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

Which of the following is transmitted through air?

The primary organ infected during tuberculosis is ______.

Vermicompost is a type of soil made by ______ and microorganisms.

Enumerate the advantages of vermicompost over chemical fertiliser.

What are the species of earthworm used for vermiculture?

What are the sources of organic resources for vermicomposting?

The incident angle of a ray of light is 30°. The angle between the incident ray and the reflected ray is ______.

The bouncing back of light from a surface is called ______.

Why do petroleum-based products float on the surface of the water?

Hydrometer is based on the principle of ______.

Where do we use lactometers?

Name different types of Hydrometers with their applications.

How do submarines sink and float in water?

Differentiate positive & negative buoyant.

Describe the purpose, principle, and working of the Lactometer.

Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.

Assertion (A): A bird perches on a high power line and nothing happens to the bird.
Reason (R): The level of the bird is very high from the ground.

Define the following:

Synaptic signals

Define the following:

Magnetic effect of current

For a plane mirror, magnification m = ______.