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Science [1 Marks Each] QUE - ANS

Changes Around Us · Gujarat Board (GSEB) STD 6 (GSEB - English Medium). 19 questions.

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[1 Marks Each] QUE - ANS

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19 questions · timed · auto-graded

Question 11 Mark
List four changes that take place in our body.
Answer
The following changes take place in our body: $(1)$ Growth of nails $(2)$ Growth of hair $(3)$ Increase in height $(4)$ Growing old
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Question 21 Mark
List four changes that takes place when an object is heated.
Answer
The changes that take place on heating are: $(1)$ Heating of iron $(2)$ Burning of a candle $(3)$ Transformation of water into vapour $(4)$ Roasting of roti
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Question 31 Mark
Give an example of a change that takes place when some other substance is mixed with the given substance.
Answer
Curdling of milk is the example of a change that takes place when a small amount of curd is mixed in milk.
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Question 41 Mark
Give an example of a reversible change that takes place when an object is heated.
Answer
The expanding of iron when heated is a reversible change. On heating iron expands.
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Question 51 Mark
Why is the curdling of milk known as an irreversible change?
Answer
Milk can easily be transformed into curd but curd cannot be transformed back into milk, hence, curdling of milk is known as an irreversible change.
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Question 61 Mark
Is the growth of a plant reversible or an irreversible change?
Answer
The growth of a plant is an irreversible change.
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Question 71 Mark
Are all the physical changes reversible?
Answer
No. Breaking of glass is a physical change. Yet it is an irreversible change.
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Question 81 Mark
Why is melting of wax known as a reversible change?
Answer
When wax is heated it melts and becomes liquid. On cooling it turns to solid again. Hence, melting of wax is a reversible change.
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Question 91 Mark
Why is burning of a paper an irreversible change?
Answer
Paper can be burnt into ashes, but ashes cannot be converted into paper again. Hence, burning of a paper is an irreversible change.
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Question 101 Mark
Wheat can be grounded into flour but flour cannot be turned into wheat again. Grounding of wheat into flour is what type of change?
Answer
Grounding of wheat into flour is an irreversible change.
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Question 111 Mark
After which type of change the object can be brought back to its original form?
Answer
After reversible change the object can be brought back to its original form.
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Question 121 Mark
Is the melting of ice a reversible change or an irreversible change?
Answer
The melting of ice is a reversible change.
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Question 131 Mark
What do you obtain when water vapour is cooled?
Answer
On cooling water vapour, it gets converted into water.
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Question 151 Mark
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred In the cement, could be reversed?
Answer
No, the change which has occurred in the cement cannot be reversed. Reason : As soon as water is added to cement, a chemical reaction starts as a result of which cement becomes as hard as stone. This change is the chemical change. Hence, it cannot be reversed.
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Question 161 Mark
A thick coating of a paste of Plaster of Paris $(POP)$ is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in $POP$ be reversed$?$
Answer
No, the change in Plaster of Paris cannot be reversed by simple physical method. Reason: $POP$ reacts with water and forms a new hard compound. This change cannot be reversed because it is a chemical change.
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Question 171 Mark
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer
If the picture is drawn with a pencil, then it can be erased and the drawing sheet comes to its original form again hence change can be reversed. But if the picture is drawn with colours it cannot be erased and the change cannot be reversed.
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Question 181 Mark
You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
Answer
No, this change cannot be reversed. Reason : A broken toy cannot be brought back into its original state.
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Question 191 Mark
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer
Yes, this change can be reversed. Reason: The folded clothes can be brought in original state by unfolding it.
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[1 Marks Each] QUE - ANS - Science STD 6 Questions - Vidyadip