List of top Physics Questions

What is equivalent lens? Derive an expression for equivalent focal length of two lenses of focal lengths \(f_1\) and \(f_2\) kept at a distance \(d\).
Define volume density of charge. Write its SI unit.
State and prove Gauss's theorem in electrostatics. Calculate the electric field intensity at a point outside a hollow uniformly charged sphere.
Mention two different modes of propagation used in communication system.
A proton and an electron have the same kinetic energy. Which one has greater de Broglie wavelength and why?
Explain Bohr's stable orbit.
State Kirchhoff's laws and use them to obtain the condition for balance of a Wheatstone bridge.
Write two properties of beta rays.
Explain magnetic moment. Write its SI unit.
Mention the two characteristic properties of the material suitable for making the core of a transformer.
Convert decimal numbers 21 and 43 into their equivalent binary numbers.
Write down the difference between nuclear fission and nuclear fusion.
Write Fleming's left hand rule.
Write the necessary conditions for total internal reflection of light.
Write two properties of paramagnetic substances.
Write down two basic differences between interference and diffraction.
Compare the magnetic properties of steel and soft iron.
The self-inductance of a solenoid depends on
How does refractive index of any medium depend upon the wavelength of light?
The applied voltage in an alternating circuit is 220 V. If \( R = 8 \, \Omega \) and \( X_L = X_C = 6 \, \Omega \), then find the root mean square value of voltage and impedance of the circuit.
Explain electrical resonance.
Which of the following devices is based on the principle of electromagnetic induction?
What do you mean by power of accommodation of eye?
If the length of a conductor is doubled while keeping the potential difference across it constant, then the drift velocity of electron will
The direction of magnetic field inside a current carrying solenoid is