List of top Physics Questions

When a metallic surface is illuminated with a radiation of wavelength '\(λ\)', the stopping potential is 'V'. If the same surface is illuminated with radiation of wavelength \(6λ\), the stopping potential is \((\frac{V}{12})\). The threshold wavelength for the surface is
In photoelectric effect experiment, if the frequency of incident radiation (\(v\)) is increased, keeping all other factors constant, the stopping potential, ( \(v > v_0\)) (\(v_0\) = threshold frequency)
The angle of minimum deviation produced by a thin prism in air is \(δ_1\). What will be the minimum deviation (\(δ_2\)) if the prism is immersed in liquid ?
\([^an_g = \frac{3}{2}, ^an_{\ell} = \frac{1}{3}]\)
A double slit experiment is immersed in water of refractive index \(1.33\). The slit separation is 1 mm, distance between slit and screen is \(1.33\) m. The slits are illuminated by light of wavelength 6300 \(\text{Å}\). The fringe width is
In the phenomenon of refraction of light for the same angle of incidence
In an LCR series circuit, at resonance,
A series resonant circuit consists of an inductor 'L' and capacitor 'C' which produces resonant frequency 'f'. If 'L' is increased by '2L' and 'C' is changed to '9C' the resonant frequency will be
A long wire is bent into a circular coil of one turn and then into a circular coil of smaller radius having n turns. If the same current is passed in both the cases, the ratio of magnetic field produced at the centre for one turn to that of n turns is
An electric lamp connected in series with a capacitor and an a.c source is glowing with certain brightness. On reducing the frequency of source the brightness of the lamp
Two concentric circular coils having radii \(r_1\) and \(r_2\) (\(r_2<<r_1\)) are placed co-axially with centres coinciding. The mutual inductance of the arrangement is (Both coils have single turn, \(μ_0\) = permeability of free space)
Two solenoids A and B of equal number of turns have their lengths and radii in the same ratio \(1:3\). The ratio of the self-inductance of solenoid A to that of B will be
A thin ring of radius 'R' metre has charge 'q' coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of 'f' revolution/s. The value of magnetic induction at the centre of the ring in \(\text{Wb/m}^2\) is

( \(μ_0\) = permeability of free space )
Two parallel plate air capacitors are connected in parallel. Each capacitor has plate area \(A/2\) and separation between the plates is \(d\) and \(2d\) respectively. The equivalent capacity of the combination is

( \(ε_0\) = absolute permittivity of free space)
A charge moves in a circular path perpendicular to a magnetic field. The time period of revolution is independent of
A potentiometer wire is 4m long and potential difference of 2V is maintained between the ends. The e.m.f. of the cell which balances against a length of 80 cm of the potentiometer wire is
In metre bridge experiment, the resistance in the left gap is 15 \(\Omega\) and in the right gap is 45 \(\Omega\). The bridge is balanced. The distance of the null point from the centre of the wire is
An iron rod is placed parallel to magnetic field intensity 1000 A/m. The magnetic flux through the rod is \(3\times 10^{-4}\) Wb and its cross-sectional area is \(1.5 \text{cm}^2\). The magnetic permeability of rod in \(\text{Wb/}_{\text{A-m}}\) is
For a uniformly charged plane sheet, the variation of electric field (E) with distance (d) is correctly shown graphically in graph
When open pipe is closed from one end then second overtone of closed pipe is higher in frequency by 100 Hz than first overtone of open pipe. The fundamental frequency of open end pipe will be (Neglect end correction)
Capacitors of capacities \(C_1\) and \(C_2\) are connected in series. If the combination is connected to a supply of V volt then the potential difference across capacitor \(C_2\) is
A point charge 'Q' is placed at the centre of the line joining two equal charges '+q' and '+q'. The value of 'Q' when the system is in equilibrium is
A simple harmonic progressive wave is represented by \(y = Asin(120πt+3x)\). The distance between two points on the wave at a phase difference of \(\frac{π}{3}\) radian is
A pipe open at both ends has a fundamental frequency 'f' in air. The pipe is dipped in water, so that \(\frac{2}{3}^{rd}\) length of pipe is in water, Now the fundamental frequency of the air column is
A pendulum clock is running slow, In order to correct it, we should
The minimum phase difference between two simple harmonic motions is
\(x_1 = \frac{1}{\sqrt{2}}sinωt+\frac{1}{\sqrt{2}}cosωt\)
\(x_2 = sinωt+cosωt\)     \([sin\frac{π}{4} = cos\frac{π}{4} = \frac{1}{\sqrt{2}}]\)