Page 1 - Competency Based Worksheet- Water, A Life Giving Liquid

SAI INTERNATIONAL SCHOOL

Class 7

Competency Based Worksheet

Subject- Physics
Ch. - Water: A life giving liquid

For Assertion& Reason question follow the following directions.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion
(c) If Assertion is correct but Reason is incorrect
(d) If Assertion is incorrect but Reason is correct
(e) If Assertion & Reason both are incorrect

1. Assertion (A): Water helps regulate the temperature of the human body.
Reason (R): Water evaporates from the skin in the form of sweat, carrying heat away
from the body.

2. Assertion (A): Water exists only in liquid form on Earth.
Reason (R): The temperature on Earth always remains constant.

3. Which of the following is not a source of freshwater?
(a) Rain
(b) Rivers
(c) Oceans
(d) Glaciers

4. What is the process called when water changes into vapour due to heat?
(a) Condensation
(b) Freezing
(c) Evaporation
(d) Precipitation

5. Which of the following practices helps in conserving water?
(a) Keeping taps open while brushing
(b) Watering plants during noon
(c) Fixing leaking pipes
(d) Using drinking water to wash vehicles

6. Which property of water makes it a universal solvent?
(a) It is colourless
(b) It is tasteless
(c) It can dissolve many substances
(d) It has high boiling point