SSLC (English Medium) Class 9 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

______ break down organic matter and animal waste into ammonia.

Name two common mosquitoes and the diseases they transmit.

The entire light is reflected back into the denser medium is called ______.

The outer concentric shell in optic fiber is called ______.

A bundle of glass threads, each of which is capable of transmitting messages using light waves is called ______.

Which of the following statements about total internal reflection is true?

The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur.

Optical Fibres are based on the phenomenon of dispersion.

The angle of incidence at which the angle of refraction is Q£ is called the critical angle.

What are the conditions to achieve total internal reflection?

What is a mirage? How does it occur?

What is the phenomenon used in optical fiber? Explain.

Write any two uses of total internal reflection.

What are the examples of total internal reflection in nature?

Excretion means ______.

Which is the major excretory product in humans?

Write a note on the skin.

The nasal spray vaccine can be administered to ______ patients.

Dengue is known as ______ fever.

Swine flu spreads through the air by an acute respiratory virus.