List of top Physics Questions

If light is a longitudinal wave, it cannot explain
If the critical angle for total internal reflection from medium to vacuum is $ 30{}^\circ $ , the velocity of light in medium is
If average velocity becomes $4$ times then what will be the effect on rms velocity at that temperature?
In a potentiometer the null point is obtained at $7^\text{th}$ wire. If now we have to change the null point at $9^\text{th}$ wire, what should we do?
The output is low when either of the input is high, then this represents which of the following gates?
The earth moves in an elliptical orbit with the sun $S$ at one of foci as shown in the figure. Its rotational kinetic energy is maximum at the point
Reverberation time does not depend upon
If $B_{H}=\frac{1}{\sqrt{3}} B_{v}$, find angle of dip. (where symbols have their usual meanings)
Graph of input characteristic of common emitter amplifier is
If $C_p$ and $C_v$ denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then
If a solid sphere of mass $1 \,kg$ and radius $0.1\, m$ rolls without slipping at a uniform velocity of $1\, m/s$ along a straight line on a horizontal floor, the kinetic energy is
For two resistance wires joined in parallel, the resultant resistance is $ \frac{6}{5}\Omega . $ When one of the resistance wires breaks the effective resistance becomes $ 2\,\Omega $ The resistance of the broken wire is
For the given uniform square lamina $ABCD$, whose centre is $O$,
For high frequency, capacitor offers
Diameter of human eye lens is $2 \,mm$. What will be the minimum distance between two points to resolve them, which are situated at a distance of $50 \,m$ from eye? The wavelength of light is $5000\,??.
Voltmeter is connected in parallel with the circuit Resistance of a voltmeter is very large.
Optical fibres are used for telecommunication Optical fibres are based on the phenomenon of total internal reflection.
NAND is a universal gate. It can be used to describe all other logic gates.
n: Light emitting diode $(LED)$ emits spontaneous radiation. : $LED$ are forward biased p-n junctions.
An astronaut experience weightlessness in a space satellite. When a body falls freely it does not experience gravity.
A white source of light during interference forms only white and black fringes. Width of fringe is inversely proportional to the wavelength of the light used.
An electron and proton enter a magnetic Held perpendicularly. Both have same kinetic energy. Which of the following is true?
A tuning fork of frequency $340\,Hz $ is vibrated just above the tube of $120\,cm $ height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? (speed of sound in air $ =340\,m/s $ )
A thermoelectric refrigerator works on
A stone is dropped from a height $h$ simultaneously, another stone is thrown up from the ground which reaches a height $4h$ . The two stones cross each other after time