Question

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Answer 1

1. Rusting of iron takes place due to moisture. in coastal areas moisture is more than the deserts so iron rusts faster in coastal areas.

2. melting of ice is physical change because the water formed after the melting of ice can be freezed again and made ice .

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2))

1. False

2. True

3. true

4. false

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3))

protiens - amino acids

digestion of food- chemical change

tearing of paper- physical change

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4))

1. saliva has salivary amylase which helps in break down of food.

4. Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.

Answer 2

Explanation:

1..

a..We know that for rusting, the presence of both oxygen and water (water vapour) is essential. Thus, in coastal areas, the air contains high moisture which means more humid environment and rusting becomes faster.

b..Melting of ice is a physical change because it involves change only in the physical state of water, from ice in the solid state to water in the liquid state. Moreover, no new chemical substance is formed in the process and this change is reversible. Water can be converted back into ice simply by freezing

c..A laboratory thermometer cannot be used to measure the human body temperature. This is because as soon as we take out the bulb of the laboratory thermometer from our mouth, the level of mercury in its tube will start falling quickly. This will give a wrong value of the body temperature.

d..The caecum is well developed in 'herbivorous' but not in man because a large tube like structure that receive undigested material from small intestine is called caecum. ... In small herbivorous such as goat and rabbit, caecum is enlarged and contain bacteria which helps in the digestion of plants and digest cellulose.

2

a..false

b..true

c..true

d..false