List of top Physics Questions

In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes of $ P_1 $ and $ P_2 $ are orthogonal to each other. The polarizer $ P_3 $ covers both the slits with its transmission axis at $ 45^\circ $ to those of $ P_1 $ and $ P_2 $. An unpolarized light of wavelength $ \lambda $ and intensity $ I_0 $ is incident on $ P_1 $ and $ P_2 $. The intensity at a point after $ P_3 $, where the path difference between the light waves from $ S_1 $ and $ S_2 $ is $ \frac{\lambda}{3} $, is:

Three infinitely long wires with linear charge density $ \lambda $ are placed along the x-axis, y-axis and z-axis respectively. Which of the following denotes an equipotential surface?

The output of the circuit is low (zero) for:

(A) $ X = 0, Y = 0 $
(B) $ X = 0, Y = 1 $
(C) $ X = 1, Y = 0 $
(D) $ X = 1, Y = 1 $
Choose the correct answer from the options given below:

Arrange the following in the ascending order of wavelength ($ \lambda $):
(A) Microwaves ($ \lambda_1 $)
(B) Ultraviolet rays ($ \lambda_2 $)
(C) Infrared rays ($ \lambda_3 $)
(D) X-rays ($ \lambda_4 $)
Choose the most appropriate answer from the options given below:

A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into a square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is:

Two capacitors $ C_1 $ and $ C_2 $ are connected in parallel to a battery. Charge-time graph is shown below for the two capacitors. The energy stored with them are $ U_1 $ and $ U_2 $, respectively. Which of the given statements is true?

In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes of $ P_1 $ and $ P_2 $ are orthogonal to each other. The polarizer $ P_3 $ covers both the slits with its transmission axis at $ 45^\circ $ to those of $ P_1 $ and $ P_2 $. An unpolarized light of wavelength $ \lambda $ and intensity $ I_0 $ is incident on $ P_1 $ and $ P_2 $. The intensity at a point after $ P_3 $, where the path difference between the light waves from $ S_1 $ and $ S_2 $ is $ \frac{\lambda}{3} $, is:

A parallel plate capacitor with plate area $ A $ and plate separation $ d $ has a capacitance $ C_0 $. A slab of dielectric constant $ K $ having area $ A $ and thickness $ \left(\frac{d}{4}\right) $ is inserted in the capacitor, parallel to the plates. Find the new value of its capacitance.

Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity 2K while that in the middle has thermal conductivity K. The left end of the combination is maintained at temperature 3T and the right end at T. The rods are thermally insulated from outside. In steady state, temperature at the left junction is $T_1$ and that at the right junction is $T_2$. The ratio $T_1 / T_2$ is

A force of 49 N acts tangentially at the highest point of a sphere (solid of mass 20 kg) kept on a rough horizontal plane. If the sphere rolls without slipping, then the acceleration of the center of the sphere is:

A convex lens of focal length $ f = 15\,cm $ forms a real image of a 6 cm tall object placed at 30 cm. Find the position, nature, and height of the image.

Define a wavefront. An incident plane wave falls on a convex lens and gets refracted through it. Draw a diagram to show the incident and refracted wavefront.

Two projectile protons $ P_1 $ and $ P_2 $, both with spin up (along the $ +z $-direction), are scattered from another fixed target proton $ T $ with spin up at rest in the $ xy $-plane, as shown in the figure. They scatter one at a time. The nuclear interaction potential between both the projectiles and the target proton is $ \hat{\lambda} \vec{L} \cdot \vec{S} $, where $ \vec{L} $ is the orbital angular momentum of the system with respect to the target, $ \vec{S} $ is the spin angular momentum of the system, and $ \lambda $ is a negative constant in appropriate units. Which one of the following is correct?

What is the dimensional formula of $ \frac{1}{\mu_0 \epsilon_0} $ (where $ \mu_0 $ is permeability and $ \epsilon_0 $ is permittivity of free space)?

Given a charge $ q $, current $ I $ and permeability of vacuum $ \mu_0 $. Which of the following quantity has the dimension of momentum?

The dimensions of a physical quantity $ \epsilon_0 \frac{d\Phi_E}{dt} $ are similar to [Symbols have their usual meanings]

The dimensions of a physical quantity $ \epsilon_0 \frac{d\Phi_E}{dt} $ are similar to:

The expression given below shows the variation of velocity $ v $ with time $ t $: \[ v = \frac{At^2 + Bt}{C + t} \] The dimension of $ A $, $ B $, and $ C $ is:

Match List-I with List-II.

List-I
(A) Coefficient of viscosity
(B) Intensity of wave
(C) Pressure gradient
(D) Compressibility

List-II
(I) [ML^-1T^-1]
(II) [MT^-3]
(III) [ML^-2T^-2]
(IV) [M^-1LT²]

Match List-I with List-II.

Choose the correct answer from the options given below :

The equation for real gas is given by $ \left( P + \frac{a}{V^2} \right)(V - b) = RT $, where $ P $, $ V $, $ T $, and $ R $ are the pressure, volume, temperature and gas constant, respectively. The dimension of $ ab $ is equivalent to that of:

Which one of the following is the correct dimensional formula for the capacitance in F? M, L, T, and C stand for unit of mass, length, time, and charge.

Match List-I with List-II.

Choose the correct answer from the options given below:

A bar magnet has total length $ 2l = 20 $ units and the field point $ P $ is at a distance $ d = 10 $ units from the centre of the magnet. If the relative uncertainty of length measurement is 1\%, then the uncertainty of the magnetic field at point P is:

A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field $ B $ exists into the page. The bar starts to move from the vertex at time $ t = 0 $ with a constant velocity. If the induced EMF is $ E \propto t^n $, then the value of $ n $ is _____.