MEDIUM
6th Foundation
IMPORTANT
Earn 100

Swati classified a few changes occurring around us as shown in the table.

S.No. Changes Type
1. Sharpening of pencil Physical, reversible
2. Evaporation of water Physical, irreversible
3. Photosynthesis Chemical, irreversible
4. Rusting of iron Chemical, reversible

Which of the changes is/are classified correctly?

50% studentsanswered this correctly

Important Questions on Changes Around Us

MEDIUM
6th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 6>Chapter 4 - Changes Around Us>EXERCISES>Q 18
Read the given statements and mark the correct option.
Statement 1 : While fixing a metal rim on a wooden wheel of a cart, the size of the metal rim is kept slightly smaller than that of the wooden wheel.
Statement 2 : Metals expand on heating and contract on cooling.
HARD
6th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 6>Chapter 4 - Changes Around Us>EXERCISES>Q 19

Study the given Venn diagram
Question Image

Identify points 1, 2 and 3.

  1 2 3
(A) Melting of ice Boiling of rice Burning of a candle
(B) Burning of paper Rusting of iron Cutting of fruits
(C) Breaking of a glass Baking a cake Burning of LPG in kitchen
(D) Tearing of paper Evaporation of water Making lemonade
MEDIUM
6th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 6>Chapter 4 - Changes Around Us>EXERCISES>Q 20

Observe the given processes 1 and 2 carefully.
Question Image

Which of the following statements are correct?
I. Bubbles are formed in process 1 while no bubble formation takes place in process 2.
II. Process 1 is slow while process 2 is fast.
III. Process 1 occurs at 100°C only while process 2 can occur at any temperature.