List of top Physics Questions asked in JEE Main, KCET

The refractive index of a particular material is $1.67$ for blue light, $1.65$ for yellow light and $1.63$ for red light. The dispersive power of the material is .........
A man, standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is $340 \,ms ^{-1}$, the distance between the cliffs is ..........
Curie-Weiss law is obeyed by iron at a temperature ...........
When light is incident on a diffraction grating the zero order principal maximum will be _____
Rainbow is formed due to.............
When a body is earth connected, electrons from the earth flow into the body. This means the body is .............
The emitter-base junction of a transistor is ............. biased while the collector-base junction is ............. biased.
13 resistors each of resistance $R\,\Omega$ are connected in the circuit as shown in figure. The effective resistance between A and B is
As a result of interference of two coherent sources of light, energy is
When 100 V d.c. is applied across a coil, a current of 1 A flows through it. When 100 V a.c. of 50 Hz is applied to the same coil only 0.5 A flows. The inductance of the coil is
A wire in the form of a circular loop of one turn carrying a current produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
If both the mass and radius of the earth decrease by $1%$. then
Weight of a body of mass m decreases by $1%$ when it is raised to height $h$ above the earth's surface. If the body is taken to a depth $h$ in a mine, change in its weight is
The displacement-time graph of a particle executing SHM is as shown in the figure The corresponding force-time graph of particle is
A charged particle moves along the line AB which lies in the same plane of a circular loop of conducting wire as shown in the figure above. Then
The inward and outward electric flux from a closed surface are respectively $8\times 10^3$ and $4\times 10^3$ unit. Then the net charge inside the closed surface is
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of circle in centimetre is
A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is $10^{-7} $ ohm metre and the current passing through it is 0.1 ampere. Cross-section of the wire is $10^{-8}\,m^2$. The potential gradient along the potentiometer wire is
Two wires of same dimensions but resistivities $\rho_1$ and $\rho_2$ are connected in series. The equivalent resistivity of the combination is
A charge $q$ is placed at the centre of line joining two equal point charges each equal to $+Q$. The system of $3$ charges will be in equilibrium if $q$ is equal to
In the circuit shown, the effective capacitance between A and B is
Three vectors satisfy the relation $\overrightarrow{A}.\overrightarrow{B}=0$ and $\overrightarrow{A}.\overrightarrow{C}=0$ then $\overrightarrow{A}$ is parallel to
The time taken by AC of 50 Hz in reacting from zero to the maximum value is
The aperture of objective lens of a telescope is made large so as to
The phenomenon of rotation of plane polarised light is called