📘 Chapter 5 – Changes Around Us: Physical and Chemical

🔹 Part 3: Natural Changes (Q51–Q75)

Q51. Which of the following is a natural change?

A) Melting ice cube
B) Burning paper
C) Growing of plants
D) Cutting wood

✅ Answer: C) Growing of plants

Explanation:

• Plant growth → Natural and irreversible.
• Others are man-made.

Q52. Which of these is a slow natural change?

A) Earthquake
B) Rusting of iron
C) Lightning
D) Burning of fuel

✅ Answer: B) Rusting of iron

Q53. Which of these is a fast natural change?

A) Formation of coal
B) Flood
C) Growth of child
D) Ripening of fruit

✅ Answer: B) Flood

Q54. The rotation of Earth causing day and night is:

A) Slow change
B) Periodic change
C) Irreversible change
D) All of these

✅ Answer: B) Periodic change

Q55. Which natural change is irreversible?

A) Tides
B) Growing of trees
C) Melting of ice
D) Seasons

✅ Answer: B) Growing of trees

Q56. Which natural change is reversible?

A) Evaporation of water
B) Rusting of iron
C) Earthquake
D) Burning of forests

✅ Answer: A) Evaporation of water

Q57. The change of seasons is:

A) Non-periodic change
B) Periodic change
C) Irreversible change
D) Sudden change

✅ Answer: B) Periodic change

Q58. Which natural change is desirable?

A) Flood
B) Photosynthesis
C) Drought
D) Volcano eruption

✅ Answer: B) Photosynthesis

Q59. Which natural change is undesirable?

A) Rainfall
B) Earthquake
C) Growth of plants
D) Formation of soil

✅ Answer: B) Earthquake

Q60. The water cycle in nature is an example of:

A) Physical change only
B) Periodic natural change
C) Irreversible change
D) Sudden change

✅ Answer: B) Periodic natural change

Q61. Which natural change is periodic?

A) Earthquake
B) Tides
C) Volcanic eruption
D) Landslide

✅ Answer: B) Tides

Q62. Which natural change occurs due to movement of tectonic plates?

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

✅ Answer: C) Earthquake

Q63. Which of these is NOT a natural change?

A) Lightning
B) Formation of soil
C) Growth of plants
D) Melting of wax candle

✅ Answer: D) Melting of wax candle

Q64. Which of these is both natural and chemical change?

A) Photosynthesis
B) Melting of ice
C) Boiling water
D) Condensation

✅ Answer: A) Photosynthesis

Q65. Which natural change is very slow?

A) Rusting of iron
B) Formation of mountains
C) Rotation of Earth
D) Growth of child

✅ Answer: B) Formation of mountains

Q66. Which natural change is very fast?

A) Flood
B) Formation of coal
C) Growth of plants
D) Rusting of iron

✅ Answer: A) Flood

Q67. Which natural change involves a chemical reaction?

A) Photosynthesis
B) Respiration
C) Rusting of iron
D) All of these

✅ Answer: D) All of these

Q68. The change of water into clouds and rain is:

A) Physical reversible change
B) Chemical irreversible change
C) Periodic natural change
D) Both A and C

✅ Answer: D) Both A and C

Q69. Formation of soil from rocks is:

A) Physical change
B) Chemical change
C) Very slow natural change
D) All of these

✅ Answer: D) All of these

Q70. Which natural change is harmful?

A) Photosynthesis
B) Earthquake
C) Rainfall
D) Germination of seeds

✅ Answer: B) Earthquake

Q71. Which natural change is helpful to farmers?

A) Photosynthesis
B) Earthquake
C) Drought
D) Landslide

✅ Answer: A) Photosynthesis

Q72. Which natural change involves both physical and chemical changes?

A) Burning of forest
B) Photosynthesis
C) Water cycle
D) Respiration

✅ Answer: A) Burning of forest

Q73. Which natural change causes seasons?

A) Rotation of Earth
B) Revolution of Earth
C) Tilt of Earth’s axis
D) Both B and C

✅ Answer: D) Both B and C

Q74. Which of these is a desirable natural change?

A) Ripening of fruits
B) Rusting of iron
C) Flood
D) Volcano

✅ Answer: A) Ripening of fruits

Q75. Which of these is a non-periodic natural change?

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

✅ Answer: A) Earthquake

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