Explore topic-wise InterviewSolutions in Current Affairs.

Which of the electromagnetic rays produce a high heating effect?

An $870kg$ car skids to a stop across a horizontal surface over a distance of $45m$. The frictional force acting on the car is $7000N$. What is the initial velocity of the car?

In an experiment, the saturation in the plate current in a diode is observed at 240V. But a student still wants to increase the plate current. It can be done, if

Write the unit of Electrical resistivity.

The following figure shows the elliptical path of a planet around the sun at point $O$. $AOB$ and $COD$ have equal areas. Suppose $t_1$ and $t_2$ be the time taken by the planet to go from $A$ to $B$ and from $D$ to $C$ respectively. Choose the correct option.​​​​​​​

Which of the following radiations has a wavelength longer than that of visible light?

Why is management of vegetation and wildlife a challenge? Give 2 reasons

How electron flow causes electric current with drude and Lorentz theory of electrons

We know the difference between current and voltage, when we join resistors in series and parallel in any circuit but what happens when we join a set of cells or battery in series or parallel in an electric circuit. What changes come in flow of electricity, current and voltage in these condition.

The diagram below shows three different modes of vibration P, Q and R of the same string of a givens length.

(a) Which vibration will produce a louder sound and why?

(b) Which vibration will produce sound of maximum shrillness (of pitch) and why ?

(c) What is the ratio of wavelength of vibrations P and R ?

Name the device used to transform 12 V a.c. to 200 V a.c. Name the principle on which it works.

Name the subjective property of sound related to its frequency.

In 10 seconds a charge of 25 coulomb leaves a battery and 200 joules of energy are delivered to an outside circuit as a result.what is the potential difference across the battery?

Complete the following nuclear equations by filling in the correct values in the blanks.

In a statement of Fleming's left-hand rule, what do the following represent ?

(a) direction of centre finger.

(b) direction of forefinger.

(c) direction of thumb.

How do we see objects?

A uniform metre scale can be balanced at the 70.0 cm mark when a mass of 0.05 kg is hung from the 94.0 cm mark. Find the mass of the metre scale.

In Fleming’s right-hand rule:

10cm tall image is projected on a screen 50cm away from the convex lens of focal length 20cm. Find the position and size of the object.

A concave lens of 20 cm focal length forms an image 15 cm from the lens. Compute the object distance.

Where is the object placed in reference to the prinicipal focus of a magnifying glass, so as to see its enlarged image? Where is the image obtained?

When an object is at infinity from a concave mirror, the image formed is

Give two uses of concave mirrors. Explain why you would choose concave mirrors for these uses.

An object is placed (a) 20 cm, (b) 4 cm, in front of a concave mirror of focal length 12 cm. Find the nature and position of the image formed in each case.

When does a body rotate ? State one way to change the direction of rotation of the body. Give a suitable example to explain your answer.

Which of these types of mirrors are used as rear view mirrors?

Which of the following terms is not a part of the 3 $R^{{}^{\prime }}$s for nature conservation?

Which of the following combination of terms has no fossil fuel?
(a) wind, ocean, coke
(b) kerosene, tide, wind
(c) wood, wind, sun
(d) petrol, wood, sun

Choose the correct ray diagram when a light falls normally on a surface separating two different media:

The relationship between the SI and CGS unit of work.

State and define the S.I. unit of resistance.

What is the subjective property of sound related to its Intensity

Complete the following table :

$\begin{array}{cccc}\text{Type of}& \text{Position of}& \text{Nature of}& \text{Size of}\\ \text{lens}& \text{object}& \text{image}& \text{image}\\ \text{Convex}& \text{Between optical}& & \\ & \text{centre and focus}& & \\ \text{Convex}& \text{At focus}& & \\ \text{Convex}& \text{At infinity}& & \\ \text{Convex}& \text{At any distance}& & \end{array}$

Which of the following are contact forces?

What is the most important factor under consideration for the site selection of a thermal power plant?

Which of the following represents the correct order of energy change in Hydroelectric power stations?

Define the term specific heat capacity and state its S.I.unit.

The refractive index of a piece of transparent quartz is the greatest for

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.