Explore topic-wise InterviewSolutions in Current Affairs.

How
many neutrons and protons are there in the following nuclei?

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The light ray is incident at an angle of ${60}^{\circ }$ on a prism of angle ${45}^{\circ }$. When the light ray falls on the other surface at ${90}^{\circ }$, the refractive index of the material of prism $\mu$ and the angle of deviation $\delta$ are given by

The de Broglie wavelength of a golf ball weighing 0.2 kg and moving with a speed $1.4\times {10}^{-3}$ $m{s}^{-1}$ Is about:

Which of these statements is/are true about internal energy (Eint) of a system of gas?

A very long straight conductor has a circular cross-section of radius R . Inside the conductor there is a cylindrical hole of radius ‘a’ whose axis is parallel to the axis of the conductor and at a distance ‘b’ from it, as shown in the diagram .The conductor with hole carries current i. Let the z-axis be the axis of conductor and the axis of the hole at , Match the following column.

$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ P)\text{Magnitude of magnetic field at point P(2R,0)}& 1)\text{Zero}\\ Q)\text{X-Component of magnetic field at point P(0,0)}& 2)\frac{{\mu }_{0}i}{2\pi b}\left(\frac{a^2}{R^2-a^2}\right)\\ R)\text{Magnitude of magnetic field at point P(0,0)}& 3)\frac{{\mu }_{0}i}{2\pi (R^2-a^2)}(\frac{a^2}{2R-b}-\frac{R}{2})\\ S)\text{Magnitude of magnetic field at point P(0,0)}& 4)\frac{{\mu }_{0}ib}{2\pi (R^2-a^2)}\end{array}$

In an $\text{AC}$ circuit, the impedance is $\sqrt{3}$ times the $R$. Then, the phase angle is

A thin uniform rod of mass $10\text{kg}$ is rotating about an axis passing through the end point of the rod of length $6\text{m}$ as shown in figure. Find the moment of inertia of the rod about this axis.

In the figures shown below x, y and z are the deflections under A, B and C due to loads P and Q. x', y' and z' are the deflection under A, B and C due to unit load at C. The deflection z would equal to

A sound signal is simultaneously sent in air and water from a boat on a river. The echo of sound returned by the river bed is heard is $4\text{s}$, while the echo returned by the aeroplane is heard in $8\text{s}$. Find the distance between the aeroplane and the river bed.



[velocity of sound in air = $350\text{m/s}$, velocity of sound in water = $1500\text{m/s}$]

If the threshold wavelength for sodium is $5420\stackrel{\circ }{A}$, then the work function of sodium is

A small metal bead (radius $0.5mm$), initially ${100}^{\circ }C$, When placed in a stream of fluid at ${20}^{\circ }C$ attains a temperature of ${28}^{\circ }C$ in$4.35second.$ The density and specific heat of the metal are $8500kg/m^3$ and $400J/kgK,$ respectively. If the bead is considered as lumped system, the convective heat transfer coefficient (in $W/m^{2}K$) between the metal bead and the fluid stream

A particle when projected in vertical plane moves along the smooth surface with initial velocity 20 m/s at an angle of ${60}^o$, so that its normal reaction on the surface remains zero throughout the motion. Then the slope of the tangent to the surface at height 5 m from the point of projection will be:

The vector sum of two forces is perpendicular to their vector differences. In that case, the force

A fly flies from a point $P(0,4,6)$ to the point $Q(2,1,4)$. The magnitude of displacement covered by it is

1. 434.6

A source of sonic oscillations with frequency $n=1700Hz$ and a receiver are located on the same normal to a wall. Both the source and the receiver are stationary, and the wall recedes from the source with velocity $u=6.0cm/s$. Then the beat frequency registered by the receiver is approximately (velocity of sound is $v=340m/s$)

In an a. c. circuit, the instantaneous e.m.f. and current are given by $e=100sin30t$

$i=20sin(30t-r/4)$. In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively.

$y=cos{x}^3,then\frac{dy}{dx}$=?

A uniform $T$ shaped object with the dimensions shown in figure, is lying on a smooth $xy$ plane. The object undergoes translational motion only, when a force of $50\text{N}$ is applied along $x$-direction. The location of the force with respect to point $\text{R}$ is

Rain is falling vertically with a speed of $12m{s}^{-1}$.A cyclist is moving east to west with a speed of $12\sqrt{3}m{s}^{-1}$.In order to protect himself from rain at what angle he should hold his umbrella w.r.t vertical.