ . The ratio of the wavelength of incident and refracted waves is:

If applied torque on a system is zero, i.e., $ \tau =0 $ , then for that system:

A spring 40 mm long is stretched by the application of a force. If 10 N force is required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is:

A relay satellite transmits the television programme from one part of the world to another part continuously because its period

The tidal waves in the sea are primarily due to

If the pressure amplitude in a sound wave is tripled, then the intensity of sound is increased by a factor of:

Half life of a substance is $20$ minutes. What is the time between $33\%$ decay and $67\%$ decay?

Eddy currents are produced when

If solid sphere and solid cylinder of same mass and density rotate about their own axis, the moment of inertia will be greater for:

Reason for weightlessness in satellite:

A satellite of mass $ m_{s} $ is moving in an orbit of radius $R$, then its angular momentum:

True relation for triode valve is: