Explore topic-wise InterviewSolutions in Current Affairs.

A ball is tossed up with an initial speed of $24\text{m/s}$. How high up will it go?

A man of mass $50\text{kg}$ jumps on a car from a tower as shown in the figure.

Find the final velocity of the car if the weight of the car is $150\text{kg}$ and is initially moving with a velocity of $60\text{m/s}$.

Ammeter connected in parallel to the circuit burns out why

In a satellite if the time of revolution is T, then kinetic energy is proportional to.

The volume of a metal sphere increased by $0.24$ % when its temperature is raised by ${40}^{\circ }C$. The coefficient of linear expansion of metal is

A steel wire $2\text{m}$ long is suspended from the ceiling. When a mass is hung at its lower end, the increase in length recorded is $1\text{cm}$. Determine the strain in the wire.

The number of sodium atoms in 2 moles of sodium ferrocyanide $\left(N{a}_4\right[Fe\left(CN{)}_6\right])$ is:
(Consider Avogadro's number = $6\times {10}^{23})$

An ideal monoatomic gas at temperature ${27}^{\circ }\text{C}$ and pressure ${10}^6{\text{N/m}}^2$ occupies $10\text{L}$ volume. $10,000\text{cal}$ of heat is added to the system without changing the volume. Calculate the change in temperature of the gas. Given:$R=8.31\text{J/mol-K}$ and $J=4.18\text{J/cal}$

A big drop of radius R is formed by 1000 small droplets of water, then the radius of small droplets of water,

A piston of a syringe pushes a liquid with a speed of 1 cm/sec. The radii of the syringe tube and the needle are R = 1cm and r = 0.5 mm respectively. The velocity of the liquid coming out of the needle is

Find the volumetric strain of the spherical ball of radius $10\text{cm}$ whose volume changes by $4.18\times {10}^{-6}{\text{m}}^3$ under the application of bulk stresses.

A block of mass m is placed on a smooth inclined wedge ABC of inclination $\theta$ as shown in the figure. The wedge is given an acceleration 'a' towards the right. The relation between a and $\theta$ for the block to remain stationary on the wedge is

I apply an electric field of ${10}^{5}N/C$ on a conductor of cross section $4m{m}^2$ and I get a current of 1A. If I want to change the current to 0.3A, what is the electric field I need to apply?

The density of a gas is 2 $\frac{g}{L}$ at 1 atm and ${27}^{0}C$. The density of the same gas at 2 atm and ${127}^{0}C$ is:

Water pours at the rate of $Q$ from a tap, into a cylindrical vessel of radius $r$. At an instant when the height of water is $h$, The rate at which water level rises is

The extension in a string, obeying Hook's law, is $x$. The speed of sound in the stretched string is $v$. If the extension in the string is increased to $1.5x$, the speed of sound will be :

Electric lines of force never intersect each other because

A player throws a ball upwards with an initial speed of $29.4m{s}^{-1}$.
(a) What is the direction of acceleration during the upward motion of the ball?
(b) What are the velocity and acceleration of the ball at the highest point of its motion?
(c) Choose the x = 0 m and t = 0 s to be the location and time of the ball at its highest point, vertically downward direction to be the positive direction of x-axis, and give the signs of position, velocity and acceleration of the ball during its upward, and downward motion.
(d) To what height does the ball rise and after how long does the ball return to the player’s hands? (Take g = $9.8m{s}^{-2}$ and neglect air resistance).

A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at 27ºC it weighs 30 gm. When the temperature of liquid is raised to 42ºC the metal piece weight 30.5 gm, specific gravity of the liquid at 42ºC is 1.20, then the linear expansion of the metal will be

The de-Broglie wavelength of a neutron at ${27}^{\circ }C$ is $\lambda$ . What will be its wavelength at ${927}^{\circ }C$

An object moves along the grid through the points A, B, C, D, E and F as shown in the figure. Find the magnitude of displacement covered by the moving object.

