Question

3.True and false; (1x10=10)

a)Base turn blue litmus red.

B )Sulphuric acid is present in the stomach.

c)If soil is too acidic, quicklime is added to it.

d)Sheep feed on mulberry leaves.

e)Wool is obtained only from sheep.

f)In an adult human, the total number of incisors are four.

g)Food pipe is also called alimentary canal.

h)Cutting of wood is a physical change.

i)During a physical change, new substances are formed.

j)Rusting of iron can be prevented by wrapping iron articles in paper.​

Answer 1

Explanation:

3.True and false; (1x10=10)

a) Base turn blue litmus red.

B )Sulphuric acid is present in the stomach.

c)If soil is too acidic, quicklime is added to it.

d)Sheep feed on mulberry leaves.

e)Wool is obtained only from sheep.

f)In an adult human, the total number of incisors are four.

g)Food pipe is also called alimentary canal.

h)Cutting of wood is a physical change.

i)During a physical change, new substances are formed.

j)Rusting of iron can be prevented by wrapping iron articles in paper.

1. true
2. false
3. true
4. false
5. false
6. true
7. true
8. false
9. false
10. false

Answer 2

Answer:

a) false

b) false

c) true

d) false

e) false

f) false

g) false

h) true

i) Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances

j) false