Question

Which of the Following Is Not a Smooth Surface?

• A. The surface of wet soap
• B. Surface of tyres
• C. Glazed tiles
• D. Surface of mirror

Answer 1

The correct option is B

Surface of tyres

Reason for the correct option-

1. The surface of tires are kept rough because they require a high coefficient of friction
2. This is because tires need to produce a large force while accelerating or decelerating

Reason for the incorrect option-

1. The surface of wet soap is smooth due to the water molecules present on the surface which reduces the coefficient of friction
2. Glazed tiles have a low coefficient of friction too
3. The surface of mirror has a smooth finish because it increases its reflectivity