List of top Physics Questions

With the help of a neat diagram, explain the reflection of light on a plane reflecting surface.
A 0.1 H inductor, a 25 × 10\(^{-6}\) F capacitor, and a 15 Ω resistor are connected in series to a 120 V, 50 Hz AC source. Calculate the resonant frequency.
Plane wavefront of light of wavelength 6000 Å is incident on two slits on a screen perpendicular to the direction of light rays. If the total separation of 10 bright fringes on a screen 2 m away is 2 cm, find the distance between the slits.
Eight droplets of water each of radius 0.2 mm coalesce into a single drop. Find the decrease in the surface area.
The difference between the two molar specific heats of a gas is 9000 J/kg K. If the ratio of the two specific heats is 1.5, calculate the two molar specific heats.
What are mechanical equilibrium and thermal equilibrium?
Distinguish between potentiometer and voltmeter.
What are harmonics and overtones (Two points)?
An electron in an atom is revolving round the nucleus in a circular orbit of radius 5.3 × 10\(^{-11}\) m with a speed of 3 × 10\(^6\) m/s. Find the angular momentum of electron.
Define moment of inertia of a rotating rigid body. State its SI unit and dimensions.
Derive an expression for the radius of the \( n \)-th Bohr orbit of the electron in hydrogen atom.
What are polar dielectrics and non-polar dielectrics?
What is a thermodynamic process? Give any two types of it.
Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?
What is the mathematical formula for third postulate of Bohr's atomic model?
Calculate the moment of inertia of a uniform disc of mass 10 kg and radius 60 cm about an axis perpendicular to its length and passing through its centre.
Write the differential equation for angular S.H.M.
State the formula for critical velocity in terms of Reynold's number for a flow of a fluid.
Is it always necessary to use red light to get photoelectric emission?
Write the Boolean expression for Exclusive-OR (XOR) gate.
In Young's double slit experiment the two coherent sources have different amplitudes. If the ratio of maximum intensity to minimum intensity is 16 : 1, then the ratio of amplitudes of the two sources will be ______.
The equation of a simple harmonic progressive wave travelling on a string is \( y = 8 \sin (0.02 x - 4 t) \) cm. The speed of the wave is ______.
Define potential gradient of the potentiometer wire.
A liquid rises in glass capillary tube up to a height of 2.5 cm at room temperature. If another glass capillary tube having radius half that of the earlier tube is immersed in the same liquid, the rise of liquid in it will be ______.
When the bob performs a vertical circular motion and the string rotates in a vertical plane, the difference in the tension in the string at horizontal position and uppermost position is ______.