Explore topic-wise InterviewSolutions in Current Affairs.

In adiabatic container with adiabatic massless piston, containing 4 gm $N_2$ gas and 0.8 gm He gas are separated by a weakly conducting light partition. Both piston and partition are free to move. Initial temperature of $N_2$ and He gases are $‘3T_0^{\prime }$ and $‘T_0^{\prime }$ respectively. Initially, system is at rest and in equilibrium. Final temperature of the gas is

A man of mass $100kg$ standsat the rim of a turntable of radius 2 $m$ and moment of inertia $4000kg{m}^2$ mounted on a vertical frictionless shaft at its center. The whole system is initially at rest. The man now walks along the outer edge if the turntable(anticlockwise) with a velocity of $1m/s$ relative to earth. Through what angle will it have rotated when the man reaches his initial position relative to earth?

The electric flux from a cube of edge $l$ is $\varphi$. If edge of the cube is made $2l$ and charge enclosed is halved, then the flux value will be

The amount of heat radiated per second by a body of surface area $20c{m}^2$ kept at temperature $27{}^{o}C$ is H and wavelength having maximum share of emission is $\lambda ,$ find H and $\lambda$ approximately
(e = emissivity = 0.6, $\sigma =6\times {10}^{-6}\frac{watt}{m^2{K}^4}$
Wein's constant $=0.288cm-K$)

Two bodies are in equilibrium when suspended in water from the arms (equal length) of a balance (in balanced condition). The mass of one body is $36\text{g}$ and its density is $9\frac{g}{c{m}^3}$. If the mass of the other body is $48\text{g}$, its density in $\frac{g}{c{m}^3}$ is

A cubical block of wood of edge $3\text{cm}$ floats in water. The lower surface of the cube just touches the free end of a vertical spring fixed at the bottom of the pot. Find the maximum weight that can be put on the block without wetting it.

(Take density of wood $=800{\text{kg/m}}^3$, spring constant of the spring $=50\text{N/m}$ and $g=10{\text{m/s}}^2$.)

If the emitter current is changed by $4\text{mA}$, the collector current changes by $3.5\text{mA}$, the value of $\beta$ will be -

If $24$ cells each of internal resistance $I$ $\Omega$ are to be connected in series and parallel combination to get the maximum power output across a load of $10$ $\Omega$. If $x$ represents the number of rows and $y$ represents the number of cells in each row. Which of the following relation between $x$ and $y$ is correct?

In the arrangement shown in the figure, a block of mass $m$ is rigidly attached to two identical springs of stiffness constant $K$ each. The other ends of the springs are connected to fixed walls. The block is initially at rest and can slide on a frictionless horizontal bar $AB$ when displaced. The arrangement rotates with a constant angular velocity $\omega$ about an axis passing through the middle of the bar. Find the time period of small oscillations of the block.

Find the least pulling force acting at an angle of ${30}^{\circ }$ with the horizontal, which can just slide a body of mass $10\text{kg}$ along a rough horizontal surface $[{\mu }_s={\mu }_k=\frac{1}{\sqrt{3}},g=10m/s^2]$

Velocity time graph of a particle in straight line motion is in shape of a semicircle of radius $R$ as shown in figure. Its average acceleration from $t=0$ to $t=R$ is

The correct match between the entries in column I and column II are

Solar radiation emitted by sun resembles to that emitted by a black body at a temperature of $6000\text{K}$. Maximum intensity is emitted at a wavelength of about $4800\AA$. If the sun is cooled down from $6000\text{K}$ to $3000\text{K}$, then the peak intensity would occur at a wavelength of

Water enters a pipe with inlet diameter of $1.5\text{cm}$ at an absolute pressure of $5\times {10}^5\text{Pa}$. The outlet of the pipe is $1\text{cm}$ in diameter and is at height of $6\text{m}$ above the inlet. When the flow speed at the inlet pipe is $2\text{m/s}$. Find the flow speed $\left(\text{m/s}\right)$ and pressure $\left(\text{Bar}\right)$ at the outlet of the pipe. (Take $g=10{\text{m/s}}^2$)

A series RLC circuit has a bandwidth of $300\text{rad/s}$ at a resonance frequency of $3000\text{rad/s}$ when excited by a voltage source of $100\text{V}$. The inductance of the coil is $0.1\text{H}$. The quality factor is -

Analyze the given data:



The function that models the given data is.

Show that the right circular cone of least curved surface area and given volume has an altitude equal to $\sqrt{2}$ times the radius of the base.

A conducting rod of length $L$ and mass $m$ is moving down a smooth inclined plane of inclination $\theta$ with constant speed $V$. A current $I$ is flowing in the conductor perpendicular to the paper and pointing inwards. A uniform magnetic field directed vertically upwards exists in the space. The magnnitude of magnetic field $B$ is:

Both springs, string and pulley shown in the figure are light. Initially when both the springs were in their natural state, the system was released from rest. The maximum displacement of the block having mass $m$ is:

The activity of a radioactive sample is $A_1$ at time $t_1$ and $A_2$ at time $t_2$. If $T_{av}$ is the average life time of the radioactive sample, then the number of atoms that decay during interval $(t_2-t_1)$ is

Two neutral spheres are kept side by side, now 150 electrons are transferred from one to other, find the magnitude of charge on one sphere.

Two charges 5 ×
10⁻⁸ C and −3 × 10⁻⁸ C
are located 16 cm apart. At what point(s) on the line joining the two
charges is the electric potential zero? Take the potential at
infinity to be zero.

When a ball is thrown up vertically with velocity $v_0,$ it reaches a maximum height of $h$. If one wishes to triple the maximum height, then the ball should be thrown with velocity.

A magnet of magnetic moment $\left(50\hat{i}\right){\text{A-m}}^2$ is placed in a uniform magnetic field given by, $\overrightarrow{B}=(0.5\hat{i}+0.3\hat{j})\text{T}$. The torque acting on the magnet is,

A photon of wavelength $4\mathring{\text{A}}$ strikes an electron at rest and scattered at an angle of ${120}^{\circ }$ to the original direction. The new wavelength $\left(\text{in}\mathring{\text{A}}\right)$ of the photon after collision is :

[Take $h=6.63\times {10}^{-34}\text{Js};m_0=9.1\times {10}^{-31}\text{kg}$]