List of top Physics Questions

If T be the time period of a planet around the Sun and d is its mean distance from the Sun, then according to Kepler's third law
When no external torque acts on a rotating system,
The X and Y coordinates of the three particles of masses m, 2m and 3m are respectively (0,0), (1,0) and (-2,0). The X-coordinate of the centre of mass of the system is
A solid metal ring and a disc of same radius and mass are rotating about their diameters with same angular frequency. The ratio of their respective rotational kinetic energy values is
An object released from certain height h, from the ground rebounds to a height h/4after striking the ground. The fraction of the energy lost by it is
A ball with $10^3J$ of kinetic.energy coflides with a.hodzontally mounted spring. If the maximum compression of the. spring is 50 cm, then the spring constatrt of the spring is
The instantaneous power in terms of force F and instantaneous velocity v is
When a metal spring is elongated within its elastic limit
Area under the force-time graph gives the change in
On a conveyor belt moving with a speed u, sand falls at a constant rate $\frac{dm}{dt}$ where m is the mass of sand. The extra force required to maintain the speed of
Which one of the following statement is INCORRECT?
When a body starts from rest and moves with a constant acceleration, the velocity- time graph for its motion is
The stopping distance of a moving vehicle is proportional to the
A hammer is dropped into a mine. Its velocities at depths d, 2d and 3d are in the ratio
The velocity of a moving particle at any instant is $\hat{i} + \hat{j}$. The magnitude and direction of the velocity of the particle are 
If the percentage errors in the measurements of mass, length and time are 1%, 2% and 3% respectively, then the maximum permissible error in the measurement of the acceleration of a particle is
A physical quantity A on multiplication with velocity results in another quantity B. If the quantity B is energy, then the quantity A is
Pick out the INCORRECT statement from the following
In a transmitter the audio signal of frequency $ω_m$ is modulated by the carrier signal $ω_c$ and the band pass filter in it rejects the frequencies
The compound semiconductor used for making LEDs of different colours is
In a CB mode of a transistor the current through the emitter is 6 mA. If the current gain of the transistor is 0.95 then its base current is
transistor
Eddy currents are not used in the applicalion of
If you are running towards a plane mirror at a speed of 10cm/s, at what speed does your reflection approach you ?
How many times do the both the hands of a clock coincide in a day, considering a day is 24 hours ?
Rays from sun converge at a point 15 cm in front of concave mirror. Where should the object be placed so that size of its image is equal to the size of the object ?