List of top Physics Questions asked in BHU UET

Calorie is defined as the amount of heat required to raise the temperature of $1 \,g$ of water by $1^{\circ} C$ and it is defined under which of the following conditions?
The longest wavelength line in the Lyman series of the hydrogen spectrum is
In a potentiometer of one- metre length, an unknown emf voltage source is balanced at $60 \,cm$ length of potentiometer wire, while a $3 \,V$ battery is balanced at $45 \,cm$ length. Then the emf of the unknown voltage source is
A charge $Q$ is uniformly distributed over a large square plate of copper. The electric field at a point very close to the centre of the plate is 10 $ Vm^{ -1}$. If the copper plate is replaced by a plastic plate of the same geometrical dimensions and carrying the same charge $Q$ uniformly distributed, then the electric field at the point $P$ will be
Figure below show regular haxagons, with charges at the vertices. In which case is the electric field at the centre zero ?
$1\, g$ of water on evaporation at atmospheric pressure forms $ 1671\,c{{m}^{3}} $ of steam. Heat of vaporisation at this pressure is $ 540\,cal\,{{g}^{-1}} $ . The increase in internal energy is
A charged dust particle of radius $ 5\times {{10}^{-7}}m $ is located in a horizontal electric field having an intensity of $ 6.28\times {{10}^{5}}V{{m}^{-1}} $ . The surrounding medium is air with coefficient of viscosity $ \eta =1.6\times {{10}^{-5}}N-s{{m}^{-2}} $ . If this particle moves with a uniform horizontal speed $ 0.02\,m{{s}^{-1}} $ . Find the number of electrons on it.
Ultraviolet light wavelength $300 \,nm$ and intensity $1.0 \,Wm ^{-2}$ falls on the surface of a photoelectric material. If one percent of the incident photons produce photoelectrons, then the number of photoelectrons emitted per second from an area of $1.0 \,cm ^{2}$ of the surface is nearly
A toroidal solenoid with an air core has an average radius of $15 \,cm,$ area of cross-section $12\,cm^2$ and $1200$ turns. Ignoring the field variation across the cross-section of the toroid, the self-inductance of the toroid is
The given four terminal network is part of a larger circuit. The points $A, B, C$ are at the same potential. The potential difference between any one of $A, B $ or $C$ and $D$ is $40\, V$. The potential difference between $A$ and $O$ is
A table tennis ball which has been covered with a conducting paint is suspended by a silk thread so that it hangs between two metal plates. One plate is earthed. When the other plate is connected to a high voltage generator, the ball
The speed of sound in hydrogen at NTP is $1270 \,ms$ Then, the speed in a mixture of hydrogen and oxygen in the ratio $4 : 1$ by volume will be
A body of mass 10 kg initially at rest acquires velocity $10 ms^{-1}$. What is the work done
A dip needle arranged to move freely in the magnetic meridian dips by an angle $\theta$. If the vertical plane in which the needle moves is rotated through an angle $\alpha$ to the magnetic meridian, then the needle will dip by an angle
If the total magnetic field due to earth is $28 \,Am$, then the total magnetic induction due to earth is
Which of the following statements is/are true?
When the bob of a simple pendulum swings, the work done by tension in the string is
Two vessels $A$ and $B$ having equal volume contain equal masses of hydrogen in $A$ and helium in $B$ at $300 \,K$. Then, mark the correct statement.
In non-resonant circuit, what will be the nature of the circuit for frequencies higher than the resonant frequency?
In an adrabatic process wherein pressure is increased by $\frac{2}{3} \%$. If $\frac{C_{p}}{C_{V}}=\frac{3}{2}$, then the volume decreases by about
If the series limit wavelength of the Lyman series for hydrogen atom is $ 912\,?$ then the series limit wavelength for the Balmer series for the hydrogen atom is
An ideal gas is taken through a cyclic thermodynamical process through four steps. The amounts of heat involved in these steps are $Q_{1}=5960 \,J , Q_{2}=-5585 \,J , Q_{3}=-2980\, J$ $Q_{4}=3645\, J$; respectively. The corresponding works involved are $W_{1}=2200\, J , W_{2}=-825\, J, W_{3}=-1100 \,J$ and $W_{4}$ respectively. The value of $W_{4}$ is
A water drop is divided into $8$ equal droplets. The pressure difference between the inner and outer side of the big drop will be
A pure semiconductor behaves slightly as a conductor at
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