Question

Metal Rim Is Fixed to the Wooden Cart Wheel by

• A. Heating Metal Rim
• B. Heating Wooden Wheel
• C. Cooling Metal Rim
• D. Cooling Wooden Wheel

Answer 1

The correct option is A

Heating Metal Rim

Explanation of Correct Answer:

Option A Heating Metal Rim:

• In a physical change, the molecules of a substance are rearranged but the composition of the substance remains constant.
• Physical change is reversible which means that the original can be recovered.
• The metals on heating undergo the process of expansion because the distance between the molecules increases a bit when the constituent molecules absorb the energy, this results in the expansion.
• An iron rim is made in order to make the wooden wheel work for a longer period of time.
• In order to give it a tight fix, the rim is usually made smaller than the size of the wheel.
• To fix the metal rim, it should be heated at first so that the rim expands and accordingly and fits onto the wheel.
• Then Coldwater has then put over the rim so that the metal rim contracts and fits tightly onto the wooden wheel
• Hence, the correct answer is Option (A) Heating Metal Rim.

Explanation of incorrect Answers:

Option B Heating Wooden Wheel

• The wooden wheel won't expand or contract on heating.
• So, The metal rim can't be fixed on the wooden cartwheel by heating the wooden wheel.
• Hence option (B) Heating Wooden Wheel is incorrect.

Option C Cooling Metal Rim

• The metal rim won't expand or contract on cooling.
• So, The metal rim can't be fixed on the wooden cartwheel by cooling the wooden wheel.
• Hence option (C) Cooling Metal Rim is incorrect.

Option D Cooling wooden wheel

• The wooden wheel won't expand or contract on cooling.
• So, The metal rim can't be fixed on the wooden cartwheel by cooling the wooden wheel.
• Hence option (D) Cooling Wooden Wheel is incorrect.