Question

1. Solve these:
a) 1 Hour_________Second.
b)10Km__________metre
C)What is the relation between speed, distance and time.
2.When the current is switched on through a wire, a compass needle kept nearby gats deflected from its north-south position. Explain.
3. a) Write the two types of lenses.
b) Where are they used?
4. Explain the factors responsible for the depletion of water table. (Any two)
5. Draw the ray diagram to show the balance of oxygen and carbon dioxide.
(OR)
Why should oils and fats be not released in the drain? Explain.
6. Explain the relationship between sanitation and disease.​

Answer 1

Answer:

1a ,=60

1b=10000 n

speed=distance/time taken

convex lens concave lens

they used in correction of hypermetropia nd myopia

factors

overuse of water

construct iron of dams

Answer 2

Answer:

• 1.a 3600 s
• b 10000 m
• c.

Explanation:

• the length of path coverage by an object ring its motion is called distance .

interval at the speed with that the distance covered .

• the distance covered by an object in unit time is called speed .