List of top Physics Questions asked in COMEDK

Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of $10$ and the second has a voltage gain of $20$. If the input signal is $0.01\, volt$, what is the output $ac$ signal ?

Three charges $-q, +Q$ and $-q$ are placed at equal distances along a straight line. If the total $P.E.$ of the system is zero, the ratio $ \frac{Q}{q} $ becomes

The electric force between two point charges separated by a certain distance d in air is F.The distance at which they should be placed in a medium of relative permittivity k so that the force remain the same is

Reverse saturation current of diode

Photoelectric Effect and Raman Effect can be explained on the basis of

Transpiration Cohesion tension theory operates in ............

Two concentric circular coils, each having 10 turns with radii 0.2 m and 0.4 m carry currents 0.2 A and 0.3 A respectively in opposite directions. Magnetic field at the centre is

Material of permanent magnet has

The excess pressure inside a soap bubble is three times than excess pressure inside a second soap bubble, then the ratio of their surface area is

Resonant frequency of a series LCR circuit is 600 Hz. Quality factor of the circuit is 4. Band width is

To have large selectivity in a series LCR circuit

The electrostatic force between two charges of $10\,\mu C$ and $20\,\mu C$ at a distance of $2m$ is to be halved. This can be effected by

The tidal waves in the sea are primarily due to