Explore topic-wise InterviewSolutions in Current Affairs.

A tank is filled with water and two holes $A$ and $B$ are made in it. For getting same range, ratio of $\frac{h^{\prime }}{h}$ is

A steel wire of length 1 m, mass 0.1 kg and uniform cross-sectional area ${10}^{-7}{m}^2$ is rigidly fixed at both ends. The temperature of the wire is decreased by $80/3^{\circ }C$. If transverse waves are set up in the wire, the frequency (in Hz) is ___ .

The Young’s modulus of steel = $2\times {10}^{11}N{m}^{-2}$ and coefficient of linear expansion of steel = $1.2\times {10}^{-5}pe{r}^{\circ }C$.

A circular track of radius 600 m is to be designed for cars at an average speed of 180 km/hr. What should be the angle of banking of the track?

A coil of resistance $20\Omega$ and inductance $5H$ has been connected to a $100V$ battery The energy stored in the coil after a long time is

A metallic block of density $5gmc{m}^{-3}$ and having dimensions $5cm\times 5cm\times 5cm$ is weighed in water. Its apparent weight will be (in dyne)

A square loop of edge $b$ made of a uniform wire. Current $I$ enters the loop at point $A$ and leaves at $C$. Find the net magnetic field at the point $P$ which is on the perpendicular bisector of $AD$ at a distance of $b/3$ from it.

Two identical cylindrical vessels, with their bases at the same level, each contain a liquid of density $\rho$. The height of the liquid in one vessel is $h_1$ and that in the other is $h_2$. The area of either base is A. What is the work done by gravity in equalizing the levels when the vessels are interconnected?

${10}^{-3}$ W of $5000\text{Å}$ Light is directed on a photoelectric cell. If the current in the cell is $0.16$ μA, the percentage of incident photons which produce photoelectrons, is

While light is used to illuminate the two slits in Young's double slit experiment. The separation between the slits is d and the distance between the screen and the slit is D (>> d). At a point on the screen directly in front of one of the slits, certain wavelengths are missing. The missing wavelengths are (here m=0, 1, 2, .....is an integer)

The equation of a simple harmonic motion is X = 0.34 cos ( 3000 t + 0.74 ) where X and t are in mm and sec. The frequency of motion is

If $\overrightarrow{B}$ is added to $\overrightarrow{A}$, the result is $6.0\hat{i}+1.0\hat{j}$.If $\overrightarrow{B}$is subtracted from $\overrightarrow{A}$, the result is $-4\hat{i}+7.0\hat{j}$. What is the magnitude of $\overrightarrow{A}$?

A liquid of density $\rho$ and surface tension $\sigma$ rises to a height $h$ in a capillary tube of diameter $d$. The weight of the liquid in the capillary tube is:
(Consider liquid to be perfectly wetting in nature.)

For the given uniformly charged ring, which of the following curve of electric field $\left(E\right)$ versus distance from the centre of ring $\left(x\right)$ along $x-$ axis is correct?

[Consider only right side of ring]

A particle moves half the time of its journey with velocity $u$. The rest of the half time it moves with two velocities $V_1$ and $V_2$ such that half the distance it covers with $V_1$ and the other half with $V_2$. Find the net average velocity. Assume straight line motion.

An air column at temperature of ${51}^{\circ }\text{C}$ produces $4$ beats in one second with a tuning fork.

When the temperature of the air column decreases to ${16}^{\circ }\text{C}$ then one beat per second is produced with same tuning fork. The frequency of the tuning fork is

A tube is attached as shown in closed vessel containing water. The velocity of water (in m/s) coming out from a small hole is ___ .

A current carrying conductor of mass $m$ is floating in air such that it is making an angle $\theta$ with the direction of magnetic field. The conductor and uniform magnetic field both lie in horizontal plane. Then the value of current $i$ in the conductor will be:$($length of conductor is $l$, magnetic field induction is $B)$

Which of the following electric field configurations describes the lines of force in an electric field between two parallel plates of opposite charge?

