List of top Physics Questions

In Young's double slit experiment, the fringe width is 0.4 mm. What is the distance between \(4^{\text{th}}\) dark band and \(6^{\text{th}}\) bright band on the same side of the interference pattern?
The ratio of intensities at two points on the screen in Young's double slit experiment when waves from the two slits have a path difference of zero and \(λ/4\) is (\(λ\) is the wavelength of light used) (\(cos0^{\circ} = 1\), \(cosπ/2 = 0\))
In Young's double slit experiment, the distance between the slits is 3 mm and the slits are 2m away from the screen. Two interference patterns can be obtained on the screen due to light of wavelength 480 nm and 600 nm respectively. The separation on the screen between the \(5^{\text{th}}\) order bright fringes on two interference patterns is
A metal rod of length 'L' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field 'B'. Total resistance of the circuit is 'R'. The force needed to move the rod in the direction as shown with constant speed 'V' is
A simple microscope is used to see the object first in blue light and then in red light. Due to the change from blue to red light, what is the effect on its magnifying power?
An alternating e.m.f. is given by \(e = e_0sinωt\). In what time the e.m.f. will have half its maximum value, if 'e' Starts from zero?
A step down transformer has turns ratio 20:1. If 8V are applied across \(0.4 \Omega\) secondary then the primary current will be
When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit
With gradual increase in frequency of an a.c. supply, the impedance of an LCR series circuit
A metre bridge experiment, the resistance in the left gap is \(20 \Omega\) and in the right gap is \(60 \Omega\). The bridge is balanced. The distance of the null point from the centre of the wire is
Torque acting on a coil carrying current 'I' situated parallel to magnetic field of induction 'B' having of turns 'n' and area 'A' is
The magnetic moment produced in a sample of 2 gram is \(8\times 10^{-7}\,\text{A/m}^2\). If its density is \(4 \text{g/cm}^3\) then the magnetization of the sample is
A charged particle is moving in a uniform magnetic field in a circular path of radius 'R'. When the energy of the particle becomes 3 times the original, the new radius will be
A wire carrying current 'I' along x axis has length 'L' and it is kept in a magnetic field \(B(\hat{i}+2\hat{j}-2\hat{k})\) T. The magnitude of magnetic force acting on the wire is
A potentiometer wire is 4m long and potential difference of 3V is maintained between the ends. The e.m.f. of the cell which balances against a length of 100 cm of the potentiometer wire is
The electric field in the region is \(\overset{⃗}{E} = a\hat{i}+b\hat{j}\) where 'a' and 'b' are constants. The net electric flux passing through a square area of side 'l' parallel to Y-Z plane is
Two point charges \(q_1 = 6 μ\text{C}\) and \(q_2 = 4 μ\text{C}\) are kept at points A and B in air where distance \(AB = 10\) cm. What is the increase in potential energy of the system when \(q_2\) is moved towards \(q_1\), by 2 cm ? \((\frac{1}{4πε_0} = 9\times 10^9 \text{SI units})\)
The electric field between the plates of a parallel plate capacitor is 'E'. If the charge on the plates is Q then the force on each plate is
When the observer moves towards a stationary source with velocity '\(V_1\)', the apparent frequency of the emitted note is '\(F_1\)'. When the observer moves away from the source with velocity '\(V_1\)', the apparent frequency is '\(F_2\)'. If 'V' is the speed of sound in air and \(F_1/F_2 = 2\), then \(V/V_1 =\)
The equation of wave motion is \(Y = 6sin(12πt-0.02πx+\frac{π}{3})\) where x is in metre and time in second. The velocity of the wave is
Two condensers of capacities, '2C' and 'C' are joined in parallel and charged upto potential 'V'. The battery is then disconnected and condenser of capacity 'C' is filled completely with a medium of dielectric constant 'K'. The potential difference across the capacitors in the second case is
A monoatomic gas at pressure P having volume V expands isothermally to a volume 3V and then adiabatically to a volume 81 V. The final pressure of the gas is (\(γ = 5/3\)).
When a sonometer wire vibrates in the third overtone, the number of antinodes and nodes formed on the wire are respectively
The translational kinetic energy of the molecules of a gas at absolute temperature (T) can be doubled by
A progressive wave of frequency 50 Hz is travelling with velocity 350 m/s through a medium. The change in phase at given time interval of 0.01s is