Changes Around Us | Chapter Assessment | English | Grade 6
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Science
6th Grade
NGSS covered
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Changes that cannot be reversed are called _____________ .
Irreversible changes
Reversible changes
Physical change
Chemical change
Answer explanation
Changes that cannot be reversed are called irreversible changes.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following change can not be reversed?
Melting of ice
Melting of wax
Melting of ghee
Melting of burning candle
Answer explanation
Melting of burning candle cannot be reversed. Melting of ice can be reversed by freezing it Wax is formed as soon as melted wax is cooled. So, it is reversible change. Melted ghee can be reversed after cooling it .
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following changes can be reversed?
Growth in height
Increase in weight
Blooming of flower
Burning of candle
Answer explanation
Increase in weight can be reversed. Growth in height, blooming of flower, burning of candle cannot be reversed.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A piece of metal is heated. Choose the incorrect statement for the given situation.
When cooled piece metal comes near to its original size
Piece of metal expands on heating
Piece of metal changes its shapes permanently and cannot be reversed
Heating a piece of metal is a reversible change.
Answer explanation
The incorrect statement is - Piece of metal changes its shapes permanently and cannot be reversed. Metal piece expands on heating and contracts when cooled, so it comes nearly to its original size. Therefore the process is reversible change.
Tags
NGSS.MS-PS1-4
NGSS.MS-PS3-4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rolling of paratha and baking of paratha are changes ______
that can be reversed
that cannot be reversed
in which rolling of paratha can be reversed and baking of paratha cannot be reversed
In which rolling of paratha cannot be reversed and baking of paratha can be reversed.
Answer explanation
Paratha when baked changes the property of the dough, therefore it is a irreversible change. A rolled paratha can be kneaded again to make a dough, therefore, it is a reversible change.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Identify the changes among the following, which cannot be reversed. (i) Boiling of egg (ii) Baking of bread (iii) Drying of cloth (iv) Making of biogas from cow dung
(i) (ii) (iv)
(i) (ii) (iii)
(ii) (iii) (iv)
(i) (iii) (iv)
Answer explanation
Boiling of egg, Baking of bread, making biogas from cow dung are all irreversible changes.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Choose the reversible changes among the following. (i) Conversion of ice to water (ii) Melting of ice cream (iii) Drying of wet shirt (iv) Formation of curd
(i) (ii) (iii) (iv)
(ii) (iii) (iv)
(i) (iii) (iv)
(i) (ii) (iii)
Answer explanation
(i) Conversion of ice to water - water when freezed again converts into ice. (ii) Melting of ice cream - melted icecream when freezed again turn into solid ice cream (iii) Drying of wet shirt - Shirt when put into water, becomes wet again (iv) Formation of curd - Curd cannot be turned again into milk. Therefore option 4 is correct answer.
Tags
NGSS.MS-PS1-4
NGSS.MS-PS3-4
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