List of top Physics Questions

The dimension of \( \lambda \times t \) (decay constant \(\lambda\) multiplied by time \(t\)) is:

A wire of length 1m is clamped at half of its length. If the fundamental frequency is 3kHz, then find the velocity.

Find the frequency of the waveform shown in the graph.

If fringe width obtained in a YDSE is 1.3mm. If the whole system is dipped in a liquid of refractive index 1.3, then the new fringe width will be:

If the threshold wavelength of a metal is in the green light region, then which of the following radiation cannot cause emission of electrons from metal?

Specific heat capacity of diatomic gas at constant volume:

If a bar magnet is doped into a circular ring placed horizontally, then what change will happen?

Band gap energy of Si is:

Product of uncertainty in position (\(\Delta x\)) and uncertainty in velocity (\(\Delta v\)) has unit:

Find the pressure on an air bubble of radius \( r \) at a height \( h \) from the surface of the water.

Vibration of atoms and molecules produce electromagnetic radiation in the region of:

Relation between \(C_p\), \(C_v\) and \(R\)

Metal in Wilkinson's catalyst?

The power dissipated by a particle with constant force and constant acceleration is proportional to the:

If \( \frac{C_p}{C_v} \) is unity for a process, \( PV^{\gamma} = \text{constant} \), then the process is:

A body is rotated about a fixed axis. Which of the following is correct about angular velocity?

If a p-n junction diode is forward biased, then:

The ratio of frequency of the 3rd mode of vibration for the closed organ pipe and the open pipe of length \( L \)?

A ball of mass 10g is dropped from a height of 50m. If 30J energy is lost due to air resistance, then what is the velocity of the ball when it hits the ground?

When blue light is incident on metal surface, photoelectrons are emitted. When green light is incident, no photoelectrons are emitted. What is the number of photoelectrons emitted when yellow light is incident?

Find the magnification of a lens having focal length 5 cm (Least distance of distinct vision = 25 cm).

A body starts from rest and moves with an acceleration of \(2 \, \text{m/s}^2\) and comes to rest with a retardation of \(2 \, \text{m/s}^2\). Find the distance travelled?

3 capacitors of capacitance \( 12 \mu \text{F} \) each is connected in series. If the voltage is 12V, what charge is drawn from the cell?

If \( B = 400\sqrt{2} \sin(\omega t - kx) \), find the peak value of the magnetic field of the electromagnetic wave.

Express the final answer to the proper number of significant figures: \[ 18.0 + 11.515 + 13.2 = \ldots \]