List of top Physics Questions

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
A circular loop of radius R, carrying current I, lies in x-y plane with its centre at origin. The total magnetic flux through x-y plane is
The critical angle for glass-water boundary is C. If $ {{\mu }_{g}}=1.5 $ 1.5 and $ {{\mu }_{\omega }}=\frac{4}{3} $ then the value of C is:
When the wavelength of light coming from a distant star is measured it is found shifted towards red. Then the conclusion is:
Hot water kept in a beaker placed in a room cools from $ 70{}^\circ C $ to $ 60{}^\circ C $ in 4 minutes. The time taken by it to cool from $ 69{}^\circ C $ to $ ~59{}^\circ C $ will be:
When light of wavelength $ \lambda $ falls on a thin film of thick- ness t and refractive index n, the essential conditions for the production of constructive interference fringes by the rays A and B is: (m = 1,2,3,...)
A force acts on a 3 g particle in such a way that the position of the particle as a function of time is given by x = 3t - 4t$^2$ + t$^3$, where x is in metres and t is in seconds. The work done during the first 4 second is
11. A real image of a distant object is formed by a planoconvex lens on its principal axis. Spherical aberration
The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river in shortest time 15 min. Then the velocity of river stream is
A voltmeter has a range 0-V with a series resistance R. With a series resistance 2 R, the range is 0-V'. The correct relation between V and V' is
The speed of radio-waves is equal to:
A car moving with a speed of 40 km/h can be stopped by applying brakes after at least 2 m. If the same car is moving with a speed of 80 km/h, what is the minimum stopping distance?