List of top Physics Questions

State the advantages of a potentiometer over a voltmeter.
In a thermodynamic system, define -- (a) Mechanical equilibrium (b) Chemical equilibrium and (c) Thermal equilibrium
Obtain an expression for the period of a bar magnet vibrating in a uniform magnetic field, performing S.H.M.
In a series LCR circuit, if resistance, inductive reactance and capacitive reactance are 3\(\Omega\), 8\(\Omega\) and 4\(\Omega\) respectively, calculate phase difference between voltage and current.
A gas of 0.5 mole at 300 K expands isothermally from an initial volume of 2.0 litre to a final volume of 6.0 litre. What is the work done by gas?
Two coils having self inductances 60 mH each, are coupled with each other. If the coefficient of coupling is 0.75, calculate the mutual inductance between them.
Explain harmonics and overtones.
Calculate the energy radiated in one minute by a perfectly black body of surface area 200 cm\(^2\) when it is maintained at 127\(^{\circ}\)C.
Find kinetic energy of 1 litre of an ideal gas at S.T.P.
What is the work done by an external uniform magnetic field perpendicular to the velocity of a moving charge?
What do you mean by a thermodynamic system?
Which of the following equations gives correct expression for the internal resistance of a cell by using potentiometer?
The gate which produces high output, when its both inputs are high is --
An electron, a proton, an \(\alpha\)-particle and a hydrogen atom are moving with the same kinetic energy. The associated de-Broglie wavelength will be longest for --
A transformer increases an alternating e.m.f. from 220V to 880V. If primary coil has 1000 turns, the number of turns in the secondary coil are .............
The shortest distance between an object and its real image formed by a thin convex lens of focal length 20 cm is _____ cm. (in integer)
A body of mass 500 gram is rotating in a vertical circle of radius 1 m. What is the difference in its kinetic energies at the top and the bottom of the circle?
Three blocks A, B and C are arranged as shown in the figure such that the distance between two successive blocks is 10 m. Block A is displaced towards block B by 2 m and block C is displaced towards block B by 3 m. The distance through which the block B should be moved so that the centre of mass of the system does not change is
Three blocks A, B and C are arranged as shown in the figure
What is photoelectric effect? What are the laws of photoelectric effect? Explain this law given by Einstein.
Define wavefront and secondary wavelets. Verify the law of reflection on the basis of Huygens’ wave theory.
Define self-inductance and mutual inductance. Find an expression for mutual inductance of two coaxial solenoids.
Mention two different modes of propagation used in communication system.
State Kirchhoff's laws and use them to obtain the condition for balance of a Wheatstone bridge.
A proton and an electron have the same kinetic energy. Which one has greater de Broglie wavelength and why?
Explain Bohr's stable orbit.