A) Drop water in the joints
B) Spread sand on the joints
C) Apply grease on the joints
D) Put chalk powder on the joints
Correct Answer: C
Solution :
Friction is the force that generates due to the interlocking of irregularities present between two surfaces in contact. The generation of this friction in between the surfaces of joints of the door is responsible for the noise. Therefore, to reduce this sound, the friction must be reduced by applying some lubricant over the joints. A lubricant will form a thin layer in between the moving surfaces to reduce the friction and hence, to reduce the noise. Grease is used as a lubricant. Hence, to reduce the noise of the door, Atul should lubricate the joints with grease. The correct answer is C.
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