SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions

The ______ is an optical device with a polished surface that reflects the light falling on it.

Curved mirrors form the perfect image of an object.

Curved mirrors produce images that are either enlarged or diminished.

A thin layer of molten aluminium or silver is used for coating glass plates that will then become mirrors.

Assertion: The mirrors used in searchlights are parabolic and not concave spherical.
Reason: In a concave spherical mirror the image formed is always virtual.

If two mirrors are placed at an inclination of 30° then how many images can be seen?

Car rearview mirrors carry a warning message that “objects in the rearview mirror are closer than they appear”. Why do you think this is so?

In ice cubes, the force of attraction between the water molecules is ______.

When we heat them the force of attraction between the molecules decreases and the ice cubes become ______.

______ is the only matter on the Earth that can be found naturally in all three states.

Match the following

Mention the factors affecting the flow of heat.

______ is produced when an object is set to vibrate.

The substance through which sound is transmitted is called ______.

Billions of galaxies from the ______.

On immersing an iron nail in CuSO₄ solution for a few minutes, you will observe ______.

The head of the matchstick contains ______ and ______.

The sides of the matchbox contain ______.

The term electrolysis was introduced by ______.

The head of a matchstick contains red phosphorous.