List of top Physics Questions

If the rate at which the radiation is conuited by a black body at 0oC is 2 watt, the rate of emission at 273oC will be

If the door of a refrigerator in a room is kept open, the temperature of room will be

Huygen's principle of secondary waves is used to

The resolution limit of eye is 60 s. At a distance of X km from the eye two persons stand with lateral separation of 3 m. For the two persons to be just resolved by eye, X should be

A stone is dropped into a lake by a person from a 500m high tower. He would hear the sound after approximately

If the values of \(R=\frac{2}{5}\) Cv for a gas, then the atomicity of the gas will be

A domestic refrigerator is loaded with food and the door closed. During a certain period the machine consumes 1 KWh of energy and the internal energy of the system drops by 5000KJ. Find the net heat transfer for the system.

The friction of air causes a vertical resistance of 10% in acceleration due to gravity. The maximum height will be decreased by

A projectile can have the same range R for two angles of projection. If t₁ and t₂ can be the times of flight in the two cases then what is the product of the two times of flight?

A body is moving with a constant speed 'V' in a circle of radius r. Its angular acceleration is

A tuning fork arrangement produces 4 beats/second with one fork of frequency 288 Hz. A little wax is applied on the unknown fork and it then produces 2 beats/s.The frequency of the unknown fork is......Hz.

A steel ring of radius r and cross sectional area 'A' is fitted on to a wooden disc of radius R (R > r). If the Young's modulus be Y, then what is the force with which steel ring is expanded?

Which of the following is both unitless and dimensionless?

How many astronomical units are there in 1 metre

A lift is moving up with an acceleration equal to \(\frac{1}{5}\) of that due to gravity. The apparent weight of a 60 kg man standing in lift is:

Name the process in which Boyle's law is applicable?

To mop-clean a floor, a cleaning machine presses a circular mop of radius $R$ vertically down with a total force $F$ and rotates it with a constant angular speed about its axis. If the force $F$ is distributed uniformly over the mop and if coefficient of friction between the mop and the floor is $\mu$, the torque, applied by the machine on the mop is :

Due to Doppler?? effect the shift in wavelength observed is 0.1 ? for a star producing wavelength 6000 ?. Velocity of recession of the star will be

A light ray of wavelength 600 nm in incident on young's double slit experiment. Distance between silts is 2 mm and \( 5^{th}\) fringe is at a distance of 3 mm from central maxims, find the distance between slits and screen:

Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rod-mass system(see figure). Because of torsional constant $k$, the restoring torque is $\tau =k\theta$ for angular displacement $\theta$. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:

A carnot engine takes 300 calories of heat at 500 K and rejects 150 calories of heat to the sink. The temperature of the sink is

Induction furnace uses ______ to produce heat

Two objects of mass m each moving with speed u m/s collide at 90°, then final momentum is (assume collision is inelastic)

Maximum kinetic energy gained by the charged particle in the cyclotron is independent of