Two bodies A and B have masses M and m, respectively where M > m and they are at a distance apart. Equal force is applied to each of them so that they approach each other. The position where they hit each other is

The objective lens of an astronomical telescope has a focal length of $100\text{cm}$. The telescope is focused for normal vision of distant objects when tube length is $1.1\text{m}$. Find the magnifying power of the telescope.

A glass slab of referactive index $\mu =1.5$ and thickness of 15 cm is placed in front of a convex mirror as shown in figure.





The distance between the actual position of pole and image of object $O$ as seen by the observer will be:

Water flows through a horizontal tube as shown in figure. If the difference of heights of water column in the vertical tubes is $4\text{cm}$, and the cross-sectional area $A_1$ and $A_2$ are $4{\text{cm}}^2$ and $2{\text{cm}}^2$ respectively, find the rate of flow of water across any section.

Take $g=9.8{\text{m/s}}^2,\sqrt{2613.33}=51.12$ for calculation.

The angle between the diagonals of the parallelogram formed by the points $(1,2,3),(-1,-2,-1),(2,3,2),(4,7,6)$ is

The arrangement of pulley-block system is released from rest at $t=0$ as shown in figure. The velocity of block $B$ is $v_B=45\text{m/s}$ upwards at some instant. Then, find the magnitude of velocity of block $A$ in $\text{m/s}$. Consider the string to be massless and inextensible, all pulleys are light and smooth.

Figure shows a rod of length $\text{20 cm}$ pivoted near an end and which is made to rotate in a horizontal plane with a constant angular spped. A ball of mass $m$ is suspended by a string also of length $\text{20 cm}$ from the other end of the rod . If the angle $\theta$ made by the string with the vertical is ${30}^{\circ }$, find the angular speed of rotation. Take $g=10{\text{m/s}}^2$

A mixture of ideal gases has 2 moles of Helium, 4 moles of Oxygen and 1 mole of Ozone at absolute temperature $T$. The internal energy of mixture is

An electron is taken from point A to point B along the path AB in a uniform electric field of intensity $E=10V{m}^{-1}$. Side AB = 5 m and side BC = 3 m. Then, the amount of work done on electron is

A solid sphere with uniform charge distribution, of self energy $U_0$ and radius $R$ is divided into $n$ number of smaller spheres of radius $r$. The self energy of each smaller sphere is

An $\text{LCR}$ series circuit with $100\Omega$ resistance is connected to an $A.C.$ Source of $200\text{V}$ and angular frequency $300{\text{rad s}}^{-1}$. When only the capacitor is removed, the current lags behind the voltage by ${60}^{\circ }$. When only inductor is removed, the current leads the voltage by ${60}^{\circ }$. If all elements are connected, the current in the circuit is

Ten positively charged particles are kept fixed on the x - axis at points $x=10cm,20cm,30cm,\cdots ,100cm.$The first particle has a charge $1.0\times {10}^{-8}C,$ the second $8\times {10}^{-8}C,$ the third $27\times {10}^{-8}C,$ and so on. The tenth particle has a charge $1000\times {10}^{-8}C.$ Find the magnitude of the electric force acting on a 1 C charge placed at the origin.

A long solenoid has $800$ turns per metre length of solenoid. A current of $1.6\text{A}$ flows through it.



$\left(ii\right)$ Find the value of magnetic field at the centre of the solenoid.



​​​​​​​$[$1 Mark$]$

In a Young's double slit experiment for interference of light, the slits are $0.2\text{cm}$ apart and are illuminated by yellow light$(\lambda =600\text{nm})$. What would be the fringe width on a screen placed $1\text{m}$ from the plane of slits if the whole system is immersed in water of refractive index $\frac{4}{3}.$

Four point charges $-Q,-q,2q$ and $2Q$ are placed, one at each corner of the square. The relation between $Q$ and $q,$ for which the potential at the centre of the square is zero is