List of top Physics Questions

When no external torque acts on a rotating system,
Radius of gyration of a solid cylinder of radius R and length L about its long axis of symmetry is
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?
A wooden block of mass 10 kg is moving with an acceleration of 3ms on a rough floor. If the coefficient of friction is 0.3, then the applied force on it is (g=10ms)
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
A current through a wire depends on time as $i =\alpha_{0} t +\beta t ^{2}$ where $\alpha_{0}=20 A / s$ and $\beta=8 As ^{-2} .$ Find the charge crossed through a section of the wire in $15 s$.
Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be: