Reflection of Light — Science STD 9 — Question

What are the modes of infection and preventive measures for Hepatitis?

Current – b. Increases the resistance in the circuit

What is the inter-relationship between the two questions (7 and 8) above?

Describe the positions of the source of light with respect to a concave mirror in
1. Torch light
2. Projector lamp
3. Floodlight

How are the frequencies of notes sa, re, ga, ma, pa, dha, ni related to each other?

Define :

Dilute solution

Which are the three kinds of salts depending on their pH value? How are they formed?

At least a small quantity of garbage or waste is produced every day in each house. What will happen if you keep this garbage for many days in your house?

An object moves 18 m in the first 3 s, 22 m in the next 3 s and 14 m in the last 3 s. What is its average speed? (Ans: 6 m/s)

Name the hormones of the following endocrine glands and the function of each :

Ovary