📘 Chapter 5 – Changes Around Us: Physical and Chemical

🔹 Part 4: Mixed Conceptual + Revision MCQs (Q76–Q100)

Q76. Which of these is a physical change?

A) Melting of butter
B) Rusting of iron
C) Burning of paper
D) Cooking of rice

✅ Answer: A) Melting of butter

Explanation: Melting is reversible, no new substance. Others are chemical.

Q77. Which of these is a chemical change?

A) Freezing water
B) Evaporation of alcohol
C) Digestion of food
D) Dissolving sugar

✅ Answer: C) Digestion of food

Q78. Which of these is both a physical and chemical change?

A) Burning of candle
B) Breaking chalk
C) Tearing paper
D) Melting wax

✅ Answer: A) Burning of candle

Q79. Which natural change is irreversible?

A) Melting of snow
B) Day and night
C) Growth of plants
D) Tides

✅ Answer: C) Growth of plants

Q80. Which process is a periodic change?

A) Photosynthesis
B) Day and night
C) Burning matchstick
D) Breaking glass

✅ Answer: B) Day and night

Q81. Which of these changes is desirable?

A) Burning of forests
B) Photosynthesis
C) Floods
D) Rusting of bridges

✅ Answer: B) Photosynthesis

Q82. Which of the following is a reversible change?

A) Dissolving salt in water
B) Cooking food
C) Rusting of iron
D) Burning of coal

✅ Answer: A) Dissolving salt in water

Q83. Which of these is an undesirable chemical change?

A) Ripening of fruits
B) Photosynthesis
C) Rusting of iron
D) Cooking food

✅ Answer: C) Rusting of iron

Q84. Formation of soil from rocks is:

A) Fast change
B) Very slow natural change
C) Man-made change
D) Reversible

✅ Answer: B) Very slow natural change

Q85. Which change involves release of heat and light?

A) Burning of candle
B) Melting ice
C) Dissolving sugar
D) Breaking chalk

✅ Answer: A) Burning of candle

Q86. Which change does NOT form a new substance?

A) Burning of wood
B) Rusting of iron
C) Melting of ice
D) Souring of milk

✅ Answer: C) Melting of ice

Q87. Which natural change provides oxygen to living beings?

A) Respiration
B) Photosynthesis
C) Evaporation
D) Rainfall

✅ Answer: B) Photosynthesis

Q88. Which change is opposite of photosynthesis?

A) Respiration
B) Combustion
C) Melting
D) Dissolution

✅ Answer: A) Respiration

Q89. Which is NOT an example of chemical change?

A) Respiration
B) Burning fuel
C) Digestion
D) Boiling water

✅ Answer: D) Boiling water

Q90. Which gas is released during respiration?

A) Oxygen
B) Carbon dioxide
C) Hydrogen
D) Nitrogen

✅ Answer: B) Carbon dioxide

Q91. Which natural change is sudden and harmful?

A) Tides
B) Seasons
C) Earthquake
D) Day and night

✅ Answer: C) Earthquake

Q92. Which type of change is condensation of water vapour?

A) Physical
B) Chemical
C) Both
D) Irreversible

✅ Answer: A) Physical

Q93. Which change helps in bread-making?

A) Freezing water
B) Fermentation
C) Dissolution
D) Boiling

✅ Answer: B) Fermentation

Q94. Which change occurs when milk turns into curd?

A) Physical
B) Chemical
C) Both
D) Reversible

✅ Answer: B) Chemical

Q95. Which change is caused by bacteria?

A) Evaporation
B) Souring of milk
C) Melting of ice
D) Condensation

✅ Answer: B) Souring of milk

Q96. Which natural change occurs due to Earth’s revolution?

A) Day and night
B) Seasons
C) Tides
D) Rain

✅ Answer: B) Seasons

Q97. Which change is responsible for cloud formation?

A) Condensation
B) Evaporation
C) Freezing
D) Both A and B

✅ Answer: D) Both A and B

Q98. Which of these is a fast man-made chemical change?

A) Rusting of iron
B) Burning cracker
C) Ripening of fruit
D) Photosynthesis

✅ Answer: B) Burning cracker

Q99. Which is a slow natural chemical change?

A) Digestion of food
B) Photosynthesis
C) Formation of coal
D) Explosion of firecracker

✅ Answer: C) Formation of coal

Q100. Which statement is true about physical and chemical changes?

A) Physical changes always produce new substances
B) Chemical changes are usually irreversible
C) Physical changes are always harmful
D) Chemical changes are always reversible

✅ Answer: B) Chemical changes are usually irreversible

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