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Science Answer The Following Questions In Short.[2 Marks Each]

Changes Around Us · Gujarat Board (GSEB) STD 6 (GSEB - English Medium). 7 questions.

Questions

Answer The Following Questions In Short.[2 Marks Each]

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7 questions · timed · auto-graded

Question 12 Marks
Classify the following changes into reversible and irreversible: Ripening of a mango, compressing a spring, burning of wood, souring of milk, melting of ice cream, blowing a balloon, glowing of a bulb, burning of coal, growing old, heating of tar, cooking dal from pigeon pea g rains dissolving alum in water.
Answer
Reversible chanres : Compressing a spring, Melting of ice cream, Blowing a balloon, Glowing of a bulb, Heating of tar, Dissolving alum in water Irreversible changes : Ripening of a mango, Burning of wood, Souring of milk, Burning of coal, Growing old, Cooking dal from pigeon pea grains
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Question 22 Marks
How is curd prepared from milk?
Answer
$(1)$ The milk is gently heated.
$(2)$ Small quantity of curd is added to warm milk.
$(3)$ The milk is stirred gently so that the curd gets mixed into the milk.
$(4)$ The mixture is then left to stand still at warm place for a few hours.
$(5)$ Curd is ready.
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Question 32 Marks
State all the changes that occur in wheat starting from its grain to becoming a chapati. Also categorise them into reversible and irreversible changes.
Answer
The changes that occur in wheat starting from its grain to becoming a chap att are:
$(1)$ Grinding of wheat grain into flour: Irreversible change
$(2)$ Preparing dough from flour : Reversible change
$(3)$ Breaking dough into small balls: Reversible change
$(4)$ Rolling of small balls into roti : Reversible change
$(5)$ Roasting of rolled roti : Irreversible change
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Question 42 Marks
How is a slightly smaller metal rim fitted on a wooden wheel of a bullock cart?
Answer
The metal rim which is fitted on a wooden wheel of a bullock cart is made slightly smaller than the wooden wheel. On heating, the rim expands and fits onto the wheel easily. Cold water is then poured over the rim, the ring contracts and becomes slightly smaller. Now, it fits tightly onto the wheel.
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Question 52 Marks
What do you mean by an irreversible change? Give two examples.
Answer
The change that cannot be reversed to obtain the substance in its original form by simple• physical method is called irreversible change.. Examples: $(1)$ Curdling of milk $(2)$ Frying of chips
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Question 62 Marks
What do you mean by a reversible change? Give two examples.
Answer
The change that can be reversed and the original form of the substance can be obtained again is called reversible change. Examples: $(1)$ Dissolving of salt in water $(2)$ Freezing of water
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Question 72 Marks
List the changes you see around you.
Answer
The changes seen around us are as follows: $(1)$ Phases of moon $(2)$ Rising and setting of sun $(3)$ Day and night $(4)$ Blooming of flowers on the plant $(5)$ Falling of leaves from the tree $(6)$ Cooling of hot water $(7)$ Growing of nails $(8)$ Breaking of a glass bottle
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Answer The Following Questions In Short.[2 Marks Each] - Science STD 6 Questions - Vidyadip