SSLC (English Medium) इयत्ता ९ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

The phenomenon of light passing through the object is called ______.

The resistance of a dry human body is high.

The bending of light as it passes from one medium to another is called ______.

A ray of light traveling in medium 1 strikes and travels into another transparent medium 2. If the speed of light is greater in medium 1, the ray will ______.

The ratio of the sine of the angle of incidence to the sine of ______ is constant.

Light is refracted or bent while going from one medium to another because of its ______ changes.

A star appears twinkling into the sky because of the reflection of light by the atmosphere.

Mirage is an example of refraction and the total internal reflection of light.

A water tank appears shallower when it is viewed from the top due to refraction. 

Twinkling of stars and Mirage are the two phenomena occurring due to refraction.

Assertion: The air bubble shines in water.
Reason: Air bubble shines due to the refraction of light.

Which is optically denser out of the two medium M₁& M₂ having the refractive indices = 1.71 and 1.36 respectively?

Under what circumstances there won’t be any refraction of light when it enters from one medium to another?

Why a pencil partly immersed in water appears to be bent at the water surface.

How do twinkling stars occur? (or) what is the cause of the twinkling of stars?

Match the following:

The depth of an ocean can be determined by ______.

Expand the abbreviation of the term SONAR.

A homogeneous mixture of two or more substances is called ______.

Why should gametes be produced by meiosis during sexual reproduction?