Directions (Q.No. 86-90): Read the following passage and answer the questions that follow.

You have all seen birds flying. For thousands of years, men watched the birds and wondered how they had this marvellous gift of flying. Looking at these birds, man first began dreaming about going up in the sky. Men tried to copy these birds. They tried to make big kites which could carry them up. They tried various methods but could not fly.

One winter night, a man was sitting near the fire. While looking at the fire, he saw smoke rising from it. The man watching the smoke wondered if the smoke could also take other things up with it. He made a bag of silk and burnt some paper below it. As soon as the smoke collected in the bag it started rising up.

Several other people also tried this experiment and were successful. They made bigger and bigger bags and filled them with hot air. In big balloons, they put animals in a small cage and sent them up in the air. When the animals returned safely, they sent up a man in a balloon. Balloons could fly only in the direction which the wind blow. Improvements began to take place and the could stay in the air much longer.

Some people were also trying to experiment with other methods of flying in the air. One new method was of flying in gliders. A glider is like a present day aeroplane, but has no machine or engine. Unlike the balloons, the pilot of a glider can cantrol the direction of travel but the glider can stay up only as long as the currents of air can support it.

In America, two brothers, Wilbur and Orville Wright, were carrying out experiments at the same time. They were known as the ‘Wright Brothers'. They worked hard and tried several experiments. In 1903, they were able to make a machine which could fly in the air.

Although the first really successful flight took place in 1903, an Italian named Leonardo da Vinci had thought of a rough form of aeroplane more than five hundred years ago.

The first machine was not very good. Before showing in to the people many improvements had to be made. The people were delighted to see the machine fly. The public gradually began to take interest in these machines.

Question: A glider can remain in the air only as long as

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