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Science [5 Marks Each] QUE-ANS

Changes Around Us · Gujarat Board (GSEB) STD 6 (GSEB - English Medium). 4 questions.

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[5 Marks Each] QUE-ANS

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4 questions · timed · auto-graded

Question 15 Marks
To show that the burning of a candle is an irreversible change.
Answer
Apparatus - Materials: Candle, matchbox, scale.
$(1)$ Take a small candle and measure its length with a scale.
$(2)$ Fix the candle at a suitable place and light it.
$(3)$ Let it burn for some time.
$(4)$ Now blow out the candle and measure its length again. Can the change in length of the candle be reversed? Observation : Wax is used when a candle is lit due to which the length of the candle goes on decreasing. Conclusion : The burning of a candle is an irreversible change.


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Question 25 Marks
To show that the process of rolling roti from wheat dough is a reversible change.
Answer
Apparatus - Materials : Wheat dough, rolling pin. Procedure:
$(1)$ Take some dough and make a small ball.
$(2)$ Try to roll out a roti.
$(3)$ Change its shape back into a ball of dough again. Observation: If dough balls are rolled properly we get roti and from the roti dough can be gained again. Conclusion: The process of rolling roti from wheat dough is a reversible change.


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Question 35 Marks
Show that making of a toy aeroplane by folding paper Is a reversible change.
Answer
Apparatus — Material : Piece of paper. Procedure:
$(1)$ Take a piece of paper.
$(2)$ Make a toy aeroplane by folding the paper as shown in figure.
$(3)$ Unfold the paper again.
$(4)$ Observe if you get the original paper again. Observation : If a piece of paper is folded in a particular manner an aeroplane is made and when it is unfolded, the original paper is obtained again. Conclusion: Making a toy aeroplane by folding paper is a reversible change.

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Question 45 Marks
Show that blowing of a balloon is a reversible change.
Answer
Apparatus — Material: Balloon.  Procedure:
$(1 )$ Take a balloon.
$(2)$ Blow air in it with mouth.
$(3)$ Observe the change in shape and size of the balloon.
$(4)$ Let the air escape from the balloon. Note down your observation. Observation : As the air escapes, the balloon comes back to its original form.  Conclusion : Blowing of balloon is a reversible change.
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[5 Marks Each] QUE-ANS - Science STD 6 Questions - Vidyadip