List of top Physics Questions

The light beams of intensities in the ratio of 9 : 1 are allowed to interfere. What will be the ratio of the intensities of maxima and minima ?
The electric potential at a point on the axis of an electric dipole depends upon the distance r (> > a) of the point from centre of the dipole as
The potential energy of a particle varies with distance x from a fixed origin as ∨=(Axx+B), where A and B are constants. The dimensions of AB are
If the length of the second's hand in a stop-clock is 3 cm, then the angular velocity and linear velocity of the tip is
Experimental investigations show that the intensity of solar radiation is maximum for a wavelength 480 nm in the visible region.Estimate the surface temperature of sun. Given Wein’s constant b = 2.88 × 10–3 mK.
In the figure, the block B of mass m starts from rest at the top of a wedge W of mass M. All surfaces are without friction. W can slide on the ground. B slides down onto the ground, moves along it with a speed , has an elastic collision with the wall and climbs back onto W. Then,
A current of i amp flows in the loop having circular arc r metre, subtending an angle  as shown in the figure. The magnetic field at centre O of circle is
A particle moves in xy plane according to the law x = a sin ωt and y = a(1 - cos ωt), where a and w are constant. The particle traces
In the following common emitter circuit, if β = 100, VCE = 7V, VBE = Negligible and RC = 2 kΩ, then IB is equal to
A body of mass 40kg is resting on a rough horizontal surface and is subjected to a force P, which is just enough to start the motion of the body. If μs=5,μk=0.4,g=10m/s2 and the force P is continuously applied on the body, then the acceleration of the body is
In the figure, a horizontal force F is applied such that the block remains stationary. Which of the following statements is false?
The coercivity of a small magnet where the ferromagnet gets demagnetised is 3 x 103 Am–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetised when inside the solenoid, is
The equation of a wave is y=5sin⁡(t0.04−x4), where x is in cm and t in seconds. The maximum velocity of the particle will be
Three identical thin bar magnets, each of moment M, are placed along three adjacent sides of a regular hexagon as shown in the figure. The resultant magnetic moment of the system is
Three identical thin bar

A short bar magnet of magnetic moment m = 0.32 J T-1 is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its ( a ) stable, and ( b) unstable equilibrium? What is the potential energy of the magnet in each case?

The magnetic field energy in an inductor changes from maximum value to minimum value in 5 ms, when connected to an a.c. source. The frequency of the source is
A 12V battery, a 12 Ω resistor and a 4 Ω resistor are connected. The voltage across 12Ω resistor is that across
A cylindrical wire is stretched to increase its length by 10%. Percentage increase in its resistance is:
A nucleus with atomic number Z and mass number A undergoes alpha decay. Which of the following is true?
A car of mass M is moving with uniform velocity v on a horizontal road. When a person of mass m drops on it from above, the velocity of the car will be?
The rest mass of photon is____.
As mass A increases. Which of the following quantities related to a nucleus do not change?
When we push a wooden crate on the concrete floor, then which of the following statements is true?
Which of the following statements is true?
A ball falls from a height of 20 m on the floor and rebounds to a height of 5 m. Time of contact is 0.02 s. Find the acceleration during impact