List of top Physics Questions

A piece of wire of resistance $R$ is cut into n equal parts. These parts are then connected in parallel. If the equivalent resistance of the parallel combination is $R'$ , then $\big(\frac{R}{R'}\big) $ is
A particle is moving along a circular path of radius $5 \,m $ with a uniform speed $5\, ms^{ - 1 } $ What will be the average acceleration when the particle completes half revolution ?
Assuming that about $20.\,MeV$ of energy is released per fusion reaction ${ }_{1} H ^{2}+{ }_{1} H ^{3} \rightarrow{ }_{0} n^{1}+{ }_{2} He ^{4}$ then the mass of ${ }_{1} H ^{2}$ consumed per day in a fusion reactor of power $1\, MW $ will approximately be
There is a current of $40\, A$ in a wire of $10^{-6} \,m ^{2}$ area of cross-section. If the number of free electrons per cubic metre is $10^{29}$, then the drift velocity is
Two streams of protons move parallel to each other in the same direction. Then these
A machine gun is mounted on a $200 \,kg$ vehicle on a horizontal smooth road (friction negligible). The gun fires $10$ bullets/s with a velocity of $500 \,ms$ lf the mass of each bullet be $10\, g$, what is the acceleration produced in the vehicle?
Three blocks of masses $m_1, m_2$ and $m_3$ kg are placed in contact with each other on a frictionless table. A force $F$ is applied on the heaviest mass $m_1$; the acceleration of $m_3$ will be
A ray of light is incident on the surface of separation of a medium with the velocity oflight at an angle $45^{\circ}$ and is refracted in the medium at an angle $30^{\circ}$. What will be the velocity of light in the medium?
White light may be considered to be a mixture of wave with $\lambda$ ranging between $3000 \,?$ and $7800\,?$. An oil film of thickness $10,000\,?$ is examined normally by the reflected light. If $\mu=1.4$, then the film appears bright for
Two identical concentric rings each of mass $m$ and radius $R$ are placed perpendicularly. What is the moment of inertia about axis of one of the rings
The angle of minimum deviation for a prism is $40^{\circ} $ and the angle of the prism is $60^{\circ} $ . The angle of incidence in this position will be
Two identical concentric rings each of mass $m$ and radius $R$ are placed perpendicularly. What is the moment of inertia about axis of one of the rings
The angle of minimum deviation for a prism is $40^{\circ} $ and the angle of the prism is $60^{\circ} $ . The angle of incidence in this position will be
Sparkling of diamond is because of
Zener diode acts as
Consider a vehicle going on a horizontal road towards east. Neglect any force by the air. The frictional force on the vehicle by the road
In $L-C-R$ resonant circuit what is the phase angle $ \phi$ ?
What is size of gold nuclei?
A rod of length $L$ and mass $m$ is kept vertically on the ground. Its potential energy is
A body is moving forward and backward. Change in frequency observed by the body of a source is $2 \%$. What is velocity of the body? (Speed of sound is $300\, ms ^{1}$ )
An ideal gas is expanding such that $PT^2$ = constant. The coefficient of volume expansion of the gas is
A light beam is travelling from Region $I$ to Region $IV$ (Refer Figure). The refractive index in Regions $I, II, III$ and $IV$ are $n_0,\frac{n_0}{2},\frac{n_0}{6} \, \, and \, \, \frac{n_0}{8},$ respectively.The angle of incidence $\theta$ for which the beam just misses entering Region $IV$ is
A particle of mass $m$ and charge $q$, moving with velocity $V$ enters Region II normal to the boundary as shown in the figure. Region II has a uniform magnetic field B perpendicular to the plane of the paper. The length of the Region II is $I$. Choose the correct choice (s).
An ideal gas is expanding such that pT$^2$ = constant. The coefficient of volume expansion of the gas is
A vibrating string of certain length $l$ under a tension $T$ resonates with a mode corresponding to the first overtone (third harmonic) of an air column of length $75 \,cm$ inside a tube closed at one end. The string also generates $4\, beats/s$ when excited along with a tuning fork of frequency $n$. Now when the tension of the string is slightly increased the number of beats reduces to $2$ per second. Assuming the velocity of sound in air to be $340, m/s$, the frequency $n$ of the tuning fork in $Hz$ is