______ is not a chemical change.
- ADissolution of ammonia in water
- BDissolution of carbon-di-oxide in water
- CDissolution of oxygen in water
- ✓Melting of polar ice caps
Answer: D.
View full solution →Question types
T2 CH 3 Changes Around Us question types
111 questions across 8 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
111
Questions
8
Question groups
5
Question types
01
MCQ
15 Q→02Fill in the blanks.
23 Q→03Assertion & Reason
8 Q→04TRUE & FALSE
15 Q→05Answer In One word.
21 Q→06[ 2 Marks Questions ]
19 Q→07Match The Following
4 Q→08[3 Marks Question]
6 Q→Sample Questions
T2 CH 3 Changes Around Us questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
______ is an example of a periodic change.
- ✓Earthquake
- BFormation of rainbow in sky
- COccurrence of tides in seas
- DShowering of rain
Answer: A.
View full solution →The chemical change is ______.
- Awater to clouds
- Bgrowth of a tree
- ✓cow dung to bio-gas.
- Dice-cream to molten ice-cream.
Answer: C.
View full solution →______ of the following are endothermic changes.
- ✓Condensation and melting
- BCondensation and freezing
- CEvaporation and melting
- DEvaporation and freezing
Answer: A.
View full solution →When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
- ✓physical change
- Bchemical change
- Cendothermic change
- Dexothermic change
Answer: A.
View full solution →Forest fire: ______ change::Change in period in a school: periodic change
Wood to sawdust:______:: Wood to Ash: Chemical change
Physical Change: Boiling::Chemical Change: ______.
Respiration is a ______ change.
Spoiling of food is a ______ change.
Assertion: A drop of petrol when touched with finger gives a chill feeling.
Reason: The above phenomenon is an endothermic one.
Reason: The above phenomenon is an endothermic one.
- ABoth A and R are true and R is the correct explanation of A
- ✓Both A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true.
Answer: B.
View full solution →Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Reason: For the rust to form from iron, it must be exposed to air and water.
- ✓Both A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true
Answer: A.
View full solution →Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
- ABoth A and R are true and R is the correct explanation of A.
- ✓Both A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true.
Answer: B.
View full solution →Assertion: The process of conversion of liquid water to its vapours by heating the liquid is called boiling.
Reason: The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
Reason: The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
- ✓Both A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true.
Answer: A.
View full solution →Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Reason: A physical change is a reversible change.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- ✓A is false but R is true
Answer: D.
View full solution →Tarnishing of silver is an example of endothermic change.
If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.
A bean plant collecting sunlight and turning it into bean seeds is an example of physical and non-periodic change.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
Cutting of cloth is an example of a periodic change.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Growing of nails is a periodic change. Why?
Is solar eclipse a periodic change? Give your reason.
Can you suggest a method to collect water from sea water?
What type of energy changes is associated when ice melts?
Higher order Thinking question A very hot glass on putting in cold water cracks. What does this change indicate?
How can a change occur in a substance?
Distinguish physical and chemical changes.
Why is spoiling of food a chemical change?
Photosynthesis is a chemical charge. Justify your answer.
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
Observe the picture containing a kettle and note that it has salt water in it and answer the following questions:
Picture based question
Observe the picture and list down the changes that are accompanied in the picture.
Observe the picture and list down the changes that are accompanied in the picture.
- ______.
- ______.
- ______.
Higher order Thinking question Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
What is the difference between dissolution of sugar and burning of sugar ?
How the iron blade is fixed into a wooden handle in tools used to dig the soil?
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