Question

Which of the following statements about a lubricant is correct?

• A. It increases friction between two surfaces.
• B. It reduces friction between two surfaces.
• C. It increases heat between two surfaces.
• D. It reduces heat between two surfaces.

Answer 1

Answer: (B), (D)

The correct options are
B

It reduces friction between two surfaces.

D

It reduces heat between two surfaces.

Friction causes wear and tear of the moving parts of a machine. In order to prevent or reduce friction, we use lubricants like oil, grease etc. A lubricant reduces friction between the surfaces, and hence, reduces the heat between two surfaces.