List of top Physics Questions

A condenser of capacity ‘C’ is charged to a potential difference of ‘V1’. The plates of the condenser are then connected to an ideal inductor of inductance ‘L’. The current through an inductor when the potential difference across the condenser reduces to ‘V2’ is

The relative angular speed of hour hand and second hand of a clock is (in rad/s)

The coefficient of linear expansion of brass and steel rod are ‘α1’ and ‘α2’ respectively. Lengths of brass and steel rods are ‘l1’ and‘l2’ respectively. If (l2 - l1) is maintained same at all temperatures, which one of the following relation is correct?

Given below are the velocity-time graph of five particles, A, B, C, D and E. The correct graph from the following v-t plot in which the velocity if the particle is a function of t2 is
A tuning fork produces 4 beats per second with both 26.0 cm and 25.2 cm of stretched sonometer wire. Frequency of the fork is
A charge of 4 μC is to be divided into two. The distance between the two divided charges is constant. The magnitude of the divided charges so that the force between them is maximum, will be:

Which of the following radiations of electromagnetic waves has the highest wavelength ?

In a series LCR Circuit R = 300 Ω, L = 0.9 H, c = 2.0 µF and w = 1000 rad/sec. Then the impedance of the circuit is 

A series resonant ac circuit contains a capacitance \(10^4\) F and an inductor of \(10^-4\) H. The frequency of electrical oscillations will be

A ray of light passes through an equilateral glass prism in such a manner that an angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of prism. The angle of deviation is

A magnetic field of flux density 1.0 Wb m-2 acts normal to a 80 turns coil of 0.01 m2 area. If this coil is removed from the field in 0.2 second, the emf induced in it is
A fully charged capacitor 'C' with initial charge 'q0' is connected to a coil of self inductance 'L' at t = 0. The time at which the energy is stored equally between the electric field and the magnetic field is
Which of the following statement proves that Earth has a magnetic field?

A long solenoid has 500 turns, when a current of 2A is passed through it, the resulting flux linked with each turns of solenoid is 4 x 10-3 Wb, then the self induction of solenoid is

An alternating current is given by i = i1 sin ωt + i2 cos ωt. The r.m.s. current is given by 

A wire of a certain material is stretched slowly by 10%. Its new resistance and specific resistance becomes respectively
If a voltage across a bulb rated 220 V, 100 W drops by 2.5 % of rated value. the percentage of rated value by which the power would decrease is

A circular coil of wire of radius 'r' has 'n' turns and carries a current ' I '. The magnetic induction 'B' at a point on the axis of the coil of distance √3 r from its center is

A galvanometer of resistance 50 Ω is connected to the battery of 3 V along with a resistance 2950 Ω in series. A full scale deflections of 30 divisions is obtained in galvanometer. In order to reduce this deflections to 20 division, the resistance in series should be
Wire bound resistors are made by
A charged particle is moving in an electric field of \(3 \times 10^{-10} \, \text{V} \, \text{m}^{-1}\) with mobility \(2.5 \times 10^{-6} \, \text{m}^2/\text{V}/\text{s}\) . Its drift velocity is
A parallel plate capacitor is charged by connecting a 2 Volt battery across it. It is then disconnected from the battery and a glass slab is introduced between plates. Which of the following pair of quantities decrease ?

Two tiny sphere carrying a charges 1.8 µC and 2.8 µC are located at 40 cm apart. The potential at the mid-point of the line joining the two charges is 

When a metal conductor is connected to left gap of meter bridge is heated, the balancing point

In an atom electrons revolve around the nucleus along a path of radius 0.72 A making 9.4 x 1014 revolutions per second. The equivalent current is. (Given e = 1.6 x 10-19 C)