Explore topic-wise InterviewSolutions in Current Affairs.

Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface

In the circuit shown in the Figure charge on $1\mu F$ and $3\mu F$ capacitors respectively is

Two bodies are thrown vertically upwards with their initial speeds in the ratio 2:3 . The ratio of the maximum heights reached by them and the ratio of their time taken by them to return back to the ground respectively are ___________________.(with explain)

A solid sphere of mass $m$ is kept between two planks rolls moving without slipping with the velocities as shown.





Determine the total kinetic energy of the solid sphere.

Toricelli’s barometer used mercury. Pascal duplicated it using French wine of density $984kg{m}^{–3}$ . Determine the height of the wine column for normal atmospheric pressure.

Find the maximum frequency of the X-rays emitted by an X-ray tube operating at 30KV.

The angle which a vector $\hat{i}-\hat{j}+\sqrt{2}\hat{k}$ makes with y - axis is

Find the equivalent resistance between points A and B of the following network shown in the given diagram?

When a uniform solid sphere and a disc of the same mass and of the same radius rolls down without slipping on a smooth inclined plane from rest to the same distance along the inclined plane, then the ratio of the time taken by solid sphere and the disc to cover the distance is

If in a stationary wave the amplitude corresponding to antinode is $4\text{cm}$, then the amplitude corresponding to a particle of medium located exactly midway between a node and an antinode is

In the figure shown below, if the block is a cube of side $1\text{m}$, then loss of mechanical energy during impact if the difference in vertical heights between the two horizontal surfaces is very small is:

One radian is equal to angle of

To $1.0L$ of $0.01M$ $N{H}_3$ solution, the following quantities of $1.0M$ $HCl$ is added. ($p{K}_b\left(N{H}_3\right)=4.74$)
List-I contains questions and List-II contains their answers.
$\begin{array}{cc}\text{List-I}& \text{List-II}\\ \text{Volume of HCl added}& \text{pOH}\\ \text{(I) 2.0 mL}& \text{(P) 11.0}\\ \text{(II) 5.0 mL}& \text{(Q) 4.14}\\ \text{(III) 10.0 mL}& \text{(R) 4.74}\\ \text{(IV) 11.0 mL}& \text{(S) 8.37}\\ & \text{(T) 8.20}\\ & \text{(U) 11.35}\end{array}$

Lenz’s law is a consequence of the law of conservations of :

Match $\text{List I}$ with the $\text{List II}$ and select the correct answer using the code given below the lists :



$\begin{array}{cccc}& \text{List I}& & \text{List II}\\ \text{(A)}& \text{Area of a triangle with adjacent sides determined by vectors}\overrightarrow{a}\text{and}\overrightarrow{b}\text{is}1\text{sq. unit}.\text{Then the area}& \text{(P)}& 6\\ & \text{(in sq. units) of the triangle with adjacent sides determined by}(3\overrightarrow{a}+4\overrightarrow{b})\text{and}(\overrightarrow{a}-3\overrightarrow{b})\text{is}& & \\ \text{(B)}& \text{Volume of parallelopiped determined by vectors}\overrightarrow{a},\overrightarrow{b},\overrightarrow{c}\text{is}\frac{1}{4}\text{cu. unit}.\text{Then the volume (in cu. units)}& \text{(Q)}& 9\\ & \text{of the parallelopiped determined by vectors}3(\overrightarrow{a}+\overrightarrow{b}),(\overrightarrow{b}+\overrightarrow{c}),4(\overrightarrow{c}+\overrightarrow{a})\text{is}& & \\ \text{(C)}& \text{Area of a parallelogram with adjacent sides determined by vectors}\overrightarrow{a}\text{and}\overrightarrow{b}\text{is}8\text{sq. units}.\text{Then the}& \text{(R)}& 13\\ & \text{area (in sq. units) of the parallelogram with adjacent sides determined by vectors}(2\overrightarrow{a}+\overrightarrow{b})\text{and}\overrightarrow{b}\text{is}& & \\ \text{(D)}& \text{Volume of tetrahedron determined by vectors}\overrightarrow{a},\overrightarrow{b}\text{and}\overrightarrow{c}\text{is}\frac{1}{2}\text{cu. unit}.\text{Then the volume}& \text{(S)}& 16\\ & \text{(in cu. units) of thetetrahedron determined by vectors}2(\overrightarrow{a}\times \overrightarrow{b}),3(\overrightarrow{b}\times \overrightarrow{c})\text{and}(\overrightarrow{c}\times \overrightarrow{a})\text{is}& & \end{array}$



Which of the following is a CORRECT combination?

Figure shows a Wheatstone bridge circuit. Which of the following correctly shows the currents $I_1,I_2$ and $I_3$ in the decreasing order of magnitude ?

Two blocks $A$ and $B$ each of equal mass $m$ are released from the top of a smooth fixed wedge as shown in figure. Find the magnitude of acceleration of $COM$ of the two blocks.

An EM wave from air enters a medium. The electric fields are ${\overrightarrow{E}}_1=E_{01}\hat{x}\cos \left[2\pi v(\frac{z}{c}-t)\right]$ in air and

${\overrightarrow{E}}_2=E_{02}\hat{x}\cos \left[k\right(2z-ct\left)\right]$ in medium, where the wave number $k$ and frequency v refer to their values in air. The medium is non-magnetic. If ${\epsilon }_{r_1}$ and ${\epsilon }_{r_2}$ refer to relative permitivities of air and medium respectively, which of the following options is correct?

In Kundt's tube experiment, a brass rod of length $1\text{m}$ is used and the average length of loop obtained in air is $10.3\text{cm}$ and in $C{O}_2$ is $8\text{cm}$. Calculate the speed of sound in brass and in $C{O}_2$.

Given, speed of sound in air is $350\text{m/s}$.

Two perfect gases at absolute temperatures $T_{1}and{T}_2$ are mixed. There is no loss of energy in this process. If $n_{1}and{n}_2$ are the respective number of molecules of the gases, the temperature of the mixture will be

A particle of specific charge (charge/mass) $\alpha$ starts moving from the origin from rest under the action of an electric field $\overrightarrow{E}=E_0\hat{i}$ and magnetic field $\overrightarrow{B}=B_0\hat{k}$. Its velocity at $(x_0,y_0,0)$ is $(4\hat{i}-3\hat{j})$. The value of $x_0$ is :

(All parameters are in SI unit.)

What is the change ln wavelength & velocity when light travells phically rarer to denser medium?

A boat which has a speed of $5m{s}^{-1}$ in still water crosses the river of width $25\text{m}$ in $10$ seconds. The boat is heading at an angle of $\alpha$ with downstream, where $\alpha$ is equal to

In the circuit given below, neglecting base emitter voltage $V_{BE}$, find the collector current.

An aeroplane is flying at a constant horizontal velocity of 600 km/hr at an elevation of 6 km towards a point directly above the target on the earth's surface. At an appropriate time, the pilot releases a ball so that it strikes the target at the earth. The ball will appear to be falling