Q. Which of these reduces friction?

इनमें से कौन घर्षण को कम करता है?

A
Oil
तेल
B
Water
पानी
C
Grease
ग्रीज़
D
All of these
इन सब

Explanation

Lubricants such as oil, water, and grease reduce friction between surfaces by creating a thin layer that separates the surfaces and minimizes direct contact, allowing smoother motion.

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