Explore topic-wise InterviewSolutions in Current Affairs.

What is earth's charge ?

Can we use it to light an LED ?The reverse of.Earthing

In a certain region of space, the gravitational field is given by $-\frac{k}{r}$, where $r$ is the distance and $k$ is a constant. If the gravitational potential at $r=r_0$ be $V_0$, then what is the expression for the gravitational potential $V$?

A ball is projected horizontally with a speed $v$ from the top of a plane inclined at an angle ${45}^{\circ }$ with the horizontal. How far from the point of projection will the ball strike the plane?

Find the value of R in the given figure so that there is no current in the $10\Omega$ resistor.

Out of the two balls mark 25 Watt and 100 Watt which has higher resistance? Also explain your answer

A point object is placed at a distance $12\text{cm}$ from a convex lens of focal length $10\text{cm}$. On the other side of the lens, a convex mirror is placed at a distance of $10\text{cm}$ from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is

Two particles are projected simultaneously from the level ground as shown in the figure. They may collide after a time

The variation of translational kinetic energy of one mole of a monoatomic gas with temperature is shown in the graph. Find $\tan \theta$.

What is the potential difference across two points if $16\text{J}$ work is needed to move a $2\text{C}$ charge between them?

What will be the volume of $6.8\text{g}$ of $N{H}_3$ at standard temperature and pressure.

A position dependent force, $F=(7-2x+3x^2)\text{N}$ acts on a small body of mass $2\text{kg}$ and displaces it from $x=0$ to $x=5\text{m}$. The work done in joules is

A ship of mass $3\times {10}^{7}kg$ initially at rest is pulled by a force of $5\times {10}^{4}N$ through a distance of $3m$. Assume that the resistance due to water is negligible. The speed of the ship is

The specific resistance of a wire is $\rho$, its volume is $3{\text{m}}^3$ and its resistance is $3\Omega$, then its length will be

Two blocks of mass $M_1=20\text{kg}$ and $M_2=12\text{kg}$ are connected by a metal rod of mass $8\text{kg}$. The system is pulled vertically up by applying a force of $480\text{N}$ as shown. The tension at the mid-point of the rod is:

Strips of two metals A and B are firmly jointed together as shown in the figure.
On heating, A expands more than B does. If this jointed strip is heated, then it will appear as

A pump is required to lift $800\text{kg}$ of water per minute from a $10\text{m}$ deep well and eject it with speed of $20\text{m/s}$. The power required (in watts) of the pump will be

(Take $g=10m/s^2$)

The harmonic wave $y_i=(2.0\times {10}^{-3})cos\pi (2.0x-50t)$ travels along a string toward a boundary at $x=0$ with a second string. The wave speed on the second string is $50m/s$. What are the expressions for reflected and transmitted waves. Assume SI units

Calculate the moment of Inertia of an annular disc of inner radius $R_1$ and outer radius $R_2$ about an axis perpendicular to the plane in which the disc lies and passing through O.

When the switch is closed, then the initial current through $1\Omega$ resistor is

A glass spherical shell of center O with an outer radius ‘R’ and inner radius ‘r’ has refractive index ${\mu }_2$, the inside of the shell is filled with a material whose refractive index is ${\mu }_1$ as shown in figure (i). A source of light S is placed at a distance ‘a’ from the center as shown. If a ray of light starting at S gets double refracted into the surrounding as shown in (ii) with ${\beta }_2={90}^{\circ }$. Dotted lines represent normals at the points of refraction.
Choose the correct option/s.
(i)
(ii)

A body slides on a frictionless surfaces $A$ to $B$ of the velocity of ball at $A$ is $5\text{m/s}$. Its velocity at $B$ is $(g=10{\text{m/s}}^2)$

A block of mass $M=5\text{kg}$ is moving on a horizontal plane. An object of mass $m=1\text{kg}$ is dropped on to the block hitting it with a vertical velocity of $v_1=10\text{m/s}.$ The speed of the block at the same instant is $v_2=2\text{m/s}$ along the floor. The collision is momentary and the object sticks to the block upon collision. What will be the speed of the block just after the collision if the co-efficient of friction between the block and the horizontal plane is $\mathrm{0.4.}$

A roller coaster of mass $2000\text{kg}$ has a speed of $v_1=10\text{m/s}$ as it goes over the top of a $15\text{m}$ high hill. Then it goes over another hill of height $10\text{m}$ and at the crest of that hill, the roller coaster is moving with speed $v_2=13\text{m/s}$. How much is the work done by friction on the roller coaster during its movement between the hills ? Take $g=10{\text{m/s}}^2$.

Assuming that the op-amp in the circuit shown is ideal,



The output voltage $V_0$ is

A particle is moving along a circle of radius $1\text{m}$ with an angular speed $\omega =2t^2+5$, the tangential acceleration of the particle after $2\text{seconds}$ is

In YDSE, the light source is red light of wavelength 700 nm. When a thin glass plate of refractive index 1.5 is placed in front of one of the slits then the central bright fringe shifts by ${10}^{-3}$ cm, the position previously occupied by the 5th bright fringe. Find the thickness of the plate in micrometers.___

Following figure shows a network of capacitors where the numbers indicate capacitance in $\mu F.$ The equivalent capacitance between points A and B is

A bullet of mass $m_2$ is fired from a gun of mass $m_1$ with horizontal velocity $v$. A plane mirror is fixed to the gun facing towards the bullet. The velocity of the image of the bullet with respect to a frame fixed to ground is:

The figure shows a smooth pair of thick metallic rails connected across a battery of emf $\epsilon$ having a negligible internal resistance. A wire $ab$ of length $l$ and resistance $r$ can slide smoothly on the rails. The entire system lies in a horizontal plane and is immersed in a uniform vertical magnetic field $B$. At any instant, the wire is given a small velocity $v$ towards the right. Find the current in the arrangement at this instant.

A force $\overrightarrow{F}=2x{y}^2\hat{i}+2x^{2}y\hat{j}$ acts on a particle. The particle starts from point $(1,2)$ and moves to the point $(3,4)$. The total work done by the force $\overrightarrow{F}$ on the particle is

A butterfly is flying with a velocity $4\sqrt{2}\text{m/s}$ in North-East direction. Wind is slowly blowing at $1\text{m/s}$ from North to South. The resultant displacement of the butterfly in $3$ seconds is :

A ring has radius $R$ and mass $m_1=m\text{kg}$ which is distributed uniformly over its circumference. A highly dense particle of mass, $m_2=2m\text{kg}$ is placed at rest on the axis of the ring at a distance $x_0=\sqrt{3}R$ from the centre. Neglecting all other forces, except mutual gravitational interaction between the ring and particle. Calculate the speed of the ring at the instant when the particle is at the centre of the ring.

An inductor of inductance $100\text{mH}$ is connected in series with a resistance, a variable capacitance and an $\text{AC}$ source of frequency $2.0\text{kHz}$. What should be the value of the capacitance so that maximum current may be drawn into the circuit ?