Page 176 - Volt Elevate The World Around Us Book 4

Practice Sheet 4

A. Choose the correct option.
1. Which of these is a natural source of water?
(a) Hand pump (b) River

(c) Tube well (d) Water tank
2. Which part of the day has shadows that are the longest?

(a) Noon (b) Early morning
(c) Evening (d) Both (b) and (c)
3. What is the main aim of rainwater harvesting?
(a) To clean water. (b) To store water.

(c) To make rain. (d) To sell water.
4. Which of the following phases of the moon comes after the new moon?

(a) Waxing crescent (b) Full moon
(c) Waning crescent (d) First quarter

B. Write True or False.

1. Water pollution can harm plants, animals and humans. _______________
2. Chandrayaan is India’s mission to explore the moon. _______________
3. It is safe to drink water directly from rivers or ponds
without cleaning it. _______________

4. Stars can only be seen in the daytime. _______________

C. Choose the correct answer for each of the following pairs of statements.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.

(d) A is false but R is true.
1. Assertion (A): Saving water is important.
Reason (R): Water is available in unlimited amounts.

2. Assertion (A): Shadows change their length during the day.
Reason (R): The Sun appears to move across the sky.

3. Assertion (A): We throw rotten food items in the blue dustbin.
Reason (R): Blue dustbin is for non-biodegradable waste.

D. Answer the following questions.

1. Name two ways in which we can keep water clean.
2. Explain the phases of the moon and how they change over a month.

166