Question

Which of the following is an example of man-made change?

• A. Formation of clouds
• B. Weathering of rocks
• C. Cooking of food
• D. Beating of the heart

Answer 1

The correct option is C

Cooking of food

The explanation for the correct option:

Option C

• Cooking food is a man-made change.
• Food is cooked by human beings.
• The things made by man are called man-made things.

Therefore option C is correct.

The explanation for the incorrect option:

Option A

• The formation of a cloud is a physical change.
• Cloud formation is a phase transformation cycle of natural water from liquid to gas and then gas to liquid.

Therefore option A is correct.

Option B

• Weathering of rocks is physical change as well as chemical change.
• Physical changes such as changes in temperature, humidity or the slop of the land cause weathering of rocks.
• The chemical breakdown of large stones includes the chemical reaction between parent rock material and rainwater and some other chemicals.
• So, weathering of rocks is not a man-made change.

Therefore option B is incorrect.

Option D

• The beating of the heart is a fast change.
• The changes that take short time to occur are called fast change.
• It is not man-made change.

Therefore option D is incorrect.