List of top Physics Questions

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:

When a load of $5 \,kg$ is hung on a wire then extension of $3$ metre takes place, then work done will be:

A steel wire of $1\, m$ long and $1\, mm^2$ cross section area is hanged from rigid end when weight of $1 \,kg$ is hung from it then change in length will be (for wire Youngs coefficient $ Y=2\times 10^{11}\,N/m^{2} $ ):

The ratio of escape velocity and orbital velocity of satellite revolving near the earth:

The relation between time period $(T)$ of a body and radius of circular orbit $(r)$ is:

Contact angle of kerosen oil with solid surface is:

If a convex lens is kept in water its convergent power decreases. Focal length of convex lens in water increases.

Danger signals are made of red colour. Velocity of red light is maximum and thus more visibility in dark.

A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

From the following diode circuit, which diode is in forward biased condition

The phenomenon of diffraction of light was discovered by

In a cinema hall the distance between the projector and the screen is increased by 2 %. Now the intensity of illumination of the screen