List of top Physics Questions

In Young's double slit experiment, the interference pattern is found to have an intensity ratio between bright and dark fringes is 9. This implies the
Four independent waves are represented by equations \[ X_1 = a_1 \sin \omega t, \, X_2 = a_2 \sin 2 \omega t, \, X_3 = a_3 \sin \omega t, \, X_4 = a_4 \sin (\omega t + \delta) \] Interference is possible between waves represented by equations
Following diffraction pattern was obtained using a diffraction grating using two different wavelengths \( \lambda_1 \) and \( \lambda_2 \). With the help of the figure identify which is the longer wavelength and their ratios.
The temperature coefficient of resistance of a wire is \( 0.00125 \, \text{K}^{-1} \). At 300K its resistance is 1 ohm. The resistance of the wire will be 2 ohms at
A rectangular coil ABCD which is rotated at a constant angular velocity about a horizontal axis as shown in the figure. The axis of rotation of the coil as well as the magnetic field \( B \) are horizontal. Maximum current will flow in the circuit when the plane of the coil is
There are two solenoids of same length and inductance \( L \) but their diameters differ to the extent that one can just fit into the other. They are connected in three different ways in series. 1) They are connected in series with separated by large distance 2) they connected in series with one inside the other and senses of the turns coinciding 3) they are connected in series with one inside the other with senses of the turns opposite as depicted in figures 1, 2 and 3 respectively. The total inductance of the solenoids in each of the case 1, 2 and 3 are respectively
If the total emf in a thermocouple is a parabolic function expressed as \( E = at + \frac{1}{2}bt^2 \), which of the following relations does not hold good
The proton of energy 1 MeV describes a circular path in plane at right angles to a uniform magnetic field of \( 6.28 \times 10^{-4} \, \text{T} \). The mass of the proton is \( 1.7 \times 10^{-27} \, \text{Kg} \). The cyclotron frequency of the proton is very nearly equal to
A wire AB, in the shape of two semicircular segments of radius \( R \) each and carrying a current \( I \), is placed in a uniform magnetic field \( B \) directed into the page (see figure). The magnitude of the force due to the field on the wire AB is
Twelve wires of each resistance 6 ohms are connected to form a cube as shown in the figure. The current enters at a corner A and leaves at the diagonally opposite corner G. The joint resistance across the corners A and G are
A uniform copper wire of length 1m and cross-sectional area \(5 \times 10^{-7} \, \text{m}^2\) carries a current of 1A. Assuming that there are \(8 \times 10^{28} \, \text{free electrons/m}^3\) in copper, how long will an electron take to drift from one end of the wire to the other?
Two point like charges Q1 and Q2 of whose strength are equal in absolute value are placed at a certain distance from each other. Assuming the field strength to be positive in the positive direction of x-axis the signs of the charges Q1 and Q2 for the graphs (field strength versus distance) shown in Figures 1, 2, 3, and 4 are
The electric field intensity \( E \), due to an electric dipole of moment \( p \), at a point on the equatorial line is
A conductor and a semi-conductor are connected in parallel as shown in the figure. At a certain voltage both ammeters register the same current. If the voltage of the DC source is increased then
A parallel plate capacitor of capacitance 100 pF is to be constructed by using paper sheets of 1 mm thickness as dielectric. If the dielectric constant of paper is 4, the number of circular metal foils of diameter 2 cm each required for the purpose is
ABCD is a rectangle. At corners B, C, and D of the rectangle are placed charges \( +10 \times 10^{-12}C \), \( -20 \times 10^{-12}C \), and \( +10 \times 10^{-12}C \) respectively. Calculate the potential at the fourth corner. The side AB = 4 cm and BC = 3 cm
The antenna current of an AM transmitter is 8A when only the carrier is sent, but it increases to 8.93A when the carrier is modulated by a single sine wave. Find the percentage modulation.
The transmission of high frequencies in a coaxial cable is determined by
Radar waves are sent towards a moving airplane and the reflected waves are received. When the airplane is moving towards the radar, the wavelength of the wave
In Boolean algebra, \( A \cdot B \) is equal to
Identify the logic gate from the following TRUTH table
The output stage of a television transmitter is most likely to be a
The temperature coefficient of a zener mechanism is
Two identical P-N junctions are connected in series in three different ways as shown below to a battery. The potential drop across the P-N junctions are equal in
The radius of nucleus is