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

State whether true or false. If false, correct the statement.

In a step down transformer the number of turns in primary coil is greater than that of the number of turns in the secondary coil.

Differentiate step up and step down transformer.

A portable radio has a built in transformer so that it can work from the mains instead of batteries. Is this a step up or step down transformer? Give reason.

Explain two types of transformer.

The speed of light is maximum in ______.

What is the speed of light in vacuum?

Numerical problem.

Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Ans: 2 × 10⁸ ms^–1)

Higher Order Thinking Skills. 

Light ray emerges from water into air. Draw a ray diagram indicating the change in its path in water.

Higher Order Thinking Skill.

What do you conclude about the speed of light in diamond. if the refractive index of diamond is 2.41?

In petroleum refining, the method of separation used is ______.

The legal measures to prevent plastic pollution come under the ______ Protection Act 1988.

This type of food protect us from deficiency diseases. 

Name various food additives and explain their functions.

Hermaphrodite organisms are ______.

State whether true or false. If false, correct the statement.

Balanoglossus is a ciliary feeder.

Nerve cell does not contains ______.

Which one of the following substance is not a constituent of sweat?

Differentiate the following.

Excretion and Secretion

The physician who discovered that scurvy can be cured by ingestion of citrus fruits is ______.

Food should not be purchased beyond the date of ______.