Direction: Read the passage carefully and answer the questions given at the end by picking out the most suitable response to each question.
Sweating can keep us cool at very high temperatures, provided the air is dry. In a Turkish bath, for instance, some of the rooms are made very hot in order to bring on sweating. The actual temperature of the hottest room is generally almost as high as that of boiling water; but people can sit in it without coming to any harm, because the dry heat makes the sweat pour out of them and the rapid evaporation of the sweat keeps them cool. In fact, men have actully stayed in an oven while meat was being cooked in it, and have only come out when their hair began to singe ! If they had not been able to sweat they would have been cool ,d too, but by sweating prodigiously they were able to keep themselves cool enough to be undamaged. They have to drink a great deal of water before such an adventrue, so that there may be a good supply of moisture for sweat.
The amount of water which the sweat-glands can secrete out of the blood on to the surface of the skin is very large. There is a record of an English awl-miner who produced 18 lbs. of sweat (nearly 2 gallons) in 51/2 hours.
But in air which is not dry, sweating cannot keep mewl so easily. It is harder for the sweat to evaporate, us-.1 it is the evaporation which cools us. If the air is saturated with moisture-in other words, so full of saner vapour that it can hold no more-then sweat may pour off us, but none of it can evaporate, and it does us no good. If a man is put in air saturated with warm vapour at a temperature higher than the normal temperature of his body, his own temperature will ate, and he will become very ill and may even die, if Ile stays there any length of time.
So on very muggy days and in parts of the world lie the Gold Coast, where the climate is hot and mussy. people feel much more uncomfortable than they do even at much higher temperatures where it is dry
1. People can sit in the hottest room of a Turkish bath because
(A) they take cool drinks at regular intervals
(B) they wear heat proof clothes
(C) profuse sweating keeps them cool in the dry air
(D) the room has adequate ventilation
2. People can stay in an oven provided
(A) they have a bath before entering it
(B) they drink sufficient quantities of water
(C) they shave off their head before entering the oven
3. An English miner is reported to have produced
(A) 5 gallons of sweat in 18 hours
(B) 18 gallons of sweat in 5 hours
(C) 2 gallons of sweat in 5 hours
(D) 2 gallons of sweat in 18 hours.
4. Sweating cannot keep a person cool in
(A) warm air
(B) humid air
(C) dry air
5. A suitable title for this passage can be
(A) How to Stay in an Oven
(B) Sweat & Keep cool
(C) Inside a Turkish Bath
(D) Blow Hot, Blow Cold
6. So-eating does not give relief in humid air because
(A) these is hardly any evaporation to cause cooling
(B) the temperature does not rise very high
(C) the sweat glands become inactive in humid air