Explore topic-wise InterviewSolutions in Current Affairs.

A telephonic communication service is working at carrier frequency of $10GHz$. Only $10\%$ of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of $5kHz$ ?

X-rays of wavelength $\lambda$ are incident normally on a crystal and the second order reflection of diffraction from the crystal is observed at an angle of ${45}^{\circ }$. The lattice constant of the crystal is

The particles are separated at a horizontal distance $x$ as shown in the figure. They are projected at the same time as shown in the figure with different initial speeds. The time after which the horizontal distance between the particles become zero is

If the surface shown in the figure is frictionless and the strings are inextensible, then the ratio of tensions $T_1$ and $T_2$ in the string is

A single solar cell of dimension $(10\text{cm}\times 10\text{cm})$ produces a voltage of $0.5\text{V}$ and current $2.5\text{A}$. The intensity of light absorbs by cell is $800{\text{W/m}}^2$. The efficiency of cell is -

a person sitting in the satellite feels weightlessness but a person standing on the moon has weight though the moon is also a satellite of the earth. why?

The velocity time graph of the motion of the body is shown in the figure. The total displacement travelled by the body during the motion is

It is found that yellow light does not eject photoelectrons from a metal. It is advisable to try with __ light. (orange/green)

A charged particle having drift velocity of $7.5\times {10}^{-4}{\text{ms}}^{-1}$ in an electric field of $3\times {10}^{-10}{\text{Vm}}^{-1}$, has a mobility of (in${\text{m}}^2{\text{V}}^{-1}{\text{s}}^{-1}$)

A frequency modulated signal with a carrier frequency of 10 MHz and a modulation index of 20 rad is to be generated using an indirect FM modulator shown in the figure below.

If the input message signal is a 15 kHZ sinusoid, then the maximum frequency deviation required at the output of the NBFM generator will be equal to kHz.

1. 3

The density of a linear rod of length L varies as

$\rho$ = A + Bx where x is the distance from the left end.

Locate the centre of mass.

Find the efficiency of the thermodynamic cycle shown in figure for an ideal diatomic gas.

Two radioactive materials $X_1$ and $X_2$ have decay constant 10 $\lambda$ and $\lambda$ respectively. If initially they have same number of nuclei, then ratio of number of nuclei $X_1$ and $X_2$ will be $\frac{1}{e}$ after a time

A solid sphere of mass $m$ and radius $r$ is placed inside a hollow thin spherical shell of mass $M$ and radius $R$ as shown in figure. A particle of mass $m^{\prime }$ is placed on the line joining the two centres at a distance $x$ from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if $x>2R$.

1. 1.7

In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across $52cm$ of the potentiometer wire. If the cell is shunted by the resistance of $5\Omega$, a balance is found when the cell is connected across $40cm$ of the wire. Find the internal resistance of the cell.

Ten ants are on the real line. At time $t=0$, the $k$-th ant starts at the point $k^2$ and travelling at uniform speed, reaches the point $(11–k{)}^2$ at time $t=1$. The number of distinct times at which at least two ants are at the same location is

Why were electrons coming out from a metal when it was kept under a light source?

Statement 1: The flux of a point charge ‘q’ located at origin, is positive through a point p (1, 2, 4)

Statement 2: The flux of a point charge ‘q’ located at origin is negative through a point P (1,2,4)

The value of $\underset{0}{\overset{1}{\int }}\frac{2x^2+3x+3}{(x+1)(x^2+2x+2)}dx$ is

A car has two travellers of masses $m_1$ and $m_2$. If the car moves towards east with acceleration ${}^{\prime }{a}^{\prime }$, find pseudo force on $m_1$ as observed by traveller of mass $m_2$

The co-efficient of friction between a block of mass $m_2$ and inclined plane is $\mu$. Mass $m_1$ connected to $m_2$ by an inextensible string will starts moving downwards if

A closed organ pipe of length $l$ is vibrating in $3^{rd}$ overtone with amplitude of antinode being ${}^{\prime }{a}^{\prime }$. Amplitude at a distance $\frac{l}{7}$ from the closed end is

When an ideal gas undergoes unrestrained expansion, no cooling occurs because ___

A charged particle moves in a gravity free space without change in velocity. Which of the following is not possible in that space?

What are the initial position vector ${\overrightarrow{r}}_i$ and final position vector ${\overrightarrow{r}}_f$, both in unit-vector notation? What is the x component of displacement $\Delta \overrightarrow{r}$?

Force versus displacement curve is shown in the diagram. Find the final velocity of the particle of mass $5\text{kg}$ at the end of $30\text{m}$, if it is moving initially with $2\text{m/s}$.

If in case $A$, elongation in wire of length $L$ is $\Delta L$, then for the same wire, elongation in case $B$ will be

The position vector of a moving particle in $x-y$ plane can be represented as $\overrightarrow{r}=\left(2t\hat{i}+2t^2\hat{j}\right)m$, where $t$ represents the time instant. The rate of change of $\theta$ at time $t=2s$. (where $\theta$ is the angle which its velocity vector makes with positive $x-$axis)