(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

What are ultraviolet radiations?

Name three properties of ultraviolet radiations which are similar to visible light.

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm Calculate the velocity of the wave.

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling

What is meant by an echo?

A man is standing at a distance of 12 m from a cliff. Will he be able to hear a clear echo of his sound? Give a reason for your answer.

The wavelength of X-rays is 0.01 Å. Calculate its frequency. State the assumption made, if any.

How does the resistance of a wire depend on its radius? Explain your answer. 

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

The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.

Name three factors on which resistance of a given wire depends and state how is it affected by the factors stated by you.

Draw a I–V graph for a linear resistor. What does its slope represent? 

Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.

What is a fuse? 

A fuse is a short piece of wire of high ______ and of material of low ______.

A fuse wire is made of an alloy of ______ and ______. If the current in a circuit exceeds the current rating of the fuse wire, it ______.

A fuse is connected in ______ with the ______ wire.

Why is the fuse wire fitted in a porcelain casing?

How is a fuse put in an electric circuit?

Describe with the aid of a diagram some form of a fuse which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.