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

Why does a ray of light bend when it travels from one medium to another?

Explain with diagrams how refraction of incident light takes place from

1. rarer to denser medium
2. denser to rarer medium
3. normal to the surface separating the two media.

Numerical problems.

The speed of light in water is 2.25 × 10⁸ ms^–1. If the speed of light in vacuum is 3 × 10⁸ ms^–1, calculate the refractive index of water.

How does the water kept in an earthen pot remain cool?

Explain how does SONAR work?

State the Gay Lussac’s law of combining volumes. Explain with an illustration.

Mention any two vital functions of human kidney

What is micturition?

Higher Order Thinking Skill

Why do you think that urine analysis is an important part of medical diagnosis?

AGMARK is used to certify ______ and ______ products in India.

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

ISI mark is mandatory to certify agricultural products.

Give abbreviation for the following.

ISI- 

Give abbreviation for the following.

FPO- 

Give abbreviation for the following.

AGMARK- 

Give abbreviation for the following.

FCI- 

Give abbreviation for the following.

FSSAI- 

Assertion: AGMARK is a quality control agency

Reason: ISI is a symbol of quality

Give reason for the following statement.

We should not eat food items beyond the expiry date

Explain the role of food control agencies in India.

Higher Order Thinking Skill.

Sanjana wants to buy a jam bottle in a grocery shop. What are the things she should observe on the label before purchasing it?