List of top Physics Questions

The capacitance of a parallel plate capacitor is 1.5 µF. If the distance between the plates is halved and the space between the plates is filled with a medium of dielectric constant 3, then the new capacitance is:

The internal and external diameters of a hollow cylinder measured with vernier calipers are (5.73 $\pm$ 0.01) cm and (6.01 $\pm$ 0.01) cm respectively. Then the thickness of the cylinder wall is

Steam of mass 60 g at a temperature $ 100^\circ C $ is mixed with water of mass 360 g at a temperature $ 40^\circ C $. The ratio of the masses of steam and water in equilibrium is?
(Latent heat of steam = 540 cal/g and specific heat capacity of water = 1 cal/g◦C)

Three logic gates are connected as shown in the figure. If the inputs are $ A = 0 $, $ B = 1 $, and $ C = 1 $, then the values of $ y_1 $, $ y_2 $, and $ y_3 $ are respectively:

A circular coil carrying a current of 2.5 A is free to rotate about an axis in its plane perpendicular to an external magnetic field. When the coil is made to oscillate, the time period of oscillation is $ T $. If the current through the coil is 10 A, the time period of oscillation is.

The density of a substance of mass 5.318 g which occupies a volume of 2.43 cm³ is (up to correct significant figures):

The energy gap between conduction and valence bands of silicon is:

Two equal resistances are connected in the two gaps of a meter bridge. If the resistance in the right gap is doubled, then the change in the balancing length is:

A block of mass $ m $ with an initial kinetic energy $ E $ moves up an inclined plane of inclination $ \theta $. If $ \mu $ is the coefficient of friction between the plane and the body, the work done against friction before coming to rest is:

The ratio of the lengths of two wires A and B made of same material is 2:1. The diameter of wire A is twice the diameter of wire B. If both the wires are stretched by same tension, the ratio of the energies stored in wires A and B is:

If the ratio of the radii of nuclei $ \mathbf{^{52}X_A} $ and $ \mathbf{^{13}Al^{27}} $ is 5:3, then the number of neutrons in the nucleus $ X $ is:
Choose the correct answer from the options given below:

A 10 ÂµF capacitor is charged by a 100 V battery. It is disconnected from the battery and is connected to another uncharged capacitor of capacitance 30 ÂµF. During this process, the electrostatic energy lost by the first capacitor is.

A body thrown vertically upwards from the ground reaches a maximum height ‘h’. The ratio of the kinetic and potential energies of the body at a height 40\% of h from the ground is

Two long straight parallel wires A and B separated by $ 5 $ m carry currents $ 2 $ A and $ 6 $ A respectively in the same direction. The resultant magnetic field due to the two wires at a point $ 2 $ m distance from the wire A in between the two wires is?

The ratio between electric field energy density and magnetic field energy density of an electromagnetic wave, in its region is:

A metal block of mass 120 g is heated to a temperature of 100$^\circ$C and placed on a huge block of ice at 0$^\circ$C. The specific heat capacity of the metal is 0.12 cal/$^\circ$C and the latent heat of fusion of ice is 80 cal/g. The mass of the ice melted is:

The maximum horizontal range of a ball projected from the ground is 32 m. If the ball is thrown with the same speed horizontally from the top of a tower of height 25 m, the maximum horizontal distance covered by the ball is: (Acceleration due to gravity $ g = 10 \, \text{m/s}^2 $) \vspace{0.5cm}

Two equal resistances are connected in the two gaps of a meter bridge. If the resistance in the right gap is doubled, then the change in the balancing length is:

Two particles of charges in the ratio $ 1:2 $ and masses in the ratio $ 2:3 $ moving along a straight line enter a uniform magnetic field at right angles to the direction of the field. If the radii of the circular paths of the particles in the magnetic field are in the ratio $ 3:4 $, then the ratio of the initial linear momenta of the two particles is:

The energy stored in a coil of inductance 80 mH carrying a current of 2.5 A is:

For the displacement current through the plates of a parallel plate capacitor of capacitance 30 µF to be 150 µA, the potential difference across the plates of the capacitor has to vary at the rate of:

The efficiency of a bulb of power $ 60 $ W is $ 16\% $. The peak value of the electric field produced by the electromagnetic radiation from the bulb at a distance of $ 2 $ m from the bulb is? \[ \left(\frac{1}{4\pi \epsilon_0} = 9 \times 10^9 \text{ Nm}^2\text{C}^{-2} \right) \]

For a combination of two convex lenses of focal lengths $ f_1 $ and $ f_2 $ to act as a glass slab, the distance of separation between them is:

A and B are two points of a string, in which a standing wave of wavelength $ \lambda $ is set up. If the distance between the points A and B is $ \frac{3\lambda}{4} $, then the phase difference between A and B is:

Two closed pipes when sounded simultaneously in their fundamental modes produce 6 beats per second. If the length of the shorter pipe is 150 cm, then the length of the longer pipe is: \[ \text{(Speed of sound in air = 336 ms}^{-1}) \]