Explore topic-wise InterviewSolutions in Current Affairs.

Two masses - ' $\sqrt{3}$m' and '$\sqrt{2}$m' are tied by a light string are placed on a wedge of mass '4m'. The wedge is placed on a smooth horizontal surface. Find out the value of $\theta$ such that the wedge does not move even after the system is set free from the state of rest.

Two wires A and B are made of copper. Both wires are 1m long. Wire A is 1mm thick and wire B is 2mm thick. Which wire has more resistivity.

What is wind energy? How is the wind energy used to produce electricity? How much electric power is generated in India using the wind energy?

What energy transformation takes place in power generation from wave energy?

The __ is a safety device used in case of overloading and short-circuits.

In a nuclear fission reaction, the mass of the original nucleus is:

How are winds formed?

Observe the following V-I graphs for two conductors at a particular temperature and choose the correct option accordingly

Which statement is true about natural gas?

In which of the following cases e.m.f. is induced?
(i) A current is started in a wire held near a loop of wire.

(ii) The current is switched off in a wire held near a loop of wire.

(iii) A magnet is moved through a loop of wire.

(iv) A loop of wire is held near a magnet.

The work done by the heart to beat one time is 1.2 J. If it beats 72 times in 1 minute, calculate the power of heart.

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

Orthogonal matrix among the following is

At what voltage and frequency is the electric power generated at the power generating station?

Name the region just beyond (i) the red end, and (ii) the violet end, of the spectrum.

In a house two 60 Watt bulbs are lighted for 4 hours, and three 100 watt bulbs for 5 hours everyday. calculate the electric energy consumed in 30 days.

plz tell me why 30 days will not be changed to hour

Don't solve fuul ans but tell me then why u hve answered in kwh

Concentric circles with arrows centred at the wire AB are shown in the figure. What is the direction of the current in the wire AB?

What is the minimum possible value of i) absolute refractive index & ii) relative refractive index of a medium.

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

A square plate of side 4 metre has uniform mass density and is hinged at the midpoint of one of its edge as shown in the figure. What will be the torque due to gravity on it about the hinged point A? (Mass of the plate = $20kg$; g = $10m{s}^2$)

The filament of a bulb takes a current 100 mA when the potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.

A substance initially in the solid state at $0^{\circ }C$ is heated. The graph showing the variation in temperature with the amount of heat supplied is shown below. If the mass of the substance is 20g, find the latent heat of fusion of the substance.

Correct set of four quantum numbers for valence electron of rubidium (Z = 37) is

The mirror used in the construction of shaving glass is

A particular colour in the rainbow makes an angle of ${42.7}^{\circ }$ with the line of vision. Identify the colour?

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same.

(a) mirror A is concave and mirror B is convex

(b) mirror A is plane and mirror B is concave

(c) mirror A is concave and mirror B is plane

(d) mirror A is convex and mirror B is concave

How can the current be same in resistance connected in series The current should decapitate in the form of heat while passing it and as it is a resistor it will reduce the current so why should we consider while deriving R_{eff=R1+R2...Rn in case of series connection}

Pure solid sulphur absorbs $2.7\text{kcal}$ of heat and becomes molten sulphur of mass $300\text{g}$. What is the specific latent heat of melting of sulphur in ${\text{J g}}^{-1}$?

A rocket is launched vertically from the surface of a planet with radius $R$. Rocket has an initial speed $v$. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by________.
Take $g=\frac{GM}{R^2}$.

Which of the following example shows, an object that does not change its magnitude of velocity but only its direction of motion?

The red colour of the sun at the time of sunrise and sunset is because red colour is ___ scattered.

Ahars, Kattas, Bhundhis and Khadins are the modes of:
(a) grain storage
(b) soil conservation
(c) water harvesting
(d) cold storage

Suppose a planet is revolving around the sun in a elliptical orbit at any instant of time it is at distance r with a speed v and f is the gravitational force between the sun and the planet. Choose the incorrect relationship among the following . (1) f~1\r^2 (2) f~v^2\r (3) v^2~1\r. (4) v^2~1\r^2

What is the colour of sunlight when it is scattered by the dust particles?

A toy train of mass $1kg$ moves with a constant velocity of $8m/s$ when connected to a battery of $8V$. Find the current in the circuit if the battery was connected for $4s$. Assume no energy loss due to friction.

The main function of ozone in atmosphere is to

A beam of light travelling in a rectangular glass slab emerges into air. Draw a ray-diagram indicating the change in its path.

Winds are caused by

A 5 g piece of ice at $-{20}^{\circ }$C is put into 10 g of water at ${30}^{\circ }$C. Assuming that heat is exchanged only between the ice and the water. Then find the heat required for phase change. Specific heat capacity of ice $=2100Jk{g}^{-1}{}^{\circ }{C}^{-1}$. Specific heat capacity of water $=4200Jk{g}^{-1}{}^{\circ }{C}^{-1}$ and latent heat of fusion of ice $3.36\times {10}^{5}Jk{g}^{-1}$.

What mass of $U^{235}$ is consumed per hour (approximately) in a nuclear reactor releasing 1 kW of fission power. (Energy released in one fission is 200 MeV)