List of top Physics Questions

The alternating current $ I $ in an inductor is observed to vary with time $ t $ as shown in the graph for a cycle.

Which one of the following graphs is the correct representation of wave form of voltage $ V $ with time $ t $?}

Which of the following circuits has the same output as that of the given circuit?

The distance of an object from the first focal point of a biconvex lens is $ X_1 $ and distance of the image from second focal point is $ X_2 $. The focal length of the lens is:

Define self inductance.

Using Newton's law of viscosity for streamline flow, derive an expression for coefficient of viscosity.

If a charge of 3 nC is placed at each vertex of a cube of side 3 m, then the electric potential at the centre of the cube is:

If the speed of light in glass is $ 2 \times 10^8 \, m/s $ and the speed of light in air is $ 3 \times 10^8 \, m/s $, the refractive index of glass with respect to air is:

In a region of a uniform electric field $ \mathbf{E} $, a negatively charged particle is moving with a constant velocity $ \mathbf{v} = -v_0 \hat{i} $ near a long straight conductor coinciding with XX' axis and carrying current $ I $ towards -X axis. The particle remains at a distance $ d $ from the conductor.

In resonance condition, the frequency of L-C circuit is

Using the mirror equation and the formula of magnification, deduce that “the virtual image produced by a convex mirror is always diminished in size and is located between the pole and the focus.”

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Electromagnetic waves carry energy but not momentum.
Reason (R): Mass of a photon is zero.
In the light of the above statements, choose the most appropriate answer from the options given below:

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:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Time period of a simple pendulum is longer at the top of a mountain than that at the base of the mountain.
Reason (R): Time period of a simple pendulum decreases with increasing value of acceleration due to gravity and vice-versa. In the light of the above statements, 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:

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?

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 $) \text{Choose the most appropriate answer from the options given below:}

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?

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 5-ohm resistor is connected to a 10 V battery. Calculate the current flowing through the resistor.

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:

The electric field at a point in space is $ 2 \times 10^3 \, \text{N/C} $ and the potential at the same point is $ 100 \, \text{V} $. What is the potential energy of a charge of $ 5 \, \mu\text{C} $ placed at that point?

The charge on a parallel plate capacitor is 200 μC and its capacitance is 4 μF. If the distance between the plates of the capacitor is 2 mm, then the electric force between the plates of the capacitor is

Two point charges $ +4 \, \mu\text{C} $ and $ -2 \, \mu\text{C} $ are separated by a distance of 0.3 m in air. What is the magnitude of the electrostatic force between them?

A current of 2 A flows through a conductor with a resistance of 5 $\Omega$. Calculate the potential difference across the conductor.