List of top Physics Questions

Which statement is correct for the given circuit?
For what value of \( A \), \( B \), and \( C \), the output \( Y = 1 \)?
A metallic bar is heated from \(0^\circ \, \text{C}\) to \(100^\circ \, \text{C}\). The coefficient of linear expansion is \(10^{-5} \, \text{K}^{-1}\). What will be the percentage increase in length?
Two solenoids are given – 1st has 1 turn per unit length and 2nd has \(n\) turns per unit length. Ratio of magnetic fields at their centres is
A positively charged particle is placed near an infinitely long straight conductor where there is zero gravity. Then
If the wavelength is brought down from 6000 Å to 4000 Å in a photoelectric experiment then what will happen?
In given circuit, all resistances are of \( 1 \, \Omega \). Current flowing through ammeter is
If the terminal speed of a sphere of gold (density \(19.5 \, \text{g/cm}^3\)) is \(0.2 \, \text{m/s}\) in a viscous liquid (density \(1.5 \, \text{kg/m}^3\)), find the terminal speed of a sphere of silver (density \(10.5 \, \text{g/cm}^3\)) of the same size in the same liquid.
In shown fig, the circular loop of wire is moved with velocity towards the infinite current carrying wire. Then
For a current carrying inductor, emf associated is 20mV. Now, current through it changes from 6A to 2A in 2s. The coefficient of mutual inductance is
Holography is based on phenomenon of
The wavelength of an electron for transition from a state \(n_1\) to \(n_2\) is \( \frac{9}{8R} \). Which of the following wavelengths is possible for a transition from \(n_2\) to \(n_1\)?
A square current carrying loop is changed to a circular loop in time \( t_1 \). Then
In Wheatstone bridge, 4 resistors \( P = 10 \, \Omega \), \( Q = 5 \, \Omega \), \( R = 4 \, \Omega \), \( S = 4 \, \Omega \) are connected in cyclic order. To ensure no current through galvanometer,
In photoelectric effect, initially when energy of electrons emitted is \( E_0 \), de-Broglie wavelength associated with them is \( \lambda_0 \). Now, energy is doubled then associated de-Broglie wavelength \( \lambda' \) is
In given circuit, \( C_1 = C_2 = C_3 = C \) initially. Now, a dielectric slab of dielectric constant \( K = \frac{3}{2} \) is inserted in \( C_2 \). The equivalent capacitance becomes
The potential energy of a system increases if work is done
Average energy in one time period of a simple harmonic oscillator whose amplitude is A, angular velocity $\omega$ and mass m, is:
A pendulum with a period of 2 seconds at sea level has its length doubled. Its new period is now most nearly:
A proton and an electron are placed in a uniform electric field. Which of the following is correct?
A long string with a charge of a per unit length passes through an imaginary cube of edge L.
The maximum possible flux of electric field through the cube will be
A string of length $\ell$ is fixed at both ends. It is vibrating in its $3^{rd}$ overtone with maximum amplitude '$a$'. The amplitude at a distance $\ell /3$ from one end is.
The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \(R_1\) will be
two ideal diodes
A resistor of resistance $R$, capacitor of capacitance $C$ and inductor of inductance $L$ are connected in parallel to $A C$ power source of voltage $\epsilon_{0} \sin \omega_{t}$. The maximum current through the resistance is half of the maximum current through the power source. Then value of $R$ is
Two identical charged spheres suspended from a common point by two massless strings of lengths $l$, are initially at a distance $d(d < < l)$ apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity $v$. Then $v$ varies as a function of the distance $x$ between the spheres, as: