It is easier to roll a barrel full of coal tar than to pull it because


Options: the full weight of the barrel comes into play when it is pulled,    the rolling friction is much less than the sliding friction,    more surface area of the barrel is in contact with the road when it is pulled,    coal tar is a liquid and it flows in the barrel when it is rolled

Ans:B,B






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What Sir Isaac Newton invented?
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In big cities like Delhi, Kolkata, Mumbai, Chennai police is headed by a
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Ans:D,D


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