A wave is represented by the equation $y=y_{0}sin[10\pi x-15\pi t+\left(\frac{\pi }{3}\right)]$ where x is in metres and t in seconds. The equation represents a travelling wave:

A light ray travels in two media A and B will speeds $2\times {10}^{8}m/s$ and $2.4\times {10}^{8}m/s$. The critical angle between them is

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of $H{e}^{+}$ spectrum?

The kinetic energy possessed by a body of mass m moving with a velocity v is equal to $\frac{1}{2}m{v}^2$ , provided

What is the relationship between wavelength of light and the quantity of energy per photon?

A circular wire fo radius 'R' carries a current 'i'. What will be the magnetic field at its centre?

Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity

An object is displaced from point $A(0,0)m$ to a point $B(3,4)m$ under the influence of a force $\overrightarrow{F}=4\hat{i}-2\hat{j}.$ The workdone by this force is

A closed circular wire hung on a nail in a wall undergoes small oscillations of amplitude $2^0$ and time period 2 s. Find (a) the radius of the circular wire, (b) the speed of the particle farthest away from the point of suspension as it goes through its mean position, (c) the acceleration of this particle as it goes through its mean position and (d) the acceleration of this particle when it is at an extreme position. Take $g={\pi }^{2}m{s}^{-2.}$

What is the acceleration due to gravity on the top of mouint everest? Mount everest is the highest mountain peak of the world at the height of 8848 m. the value at sea level is $9.80m{s}^{-2}$

An insect crawls up a hemispherical surface very slowly (figure). The coefficient of friction between the insect and the surface is $\frac{1}{3}$. If the line joining the centre of hemispherical surface to the insect makes an angle $\alpha$ with the vertical, the maximum possible value of $\alpha$ is given by

A 20 $\mu F$ capacitor is joined to a battery of emf 6.0 V through a resistance of 100 $\Omega$. Find the charge on the capacitor 2.0 ms after the connections are made.

When radiation of wavelength Lambda is incident on a metal stopping potential is 10 volt when the wavelength is 2Lambda the stopping potential become 4V. threshold threshold wavelength of metals is

Figure represents a capacitor made of two circular plates each of radius $r=12\text{cm}$ and separated by $d=5.0\text{mm}$. The capacitor is being charged by an external source. The charging current is constant current, $I=0.15\text{A}$.

Find the displacement current across the plates.

It was stated in your video that earth is full of electrons . still when we touch a negatively charged body the electrons transfers from us to the earth but why the electrons already present in earth do not repel the coming electrons .

In a young's double slit experiment, the separation between the slits = 2.0 mm the wavelength of the light = 600 nm and the distance of the screen from the slits 2.0 m. If the intensity at the centre of the central maximum is 0.20 $W{m}^{-2}$ what will be the intensity at a point 0.5 cm away from this centre along the width of the fringes?

An alpha particle is projected vertically upward with a speed of $3.0\times {10}^4$ km $s^{-1}$ in a region where a magnetic field of magnitude 1.0 T exists in the direction south to north. Find the magnetic force that acts on the $\alpha -$ particle.

A wave motion has the function $y=a_o\sin (\omega t-kx)$. The graph in figure shows how the displacement $y$ at a fixed point varies with time $t$. Which one of the labelled points represents the same displacement as will be at the position $x=\frac{\pi }{2k}$ at time $t=0$?

A beaker contains 200 gm of water. The heat capacity of the beaker is equal to that of 20 gm of water. The
initial temperature of water in the beaker is ${20}^{\circ }C.$ If 440 gm of hot water at ${92}^{\circ }C$ is poured in it, the final
temperature (neglecting radiation loss) will be nearest to

The amount of heat required to convert $5\text{g}$ of ice at $0^{\circ }\text{C}$ to $5\text{g}$ of steam at ${100}^{\circ }\text{C}$ is -
[Latent heat of vaporization and fusion are $L_v=540{\text{cal g}}^{-1}$ and $L_f=80{\text{cal g}}^{-1}$]

A square plate of side 'a' is kept below an infinite line charge of charge per unit length $\lambda$ (as shown in figure). Electric flux associated with the plate is $\frac{3\lambda a}{n\pi {ϵ}_o}ta{n}^{-1}\left(\frac{1}{2}\right).$
Here, n is