List of top Physics Questions

A ray is incident on a plane surface. If $\hat{i} + \hat{j} - \hat{k}$ represents a vector along the direction of incident ray.$\hat{i} + \hat{j} $ is a vector along normal on incident point in the plane of incident and reflected ray, then vector along the direction of reflected ray is
A circuit is made up of a resistance $1\, \Omega$ and inductance $0.01\, H$. An alternating emf of $200\, V$ at $50\,Hz$ is connected, then the phase difference between the current and the emf in the circuit is
A motor cycle is going on an overbridge of radius $R$. The driver maintains a constant speed. As the motor cycle is ascending on the overbridge, the normal force on it
A coil of inductance 300 mH and resistance 2 $\Omega$ is connected to a source of voltage 2 V. The current reaches half of its steady state value in
Hard X-rays for the study of fractures in bones should have a minimum wavelength of $10^{-11}$ m. The accelerating voltage for electrons in X-ray machine should be
Interference was observed in a chamber when air was present. Now, the chamber is evacuated and if the same light is used, a careful observation will show
A leaf which contains only green pigments, is illuminated by a laser light of wavelength 0.6328 mm. It would appear to be
The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be
The respective speeds of five molecules are 2, 1.5, 1.6, 1.6 and $1.2 \, km \, s^{-1}$, the most probable speed in ${km\, s^{-1}}$ will be
The displacement of a particle is given by $x = a_0 + \frac{a_1 t}{2} - \frac{a_2 t^2}{3}$, what is its acceletion ?

The photoelectric threshold wavelength for silver is \($\lambda_{0}$\) The energy of the electron ejected from the surface of silver by an incident wavelength \(\lambda (\lambda <\lambda _0)\)

Two thin lenses have a combined power of $+9 D$. When they are separated by a distance of $20\, cm$, their equivalent power becomes $ +\frac{27}{5} D$. Their individual powers (in diopters) are
The displacement-time graphs of two moving particles make angles of $30^{\circ}$ and $45^{\circ}$ with the time $X$ -axis The ratio of their velocities is
If the scattering intensity of a liquid is $8$ units at a wavelength of $500\, nm$, then the scattering intensity at a wavelength of $400\, nm$ will be approximately
A solid sphere of mass $m$ rolls down an inclined plane without slipping, starting from rest at the top of an inclined plane. The linear speed of the sphere at the bottom of the inclined plane is $v$. The kinetic energy of the sphere at the bottom is
Flash spectrum confirms a/an
Force $F$ on a particle moving in a straight line varies with distance $d$ as shown in figure. The work done on the particle during its displacement of $12\, m$ is
Charge $q$ is uniformly spread on a thin ring of radius $R$. The ring rotates about its axis with a uniform frequency $f\,Hz$ . The magnitude of magnetic induction at the center of the ring is
A planet moving along an elliptical orbit is closest to the sun at a distance $r_{1}$ and farthest away at a distance of $r _{2}$. If $v _{1}$ and $v _{2}$ are the linear velocities at these points respectively, then the ratio $\frac{ v _{1}}{ v _{2}}$ is:
A particle of mass $M$ is situated at the centre of a spherical shell of same mass and radius $a$. The magnitude of the gravitational potential at a point situated at $a/2$ distance from the centre, will be :

Two blocks are connected over a massless pulley as shown in figure. The mass of block A is 10 kg and the coefficient of kinetic friction is 0.2. Block A slides down the incline at constant speed. The mass of block B in kg is: 

A spherical ball is dropped in a long column of viscous liquid. The speed v of the ball as a function of time t may be best represented by 

The power dissipated in the circuit shown in the figure is 30W. The value of R is

The magnetic field at the origin due to the current flowing in the wire shown is 

A d.c. battery of V volts is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be