List of top Physics Questions

In forward biased if the $ p-n $ junctions diode is forward biased, then width of potential barrier in $ p-n $ junction diode :
Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-ray then the pattern reveals
The phenomenon of rotation of plane polarised light is called
A particle performing uniform circular motion has angular momentum $L$. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is
A particle covers $150\, m$ in $8^\text{th}$ second starting from rest, its acceleration is:
A neutron makes a head-on elastic collision with a stationary deuteron. The fractional energy loss of the neutron in the collision is
A marble block of mass $2 \,kg$ lying on ice when given a velocity of $6\, m/s$ is stopped by friction in $10\, s$. then the coefficient of friction is
A lead shot of $1\, mm$ diameter falls through a long column of glycerine. The variation of its velocity $v$ with distance covered is represented by
A horizontal force of $10\, N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. The weight of the block is
Chronometer measures:
Which one is not a unit of time?
Quality depends on:
Two closed organ pipes $100\, cm $ and $101 \,cm$ long gives $16$ beats in $20 \,s$, when each pipe is sounded in its fundamental mode. Calculate the velocity of sound:
A body measures $5\,N $ in air and $2\,N$ when put in water. The buoyant force is:
Absolute zero is the condition at which:
The practical unit of resistance is $ \Omega .1 \, \Omega $ is equal to:
A black body, at a temperature of $227^{\circ} C$, radiates heat at a rate of $20 \,cal\, m ^{-2} s ^{-1} .$ When its temperature is raised to $727^{\circ} C$, the heat radiated by it in $cal \,m ^{-2} s ^{-1}$ will be closest to
A double slit experiment is performed with light of wavelength $500\, nm$. A thin film of thickness $2\, \mu m$ and refractive index $1.5$ is introduced in the path of the upper beam. The location of the central maximum will
A beam of charged particles is employed in the treatment of cancer. Charged particles on passing through a material medium lose their energy by causing ionization of the atoms along their path.
The motion of planets in the solar system is an example of conservation of
A rectangular loop carrying a current $i_{1}$, is situated near a long straight wire carrying a steady current $i_{2}$. The wire is parallel to one of the sides of the loop and is in the plane of the loop as shown in the figure. Then the current loop will
The resistivity of a semiconductor increases with temperature. The atoms of a semiconductor vibrate with large amplitude at higher temperatures there by increasing its resistivity.
The difference in the lengths of a mean solar day and a sidereal day is about
In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer having electron density $10^{11}$ per $m ^{3}$ ?
In an ideal parallel $LC$ circuit, the capacitor is charged by connecting it to a $DC$ source which is then disconnected. The current in the circuit