List of top Physics Questions

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
The output is low when either of the input is high, then this represents which of the following gates?
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
A solid sphere is rotating about a diameter at an angular velocity $ \omega . $ If it coots so that its radius reduces to $ \frac{1}{n} $ of its original value, its angular velocity becomes
A simple telescope consisting of an objective of focal length $60\, cm$ and a single eye lens of focal length $5\, cm$ is focussed on a distant object in such a way that parallel rays comes out from the eye lens. If the object subtends an angle $2^{\circ}$ at the objective, the angular width of the image is
A round uniform body of radius $R$, mass $M$ and moment of inertia $I$, rolls down (without slipping) an inclined plane making an angle $\theta$ with the horizontal. Then its acceleration
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is
Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $\left(E_{g}\right)_{c},\left(E_{g}\right)_{S i}$ and $\left(E_{q}\right)_{ Ge }$ respectively. Which one of the following relationships is true in their case?
In a reverse biased diode when the applied voltage changes by $1\, V$, the current is found to change by $0.5\, \mu\,A$ . The reverse bias resistance of the diode is