Q9. What kind of substances are known as lubricants?
ल्यूबीकेन्ट्स किसे कहते हैं?
(a) Which increases friction/जो फ्रिक्शन बढ़ाता है
(b) Which increase or decrease friction/जो फ्रिक्शन बढ़ाता या घटाता
Which decreases friction/जो फ्रिक्शन घटाता है
(d) None of these/ इनमें से कोई नहीं
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Answer:
option C which decreases friction
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