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Directions for questions: You have a passage followed by questions based on it. Read the passage carefully and choose the best answer to each question out of the four alternatives. Most of us use the products of science, railways, aeroplanes, electricity, wireless and thousand of others-without thinking how they came into existence. We take them for granted, as if we were entitled to them as a matter of right. And we are very proud of the fact that we live in an advanced age and are ourselves so very advanced. Now, there is no doubt that our age is a very different one from previous ages and I think it is perfectly correct to say that it is far more advanced. But this is a different thing from saying that we as individuals or groups are more advanced. It would be the height of absurdity to say that because an engine- driver can run an engine and Plato or Socrates could not, the engine driver is more advanced than or is superior to Plato or Socrates. But it would be perfectly correct to say that the engine itself is a more advanced -method of locomotion than Platos chariot was.

Many of us make use of machines-

A)  with very little knowledge of their mechanism.

B)  without any knowledge of their historical significance.

C)  with full knowledge of their genesis.

D)  without knowing how they were in-vented.