Page 152 - Science Class 06

B. Fill in the blanks.
1. ____________ is found in all the three physical states—solid, liquid and gas.

2. Small amount of water vapour is present in the ____________ .
3. The ____________ at which a solid melts is called the mel ng point of the solid.
4. ____________ is the process by which water changes from a liquid to a gas or vapour.

5. Warm air is less dense than cold air and hence rises ____________ .
C. Write True or False.
1. Heat is required for evapora on.
2. Cloud is a huge mass of water droplets or ice crystals.

3. The physical states of water are interchangeable.
4. The rate of evapora on becomes faster on a windy day.
5. A huge cloud may have posi ve as well as nega ve charge.

D. Very short answer ques ons.
1. What is evapora on?
2. What is condensa on?
3. How can you convert water into water vapour?

4. What is lightning?
E. Short answer ques ons.
1. How ice is converted into water?
2. What helps in the forma on of clouds?

3. Describe water cycle.
4. Describe a lightning conductor.
5. Differen ate between freezing point and mel ng point.
F. Long answer ques ons.

1. Explain the three states of water in a paragraph.
2. Explain the interchangeability of states.
3. Explain the forma on of clouds.

4. Describe thunder and lightning.

Project
Project
Project ActivityActivityActivity
Project Activity
Take the temperature of boiling water, ice and normal water and note it on a paper.
Try to know about the water harves ng plant and its importance.

HO
HO
HOTS TS TS
HOTS
A. Why do we find a reservoir of water near a dam?
B. What would have been the consequences if water was not recycled in nature by the water
cycle?

152 Science-6