List of top Physics Questions

A 2 – gram object, located in a region of uniform electric field \(\vec{E}=(300\ N\ C^{-1})\hat{i}\) carries a charge Q. The object released from rest at x = 0 , has a kinetic energy of 0.12 J at x = 0.5 m. Then Q is
Electric field due to infinite, straight uniformly charged wire varies with distance ‘r’ as
A copper rod AB of length l is rotated about end A with a constant angular velocity ω. The electric field at a distance x from the axis of rotation is
To propagate both longitudinal and transverse waves, a material must have
A number of Carnot engines are operated at identical cold reservoir temperatures (TL). However, their hot reservoir temperatures are kept different. A graph of the efficiency of the engines versus hot reservoir temperature (TH) is plotted. The correct graphical representation is
A gas mixture contains monoatomic and diatomic molecules of 2 moles each. The mixture has a total internal energy of (symbols have usual meanings)
Two capillary tubes P and Q are dipped vertically in water. The height of water level in capillary tube P is \(\frac{2}{3}^{rd}\) of the height in capillary tube Q. The ratio of their diameter is _______.
Which of the following curves represent the variation of coefficient of volume expansion of an ideal gas at constant pressure?
A ball hits the floor and rebounds after an inelastic collision. In this case
In figure E and Vcm represent the total energy and speed of centre of mass of an object of mass 1kg in pure rolling. The object is :
total energy and speed of centre of mass of an object
A 1 kg ball moving at 12 ms-1 collides with a 2 kg ball moving in opposite direction at 24 ms-1. If the coefficient of restitution is \(\frac{2}{3}\), then the velocities after the collision are
A coin placed on a rotating turn table just slips if it is placed at a distance of 4 cm from the centre. If the angular velocity of the turn table is doubled it will just slip at a distance of :
A particle starts from the origin at t = 0s with a velocity of \(10\hat{j}\) ms-1 and move in the x-y plane with a constant acceleration of \((8\hat{i}+2\hat{j})\) ms-2 . At an instant when the x-coordinate of the particle is 16 m, y-coordinate of the particle is:
A particle starts from rest. Its acceleration ‘a’ versus time ‘t’ is shown in the figure. The maximum speed of the particle will be:
Graph of speed of paricle
For a body moving along a straight line, the following v-t graph is obtained.
Graph of body moving along a straight line
According to the graph, the displacement during
In an electromagnetic wave, the oscillating electric and magnetic field vectors are oriented in
Electromagnetic waves against their detection devices are matched below. The mismatch is
The total intensity of earth's magnetic field at the poles is 7 units. Its value at the equator is
Among vadous circuits coDstructed with rcsistor _R, inductor _L and capacitor C, the cicuit that gives maximum power dissipation is
If air core is replaced by an iron core in an inductor, its self-inductance is increased from 0.02 mH to 40 mH. The relative permeabiliry of iron is
If $B_c$ is the magnetic induction at the ceflte ofa circular coit carrying curreflt, then the magnetic induction at a poitrt oo the axis of the coil at a distance equal to the radius of the coil is
The hard ferromagnetic material among the following is
In Cyclotron, the frequency of revolution ofthe charged particle in a magnetic field is independent of
A current carrying coil placed in a magnetic field B experiences a torque τ. If θ is the angle between the normal to the plane of the coil and field B and φ is the flux linked with the coil, then
A conductor of length 20 cm carrying a curent of 5A is placed at an angle of 30° to the extemal magnetic field of 0.5 T. The.force acting on it is