List of top Physics Questions

A ray of light travels from air to water to glass and again from glass to air. Refractive index of water with respect to air is 'x', glass with respect to water is 'y' and air with respect to glass is 'z'. Which one of the following is correct?
An equiconvex lens of focal length F is cut in to two equal parts along the vertical axis. The focal length of each part will be
A series LCR circuit is connected to an a.c. source of \(220\) V, \(50\) Hz. The circuit contains a resistance \(R = 80\,\Omega\), an inductor of inductive reactance \(70\,\Omega\) and capacitor of capacitive reactance \(130\,\Omega\). The power factor of the circuit is \(\frac{x}{10}\). The value of x is
Determine the frequency for which a \(10\,μ\text{F}\) capacitor has a reactance of \(2\times 10^{-3}\,\Omega\).
The coefficient of mutual induction is \(3\)H and induced e.m.f. across secondary is \(4\) kV. Current in primary is reduced from \(7\)A to \(2\)A. The time required for the change of current is
Lorentz magnetic force is acting on a particle of charge \(q\) moving with velocity \(\overset{⃗}{V}\) in magnetic field \(\overset{⃗}{B}\). The work done by this force on the charged particle is
A coil of 'n' turns and resistance \(R\,\Omega\) is connected in series with a resistance \(R/4\). The combination is moved for time 't' second through flux \(\Phi _1\) to \(\Phi _2\). The induced current in the circuit is
A circular coil of 'N' turns and diameter 'd' carries current 'I'. It is unwound and rewound to make another coil of diameter '2d', current 'I' remaining the Same. The ratio of magnetic moments of the new coil to the original coil is
A bar magnet falls from a height 'h' through a metal pipe, its acceleration after coming out of pipe is
The product of magnetic susceptibility (\(χ\)) and absolute temperature (T) is constant for a
The function of a dielectric in a capacitor is to
When a resistance of \(200\,\Omega\) is connected in series with a galvanometer of resistance G, its range is V. To triple its range, a resistance of \(2000\,\Omega\) is connected in series. The value of G is
If a galvanometer is shunted by \((\frac{1}{n-1})^{th}\) of the value of its resistance, then the fraction of the total current passing through the galvanometer is
The potential difference that must be applied across the parallel and series combination of three identical capacitors such that the energy stored in them becomes the same. The ratio of potential difference in parallel to series combination is
A Pipe open at one end has length \(0.8\) m. At the open end of the tube a string \(0.5\) m long is vibrating in its first overtone and resonates with fundamental frequency of pipe. If tension in the string is \(50\) N, the mass of string is (Neglect end correction) (Speed of sound \(= 320\) m/s)
The number of lines of force originating from a point charge of \(2\times 8.85\times 10^{-9}\) C in a medium of dielectric constant \(10\) is (\(ε_0 = 8.85\times 10^{-12}\) SI unit)
A wire is under tension of \(2\) kg wt and a wave is travelling through it with some speed. Tension in the wire is so increased that the wave travels through it with thrice the original speed. The increase in tension is (in kg wt)
A small sphere oscillates simple harmonically in a watch glass whose radius of curvature is \(1.6\) m. The period of Oscillation of the sphere is (Acceleration due to gravity \(g = 10\text{ m/s}^2\))
The fundamental frequency of sonometer wire is \(50\) Hz for some length and tension. If the length is increased by \(25\%\) by keeping the tension same, then the frequency change of second harmonic is
A sonometer wire resonates with \(4\) antinodes between the two bridges for a given tuning fork when \(1\) kg mass is suspended from the wire. Using same fork, when mass M is suspended, the wire resonates producing \(2\) antinodes between the two bridges. (Distance between the bridges as before) The value of M is
A monoatomic gas is stored in a thermally insulated container and the gas is suddenly compressed to \((\frac{1}{8})^{th}\) of its initial volume. The ratio of final pressure to initial pressure is
In thermodynamic isobaric process
The average force applied on the walls of a closed container depends on temperature (T) as (T is the temperature of an ideal gas)
A particle executes linear S.H.M. with amplitude \(4\) cm. The magnitude of velocity and acceleration is equal when it is at \(3\) cm from mean position. Time period is
A particle starts from mean position and performs S.H.M. with period \(6\) second. At what time its kinetic energy is \(50\%\) of total energy? (\(cos45^{\circ} = 1/\sqrt{2}\))