Explore topic-wise InterviewSolutions in Current Affairs.

Can the visible light be scattered by atoms/ molecules in earth's atmosphere?

An isotope of Uranium is given as ${}_{92}{X}^{235}$. Which of the following option/s is/are correct?

To which wire is the metallic case of an electric appliance connected? Give the reason.

The lens shown in the figure is made of two different materials. A point object is placed on the principal axis of this lens. How many images will be obtained?

A bean of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered (a) the least, (b) the most.

An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What results do you expect? Explain.

A plane mirror is approaching you at 10 cm $s^{-1}$. Your image shall approach you with a speed of __.

Prism angle and refractive index respectively for a prism are ${60}^{\circ }$ and 1.414. Angle of minimum deviation will be

Which of the following represents specific heat in the mathematical form.

A football player kicks a cricket ball, which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows down to stop because

The speed of nerve impulse is about ___ times slower than speed of electricity.

An electrc bulb of resistance $20\Omega$ and a a resistance wire of $4\Omega$ are connected in series with a 6 V battery.
(a) total resistance of the circuit.
(b) current through the circuit.
(c) potential difference across the electric bulb.
(d) potential difference across the resistance wire.

An object is placed in front of a lens between centre and the focus and forms a virtual, erect and diminished image. Name the lens which forms this image.

Name two effects produced by electric current.

Find the amount of heat in calories required to convert 10g of ice at –10°C to water at 10°C

[C of ice = 0.5 cal/g°C, C of water = 4.2J/g°C = 1 cal/g°C, L of ice = 80cal/g]

The correct relation between coefficient of linear expansion $\alpha$, coefficient of surface expansion $\beta$ and coefficient of volume expansion$\gamma$ is

Give any two ways in which energy conservation can be achieved?

______ consists of fast moving electrons.

AB is an object and A'B' is its image. Then, match the following with the object distance. f: focal length.

How does the resistance of a wire depend on its length? Give a reason for your answer.

For a given mass of water, heat required for conversion of different processes is listed below.
$Q_1:$ Amount of heat required for ice at $-10{}^{\circ }C$ to reach $0{}^{\circ }C$.
$Q_2:$ Amount of heat required to convert ice into water.
$Q_3:$ Amount of heat required for water to reach from $0{}^{\circ }C$ to $100{}^{\circ }C$.
$Q_4:$ Amount of heat required for water to vapourise.

Which of the following heat transfers would involve latent heat of fusion?

A 1 cm high object is placed at a distance of 32 cm from a concave mirror. The image is real, inverted and 1.5 cm in size. Calculate the focal length of the mirror and the position of the image.

A ball is moving over a horizontal smooth surface with a constant velocity. What type of forces is acting on the ball?

Define resistor and insulator and factors of resistance

Two wires A and B of same matel have the same area of cross section and have their lengths in the ratio 2:1. What will be the ratio of currents flowing through them, when the same pottential difference is applied across length of each of them ....??

A block of mass 250kg falling at the rate of 10m in 5s is used to lift a load of 5000N by 2m in the same time. Calculate i) WO ii) PO iii) WI and iv) energy dissipated

A prism used in a Binocular to invert image. In such a case:

The change in magnetic flux due to the flow of an AC in a solenoid will generate a back emf in the same solenoid in a direction opposite to that applied to it. Name this phenomenon.

Twinkling of stars is due to _____.

Which of the following is the correct explanation for the arrangement of charges in the diagram shown below?

An electrical heater is rated 4 kW, 220 V. What is the cost of using this heater for 12 hours, if one kWh of electrical energy costs Rs. 3.25 ?

Nuclear energy can be termed in both renewable and non renewable resources.Why?

A pin 3 cm long is placed at a distance of 24 cm from a convex lens of focal length 18 cm. The pin is placed perpendicular to the principal axis. Find the position, size and nature of the image.

A d.c generator is based on the principle of :

(a) electrochemical induction (b) electromagnetic induction

(c) magnetic effect of current (d) heating effect of current

The force experienced by a current-carrying conductor placed in a magnetic is the largest when the angle between the conductor and the magnetic field is:

(a) ${45}^o$ (b) ${60}^o$ (c) ${90}^o$ (d) ${180}^o$

A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statement is not corrent ?

(a) The fuse should be fitted in the live wire

(b) A 13 A fuse is the most appropriate value to use

(c) The neutral wire is coloured black

(d) The green wire should be connected to the earth pin.

How should the electric lamps in a building be connected so that the switching on and off in a room has no effect on other lamps in the same building ?

The figure given below shows three resistors:
Their combined resistance is :

$\left(a\right)1\frac{5}{7}\Omega \left(b\right)14\Omega \left(c\right)6\frac{2}{3}\Omega \left(d\right)7\frac{1}{2}$

To which of the three connecting wires in a household circuit should the switch be connected?

The image can not be seen distinctly because eye lens become milky and cloudy. This condition is known as

Trace the correct path of the light ray after passing through the concave lens.