Explore topic-wise InterviewSolutions in Current Affairs.

An object is dropped from a height of $5m$ and it takes $5s$ to reach the ground. Calculate the acceleration due to gravity at that place.

A body is moving with an initial velocity of $u$ and having constant acceleration $a$. The final velocity $v$ can be obtained by using which of the following equation of motion if a body covers a distance $s$.

A fish is swimming in a river at a depth of 20 cm from the surface of the water. Refractive Index of water is $\frac{4}{3}$. At what depth will an eagle flying above the water and exactly above the fish will see the fish?

Sneha has to lift a load of mass 50 kg to a height 1 m. She can exert a maximum effort of 250 N, so she uses an inclined plane to lift the load up. What should be the minimum length of the plank used by her? (take g = 10 N/kg)

In a semiconductor diode, p- side is earthed and to n-side is applied a potential of -2V: the diode shall

Match the column if deviation in the column-II is the magnitude of total deviation (between incident ray and finally refracted or reflected ray) to lie between $0^{\circ }$ and ${180}^{\circ }$. Here $n$ represents refractive index of medium.

Column-I	Column -II
	(p) deviation in the light ray is greater than ${90}^{\circ }$
	(q) deviation in the light ray is less than ${90}^{\circ }$
	(r) deviation in the light ray is equal to ${90}^{\circ }$
	(s) Speed of finally reflected or refracted light is same as speed of incident light.

A string is stretched between fixed points separated by $75.0cm$. It is observed to have resonant frequencies of $420Hz$ and $315Hz$. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is

A plane mirror is placed at the bottom of the tank containing a liquid of refractive index $\mu$ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be:

When an object of height 1 cm is kept at a distance of 4 cm from a concave mirror, its upright image of height 1.5 cm is formed at a distance of 6 cm behind the mirror. Calculate the focal length of the mirror ___

The expression for the magnification of a spherical mirror in terms of focal length (f) and the distance of object from the mirror(u) is what?

What is the nature of a lens whose power is, - 4 D ?

An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?

Principle of solar cooking

A plane mirror as placed at the bottom of a tank containing a liquid of refractive index, μ. P is a small object at a height h above the mirror. An observer, O vertically above P and outside the liquid P and find its image in a mirror. The apparent distance between these two will be

A bird in air looks at a fish below it inside in a transparent liquid in a tank. If the distance of the fish as estimated by the bird is $h_1$ and that of the bird as estimated by the fish is $h_2$, then the refractive index of the liquid is

In a spontaneous nuclear reaction

In a reactor, $2\text{kg}$ of ${}_{92}{\text{U}}^{235}$ fuel is fully used up in $30\text{days}$. The energy released per fission is $200\text{MeV}$. Given that the Avogadro number, $N=6.023\times {10}^{26}$$\text{per kilo mole}$ and $1\text{eV}=1.6\times {10}^{–19}\text{J}$. The power output of the reactor is close to:

The three main parts of a hot cathode ray tube are

Ram is pumping 100 metallic charged spheres one by one in a tube whose ends are maintained at a potential difference of 10 V. The work done in pumping these spheres is 50 J. Find the charge on each sphere.

1. 5.06

What is the orgin of gravity?

Is it the warping of the fabric of space time or is it due to particles called gravitons?

What is the Rayleigh scattering?

An object is placed at a distance 40 cm from a thin converging lens of focal length 10cm. Calculate the image distance.

A resistor of $16\Omega$ is cut into 4 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is:

Find the equivalent resistance between points $\text{A}$ and $\text{B}$.

During β decay of stationary nucleus, an electron is observed with a KE of 1.0 MeV. From this what can be concluded about Q value of the decay?

Difference between real and virtual image

Consider a hollow cylinder of inner radius a and outer radius 2a, lateral surface of cylinder is insulated and there is a temperature difference of $\Delta T$ between its ends, and $E_0$ is the rate of energy flow then we have (k : Thermal conductivity of material)

A person wears glasses of power $-2.5\text{D}$. What is the far point of this person, without the glasses?

You take two resistors of resistance 2 R and 3R and connect them in parallel in an electric circuit. Calculate the ratio of electric power consumed by 2 R and 3R.

State one advantage of using the main switch in house wiring.