06 science changes around us 01 Class 6 Notes | EduRev

Class 6 : 06 science changes around us 01 Class 6 Notes | EduRev

 Page 1


 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in   Page 51 of 167 
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 
CBSE Worksheet-18 
Class – VI Science (Changes Around us) 
 
1. Which of the following is a reversible change? 
a. Melting of ice 
b. Burning of matchstick 
c. Changing of milk into curd 
d. Germination of seed 
2. Chemical changes are 
a. Always reversible 
b. Always are irreversible 
c. Mostly irreversible 
d. Mostly reversible 
3. In chemical change 
a. Molecules of the substance do not change 
b. Molecules of a substance change 
c. Substance remain same 
d. Change is reversible 
4. Which of the following is an example of physical change? 
a. A bud turning into flower 
b. Rusting of iron 
c. Ripening of fruit 
d. Boiling of water 
5. Match the following 
Column A Column B 
a.  Milk changes to curd i. Slow change 
b. Temporary change ii. Irreversible change 
c. Change of season iii. Physical change 
d. Rusting of iron iv. Can be compressed easily 
e. Air v. Chemical change 
 
 
Page 2


 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in   Page 51 of 167 
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 
CBSE Worksheet-18 
Class – VI Science (Changes Around us) 
 
1. Which of the following is a reversible change? 
a. Melting of ice 
b. Burning of matchstick 
c. Changing of milk into curd 
d. Germination of seed 
2. Chemical changes are 
a. Always reversible 
b. Always are irreversible 
c. Mostly irreversible 
d. Mostly reversible 
3. In chemical change 
a. Molecules of the substance do not change 
b. Molecules of a substance change 
c. Substance remain same 
d. Change is reversible 
4. Which of the following is an example of physical change? 
a. A bud turning into flower 
b. Rusting of iron 
c. Ripening of fruit 
d. Boiling of water 
5. Match the following 
Column A Column B 
a.  Milk changes to curd i. Slow change 
b. Temporary change ii. Irreversible change 
c. Change of season iii. Physical change 
d. Rusting of iron iv. Can be compressed easily 
e. Air v. Chemical change 
 
 
 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in   Page 52 of 167 
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 
6. Fill in the blanks. 
a. Changes in which a new substance is formed are called -------------------. 
b. Rotation of a fan is a ----------------------- change. 
c. Dissolving salt in water is a ------------- change. 
d. Eruption of a volcano is ----------- change 
e. The glowing of a tube light is a ----------- change. 
7. What are reversible changes? Give two examples. 
8. What is sublimation? Write two examples of sublime substance? 
9. Write some characteristics of physical changes? 
10. Classify the following a reversible or irreversible change. 
a. Growth of plant. 
b. Ploughing of a field 
c. Melting of Wax 
d. Breaking of glass 
e. Pulling of rubber string 
f. Burning of paper. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in   Page 51 of 167 
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 
CBSE Worksheet-18 
Class – VI Science (Changes Around us) 
 
1. Which of the following is a reversible change? 
a. Melting of ice 
b. Burning of matchstick 
c. Changing of milk into curd 
d. Germination of seed 
2. Chemical changes are 
a. Always reversible 
b. Always are irreversible 
c. Mostly irreversible 
d. Mostly reversible 
3. In chemical change 
a. Molecules of the substance do not change 
b. Molecules of a substance change 
c. Substance remain same 
d. Change is reversible 
4. Which of the following is an example of physical change? 
a. A bud turning into flower 
b. Rusting of iron 
c. Ripening of fruit 
d. Boiling of water 
5. Match the following 
Column A Column B 
a.  Milk changes to curd i. Slow change 
b. Temporary change ii. Irreversible change 
c. Change of season iii. Physical change 
d. Rusting of iron iv. Can be compressed easily 
e. Air v. Chemical change 
 
 
 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in   Page 52 of 167 
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 
6. Fill in the blanks. 
a. Changes in which a new substance is formed are called -------------------. 
b. Rotation of a fan is a ----------------------- change. 
c. Dissolving salt in water is a ------------- change. 
d. Eruption of a volcano is ----------- change 
e. The glowing of a tube light is a ----------- change. 
7. What are reversible changes? Give two examples. 
8. What is sublimation? Write two examples of sublime substance? 
9. Write some characteristics of physical changes? 
10. Classify the following a reversible or irreversible change. 
a. Growth of plant. 
b. Ploughing of a field 
c. Melting of Wax 
d. Breaking of glass 
e. Pulling of rubber string 
f. Burning of paper. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in   Page 53 of 167 
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks 
Answer key 
1. a 
2. c 
3. b 
4. d 
5. (a) – (v), (b) – (iii), (c) – (i), (d) – (ii), (e) – (iv). 
6. (a) Chemical changes (b) physical change (c) reversible (d) undesirable (e) physical 
7. A change is reversible if the substance can be brought back to its original form. For 
example, water on cooling changes into ice. Ice on heating changes back into water. 
8. The process of changing solid into gases directly without changing into liquid is called 
sublimation. Camphor and naphthalene are example of sublime substance. On heating, 
they vaporize into gases. 
9. Characteristics of physical changes are: 
a. No new substance is formed during a physical change. 
b. The physical change is temporary. 
c. The changes can be reversed easily. 
d. The composition of the substance remains unchanged. 
10.  
Reversible changes Irreversible changes 
Ploughing of a field Growth of plant 
Melting of ice Breaking of glass 
Pulling of rubber string  
 
 
 
 
 
 
 
 
 
 
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