List of top Physics Questions

Calculate the resultant resistance in the following circuit.
resultant resistance
The resistance of a 10 m long wire is 10 $ \Omega $. Its length is increased by 25\% by stretching the wire uniformly. The new resistance is
A voltmeter of resistance $1000 \, \Omega $ and $0.5 \, \text{V/div} $ is to be converted into a voltmeter to make it read $1 \, \text{V/div} $. The value of high resistance to be connected in series with it is
Energy a system possesses because of the force exerted on its mass by a gravitational or electromagnetic field with respect to a reference surface.
You lift a heavy book from the floor of the room and keep it in the bookshelf having a height of 2m. This process takes 5 seconds. The work done by you will depend on
If the unit of force and length are doubled, the unit of energy will be
A scooter moves with a speed of 7 m/s on a straight road and is stopped by applying the brakes. Before stopping, the scooter travels 10 m. If the weight of the scooter is W, then the total resistance to the motion of the scooter will be

Find out the angle of refraction in a medium of refractive index \(\sqrt{3}\), when the angle of incidence is \(60^\circ\). 
 

Represent the variation of binding energy per nucleon with mass number. On the basis of it, explain the following: (i) Nuclear fission
(ii) Nuclear fusion
(iii) Nuclear energy
Obtain the formula of the relationship of drift velocity and potential difference.
Given that the surface charge density on a sphere is 200 μC/m2, what is the electric field at the surface of the sphere?

In hydrogen atom, what is the ionization potential of the electron in the ground state? 
 

A box of mass 20 𝑘𝑔 is pulled at constant speed across a floor by a rope. The rope makes an angle of 45° with the horizontal. Assuming that friction is negligible, the work done in pulling the box by a distance of 20 𝑚 is _____ 𝐽 (rounded off to the nearest integer). (Use $𝑔 = 9.8 𝑚𝑠^{−2}$)

Young double slit arrangement is placed in a liquid medium of 1.2 refractive index. Distance between the slits and screen is 2.4 m. 
Slit separation is 1 mm. The wavelength of incident light is 5893 Å. The fringe width is:

What is the angular momentum of an electron in an atom if the principal quantum number $ n = 2 $?
Explain the change in internal energy of a thermodynamic system (the gas) by heating it.
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If drift velocity of electron be \( v_d \) and intensity of electric field \( E \), then which relation among the following obeys Ohm's law?
Why is detergent powder mixed with water to wash clothes?

Obtain the expression for capacity of a parallel plate capacitor. How will the capacity of the capacitor be increased? 
 

The mechanical advantage of a wheel and axle system is:
A 25 kW drilling machine is drilled for 4 minutes to bore a hole in an aluminium block of mass \(20 \times 10^3\) kg. If 40\% of the work done is utilized to raise the temperature of the block and if the specific heat of aluminium is \(0.9 \, {kJ/kg}^\circ C\), then the rise in temperature of aluminium block is:
Write the properties of diamagnetic, paramagnetic, and ferromagnetic materials.
What is the Rydberg constant? Write down its unit.
Define self-inductance and write its S.I. unit. Find the self-inductance for a solenoid of \( N \) turns, length \( l \), and radius \( r \).
What is interference of light? Find an expression for fringe width in Young's double slit experiment.