Changes Around Us

Samacheer Book Back Questions And Answers For Science Standard 6 Term 2 “Changes Around Us“

I. Choose the Correct Answer:
1. When ice melts to form water, change occurs in its _____.
(a) position
(b) colour
(c) state
(d) composition

2. Drying of wet clothes in air is an example of _____.
(a) Chemical change
(b) Undesirable change
(c) Irreversible change
(d) Physical change

3. Drying of wet clothes in air is an example of
(a) Chemical change
(b) Undesirable change
(c) Irreversible change
(d) Physical change

4. Out of the following an example of a desirable change ¡s
(a) Rusting
(b) Change of seasons
(c) Earthquake
(d) Flooding

5. Air pollution leading to Acid rain is a
(a) Reversible change
(b) Fast change
(c) Natural change
(d) Human made change

II. Fill in the blanks:
1. Magnet attracts iron needle. This is _____ change. (a reversible / an irreversible)
2. Boiling of egg results in _____ change. (a reversible / an irreversible)
3. Changes that are harmful to us are _____ .(desirable / undesirable)
4. Plants convert Carbon-di-oxide and water into starch. This is an example of _____ change. (natural / human made)
5. Bursting of fire crackers is a_____ (slow / fast) change whereas germination of seeds is a _____ change. (slow / fast)

III. True or False. If False, give the correct statement:
1. Growing of teeth in an infant is slow change.
2. Burning of match stick is a reversible change.
3. Change of New moon to Full moon is human made.
4. Digestion of food is a physical change.
5. In a solution of salt in water, water is the solute.

Answers:
1. True
2. False (It is an irreversible change)
3. False (It is a Natural change)
4. False (It is a Chemical change)
5. False (Water is the solvent)

IV. Analogy:
1. Curdling of milk: irreversible change:: Formation of clouds : _____ change
2. Photosynthesis: _____ change: burning of coal: Human – made change
3. Dissolving of glucose: reversible change:: Digestion of food: _____change
4. Cooking of food: desirable change:: decaying of food: _____ change
5. Burning of matchstick: _____ change:: Rotation of the Earth : Slow change

Answers:
1. Reversible
2. Natural
3. Irreversible
4. Undesirable
5. Fast

V. Circle the odd one out. Give reason for your choice:
1. Growth of a child, Blinking of eye, Rusting, Germination of a seed.
2. Glowing of a bulb, lighting of a Candle, breaking of a coffee mug, curdling of milk.
3. Rotting of an egg, condensation of water vapour, trimming of hair, Ripening of fruit.
4. Inflating a balloon, popping a balloon, fading of wall paint, burning of kerosene

Answers:
1. Blinking of eye is a fast change
2. Curdling of milk is a chemical change
3. Trimming of hair is a Man-made change
4. Burning of Kerosene is a Chemical change

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