Question

1. what is meant by term latent?
2. explain with an example of water
a latent heat of fusion
b latent heat of vaporization
3. How is tyndall effect observed in the canopy of a dense forest?
4. What volume of ethyl alcohol and water must be mixed together to prepare 250 ml of 60% by volume of alcohol in water?
5. Write the chemical formula of sodium carbonate, ammonium chloride, Aluminium Sulphate ?
6. How many molecules are present in -
a. 9g of water?
b. 17g of NH3?
7. Write any two point difference between nuclear region of a bacterial cell and an animal cell ?
8. Why is endocytosis found only in animals?
9. Why does the skin of your finger shrink when you wash clothes for a long time?
10. Distinguish between scalar quantity and vector quantity?
11. A car travels a distance of 360 km in 5 hours. what is the speed in metre per second?
12. State the Law of Inertia?
13. A runner presses his feet before he starts his Run. Identify action and reaction in this situation .
14. State the relation between the momentum of a body and the force acting on it .
15. Why is Newton's first law of motion also called Law of Inertia?

Answer 1

f=dpdivided by dt 2. a body remains at rest unless it is not reacted by any force 3.