Q.1 Static friction is less than (a) sliding friction (b) rolling friction (c) both (a) and (b) (d) none of these Q.2 If we apply oil on door hinges, the friction will (a) increase (b) decrease (c) disappear altogether (d) will remain unchanged Q.3 Which of the following is responsible for wearing out of bicycle tyres? (a) Muscular force (b) Magnetic force (c) Frictional force (d) Electrostatic force
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Answer:
Q.1-(c)both
Q.2-(b)decrease
Q.3-(c)frictional force
Explanation:
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