List of top Physics Questions

A source of sound of frequency 500Hz is moving towards an observer with velocity $30m/s$. The speed of sound is $330m/s$. The frequency heard by the observer will be:

Power supplied to a particle of mass 2 kg varies with time as $P=3t^{2}/2$ watt, where t is in seconds. If velocity at $t=0$ is zero, the velocity at $t=2$ s is:}

The magnitudes of three vectors $\vec{A}, \vec{B}$ and $\vec{C}$ are 12, 5 and 13 units respectively and $\vec{A}+\vec{B}=\vec{C}$. The angle between A and B is

The potential energy of a particle is given by $U(x)=20+(x-2)^{2}$ where U is in joules and x in meters. The minimum potential energy and the position where it occurs are:}

With what speed a body be thrown upwards so that the distances covered in the 5th second and $6^{th}$ second are equal?}

A body falling from height 'H' takes time 'T' seconds to reach the ground. The time taken to cover the second half of height is

A body of mass 1 kg starts moving from rest under the action of a force which varies with displacement as $F=2x+5$ (in newtons). The work done by this force to displace the body from $x=0$ to $x=2$ m is:

If velocity $V$, energy $E$ and time $T$ are chosen as fundamental quantities then dimensional representation of surface tension in this system will be

The ratio between maximum and minimum values of two vectors $\vec{A}$ and $\vec{B}$ ($\vec{A}>\vec{B}$) is 1:4. Then the ratio between the magnitudes of two vectors is

If $|A+B| = |A-B|$ then the angle between the two vectors $A$ and $B$ is

If $P = F \cdot v \sin \beta t$ where $F$ is force and $v$ is velocity then the dimensions of $P$ and $\beta$ are

An aeroplane is moving in a circular path with a speed of 450 Kmph. What is the change in velocity in half revolution?

What is the velocity of light in vacuum if the velocity of light in a medium of refractive index 1.2 is \( v \, ms^{-1} \)?

A rectangular coil of length 10 cm and breadth 9 cm carries a current of 10 A. A long straight conductor carrying a current of 20 A is placed 1 cm from the coil parallel to its length and in the same plane of the coil. What will be the net force acting on the straight conductor?

By connecting two given capacitors, a technician was able to make two new capacitors having the effective capacitance \( 12.5\mu F \) and \( 2\mu F \). What would be the capacitance of the given capacitors?

For a short magnet, the magnetic field on the axial line at a distance 10 cm from its centre is \( 1.6 \times 10^{-7} \, T \). What is the magnetic field on its equatorial line at the same distance 10 cm from its centre?

What is the kinetic energy of the electron in the \( n \)th level, moving in a plane under the influence of a magnetic field \( B \)? \([ m\text{ - mass of electron},\; h\text{ - Planck's constant},\; e\text{ - electronic charge}]\)

When a metallic spherical shell of radius 20 cm is charged, the potential on its surface is found to be 5 V. The potential at a point 10 cm from the centre of the spherical shell is:

What is the maximum wavelength of EM radiation required to move an electron from the valence band to conduction band of a semiconductor? [Given: Energy gap \( E_g = 1.98 \times 10^{-19} \, J \); Planck's constant \( h = 6.6 \times 10^{-34} \, Js \)]

In the Young's double slit experiment, when a monochromatic light is used, fringe width obtained is 1 mm. If the wavelength is halved and the slit width is doubled, what will be the new fringe width?

Two wires A and B made of same material having length 10 cm and 40 cm respectively are connected in parallel to the same source of emf 10 V. What will be the ratio of the drift velocity of the electrons in the wire A to the drift velocity in the wire B?

A monochromatic light of wavelength \( 6000 \, \mathring{A} \) is passed through two media A and B of thickness 10 cm and 16 cm respectively. The number of waves in A is \( \frac{1}{2} \) that of B. If the refractive index of A is \( \frac{4}{3} \), find the refractive index of B.

What should be the value of the inductance of the coil which is to be connected to \( 220 \, V, 50 \, Hz \) supply so that maximum current of \( 3\sqrt{2} \, A \) flows through the circuit?

The separation between C and O atoms in CO is \( 0.12 \, nm \). The distance of C atom from the centre of mass is

In the expression \( P = E l^2 m^{-5} G^{-2} \) where \( E, l, m \) and \( G \) represent Energy, Angular Momentum, Mass and Gravitational Constant, the dimensions of \( P \) are