List of top Physics Questions

Two lenses, one of focal length 20 cm and another of power 4D are placed together, what is the effective power of the combination?
Which force holds the nucleons together in the nucleus of the atom?
A constant force acts on a body at rest, resulting it to move with constant acceleration. If power relates to time as \( P \propto t^n \), what is the value of \( n \)?
If two planets A and B have their densities in the ratio 2:1 and radii in the ratio 1:2, what will be the ratio of escape velocities from their surfaces?
For an elastic collision
Current in a circuit is 0.6 A when an external resistance of \( 3 \, \Omega \) is connected. When the external resistance is changed to \( 6 \, \Omega \), current in the circuit becomes 0.4 A. Find the internal resistance of the cell.
Transformer core is laminated because:
Transformer core is laminated because:
If \( I = 16 \, \text{A} \), electron density \( n = 5 \times 10^{23} \, \text{m}^{-3} \), and \( A = 1 \times 10^{-7} \, \text{m}^2 \), find the drift velocity.
For an elastic collision
Which of the following statement is correct for EM wave:
What should be connected in the circuit to remove ripples in AC:
Bernoulli's principle is applicable for:
Given \( I = 2A \), \( \phi = 10^{-2} \, \text{weber} \), \( N = 1000 \), calculate the self-inductance.
At a certain height \( h \) from the surface of Earth, the value of acceleration due to gravity is \( \frac{g}{9} \), where \( g \) is the acceleration due to gravity at the surface. What is the value of \( h \) in terms of the radius of Earth \( R \)?
If a proton is displaced by 5m in an electric field of \(50 \, \text{N/C}\), what is the work done by the electric field?
A particle of charge equal to 10 times the charge of an electron revolves in a circle with frequency equal to 10 revolutions per second. Find the magnetic field at the centre of the circular path.
What should be connected in the circuit to remove ripples in AC:
Bernoulli's principle is applicable for:
If \( I = 2 \, \text{A}, \, \phi = 10^{-2} \, \text{Weber}, \, N = 1000 \), calculate the self-inductance.
What is the ratio of the longest wavelength in Lyman and Balmer series?
A Carnot engine is working between 400K and 500K. If the output work is 1 kJ, what is the heat absorbed?
What should be connected in the circuit to remove ripples in AC?
Find the relation between the wavelength of proton and electron, if both particles have the same kinetic energy.
A circular loop is made from a wire of length 6m. If 2A current passes through the circular loop, what is the magnetic moment of the loop?