List of top Physics Questions asked in BHU UET

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

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

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?

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

A stationary particle explodes into two particles of masses $m_1$ and $m_2$ which move in opposite directions with velocities $v_1$ and $v_2$. The ratio of their kinetic energies $E_1 /E_2$ is

ln a Wheatstone's bridge all the four arms have equal resistance $R$. If the resistance of the galvanometer arm is also $R$, the equivalent resistance of the combination as seen by the battery is

In case of a forced vibration, the resonance wave becomes very sharp when the

A charge $q$ is located at the centre of a cube. The electric flux through any face is

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is $ \bigg( {where} \, k = \frac{1}{ 4 \pi \varepsilon_0}\bigg)$

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

"Parsec" is the unit of

Two spheres of masses $m$ and $M$ are situated in air and the gravitational force between them is $F$. The space around the masses in now filled with a liquid of specific density $3.$ The gravitational force will now be :

The potential energy of a simple harmonic oscillator when the particle is half way to its end point is - (where, $E$ is the total energy)

The acceleration due to gravity on the planet $A$ is $9$ times the acceleration due to gravity on planet $B. A$ man jumps to a height of $2\, m$ on the surface of $A.$ What is the height of jump by the same person on the planet $B$.

The acceleration due to gravity becomes $\left(\frac{g}{2}\right)$ where (g = acceleration due to gravity on the surface of the earth) at a height equal to

An equiconvex lens is cut into two halves along (i) $XOX'$ and (ii) $YOY'$ as shown in the figure. Let ${f, f', f'' }$be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.

Choose the correct statement from the following

A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1 mm, the increase in the energy of the wire will be

A spring balance and a physical balance are kept in a lift. In these balances equal masses are placed. lf now the lift starts moving upwards with constant acceleration, then

A sample of radioactive element has a mass of $10\, g$ at an instant $t = 0$. The approximate mass of this element in the sample after two mean lives is

A particle is thrown vertically upwards. Its velocity at half of the height is $ 10\, ms^{ - 1} $ . Then the maximum height attained by it is (Take $g = 10\,ms^{ -2} $ )

Barrier potential of $a p-n$ junction diode does not depend on