List of top Physics Questions

In a certain 2-inputs logic gate, when $A=0, B=0$, output $C=1$. When $A=0, B=1$, output $C=1$. The gate must be

When observer moves toward stationary source with $v_1$, apparent frequency is $F_1$. When moving away with $v_1$, it is $F_2$. If $F_1/F_2 = 2$, find $V/v_1$.

A calorimeter contains 10 g of water at $20^{\circ}C$. The temperature falls to $15^{\circ}C$ in 10 min. When calorimeter contains 20 g of water at $20^{\circ}C$, it takes 15 min. for the temperature to become $15^{\circ}C$. The water equivalent of the calorimeter is}

In an AC circuit containing L, C, R in series, the ratio of true power to apparent power is

In YDSE, second minimum is observed exactly in front of one slit. The wavelength of light used is

An ideal gas taken through process ABCA. If net heat supplied is 5 J, find work done in process $C \to A$.

Two wires of equal lengths are bent in the form of a square and a circular loop. They are suspended in a uniform magnetic field and same current is passed through them. Torque experienced by

A simple pendulum is suspended from the ceiling of a lift. When the lift is at rest, its period is 'T'. With what acceleration 'a' should the lift be accelerated upward in order to reduce the period to $T/2$?

A solid sphere at rest rolls down an inclined plane of vertical height h without sliding. Its speed on reaching the bottom of plane is ($g=$ acceleration due to gravity)

Let $E_{e}$ and $E_{p}$ represent kinetic energy of electron and photon. If de-Broglie wavelength of photon is twice that of electron, find $E_p/E_e$ (speed of electron $= c/100$)}

Five capacitors, each of capacitance C, are connected as shown. The ratio of equivalent capacitance between P and R ($C_{PR}$) and the equivalent capacitance between P and Q ($C_{PQ}$) is

Refractive index of a glass convex lens is 1.5. The radius of curvature of each of the two surfaces of the lens is 40 cm. The ratio of the power of the lens when immersed in a liquid of refractive index 1.25 to that when placed in air is

The work done in splitting a water drop of radius R into 64 droplets is ($T=$ surface tension)

The frequency at resonance for the circuit is

Graph shows variation of fringe width (X) versus distance of the screen (D) in Young's experiment. The wavelength $\lambda$ is:

Lorentz magnetic force is acting on a particle of charge q moving with velocity $\vec{V}$ in a magnetic field $\vec{B}$. The work done by this force on the charged particle is}

If p-n junction diode is forward biased, then

A same torque is applied to a disc and a ring of equal mass and radii then

Two spherical black bodies have radii $R_{1}$ and $R_{2}$ and temperatures $T_{1}$ and $T_{2}$. If they radiate same power, then $R_2/R_1$ is}

The magnetic moment of electron due to orbital motion is proportional to ($n=$ principal quantum number)

A capacitor of unknown capacity is connected across a battery of V volt. The charge stored in it is Q coulomb. When potential across the capacitor is reduced by $V_{1}$ volt, the charge stored in it becomes $Q_{1}$ coulomb. The potential V is}

An electron in the ground state (with energy $E_1$) of a hydrogen atom, absorbs a photon of energy $E_a$, and gets excited to a higher energy level of principal quantum number $n$. What is the value of $n$?

A source produces a light beam of intensity $I_0$ polarized along the $x$-direction. The beam is sent along the $z$-direction. It enters a polaroid $P_1$ with its polaroid axis aligned along the $y$-direction so that no light exits the polaroid. When another polaroid $P_2$ is placed in between the source and $P_1$, the intensity measured after $P_1$ is $3I_0/16$. Which among the following is a possible value of $\theta$, the angle of the polaroid axis measured from the $x$-axis?

Consider an equilateral prism of refractive index 1.5 and a parallelepiped block of refractive index 2.0 arranged as shown in the figure such that their adjacent faces are parallel. A light ray enters the prism from air at an angle of incidence such that the ray travels through the prism parallel to its base. What is the angle of emergence $\theta$?