List of top Physics Questions

In n-type semiconductors, majority charge carriers are
Two identical circular loops of metal wire are lying on a table without touching each other. Loop A carries a current which increases with time. In response, the loop B
The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K. is
If the kinetic energy of one mole of an ideal gas is given as $ E=\frac{3}{2}RT $ (where 7? is the universal gas constant and T is the absolute temperature of the gas), the molar specific heat at constant pressure will be given as
A Carnot engine working between 300 K and 600 K has a work output of 800 joules per cycle. The amount of heat energy supplied from the source to the engine in each cycle is
Which one of the following statement is true?
If the speed of light [c], acceleration due to gravity [g] and pressure [P] are taken as the fundamental quantities, then the dimension of gravitational constant is
A body is moved along a straight line by a machine which delivers constant power. The distance moved by the body in time $ t $ is proportional to
During a journey from earth to moon and back, the greatest energy required from the rocket of the space ship is to overcome
An elastic string has length $ \beta $ when subjected to 5 N tension. Its length is a when tension 4 N. When subjected to a tension of 9 N, its length will become
A smooth sphere A is moving on a frictionless horizontal plane with angular velocity $?$ and centre of mass velocity v. It collides elastically and head on with an identical sphere B at rest. Neglect friction everywhere. After the collision their angular speeds are $?_A$ and $?_B$ respectively. Then,
A disc of mass M and radius R is rolling with angular speed to on a horizontal plane as shown. The magnitude of angular momentum of the disc about the origin O is
A cubical block of side a moving with velocity v on a horizontal smooth plane as shown. It hits a ridge at point O. The angular speed of the block after it hits O is
A coil of inductance 8.4 mH and resistance $ 6 \Omega$ is connected to a 12 V battery. The current in the coil is 1A at approximately the time
Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm. If yellow light is replaced by X-rays, then the observed pattern will reveal
A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat plate as shown. The observed interference fringes from this combination shall be
A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of
A charged particle is released from rest in a region of steady and uniform electric and magnetic fields which are parallel to each other. The particle will move in a
Watt per ampere is unit of:
Two like magnetic poles of strength 10 and 40 S.I. units are separated by a distance 30cm. The intensity of magnetic field is zero on the line joining them:
If the temperature of a black body increased rom $ 27{}^\circ C $ to $ 327{}^\circ C $ , the radiation emitted increases by a fraction of:
If the radius of earth is reduced by 1% without changing the mass, then change in the acceleration due to gravity will be:
At atmospheric pressure, the water boils at $ 100{}^\circ C $ . If pressure is reduced, it will boil at :
A body projected vertically upwards with a velocity u returns to the starting point in $4 s$. If $g = 10 \,m s^{-2}$, the value of $u$ in $m/s$ is
Fertile material among the following is