Question: Ques:Read the following article and select the best answer. Article: We all know that the normal human daily cycle of activity is of some 7-8 hours' sleep alternating  with some 16-17 hours' wakefulness and that the sleep normally coincides with the hours of darkness. Our present concern is with how easily and to what extent this cycle can be modified. The question is no mere academic one. The ease, for example, with which people can change from working in the day to working at night is a question of growing importance in industry where automation calls for round-the-clock working of machines. It normally takes from five days to one week for a person to adapt to a reversed  routine of sleep and wakefulness, sleeping during the day and working at night. Unfortunately, it is often the case in industry that shifts  are changed every week; a person may work from 12 midnight to 8 a.m. one week, 8 a.m. to 4 p.m. the next, and 4 p.m. to 12 midnight the third and so on. This means that no sooner has he got used to one routine than he has to change to another, so that much of his time is spent neither working nor sleeping very efficiently. The only real solution appears to be to hand over the night shift to a number of permanent night workers. An interesting study of the domestic life and health of night-shift workers was carried out by Brown in 1957. She found a high incidence   of disturbed sleep and other disorders among those on alternating day and night shifts, but no abnormal occurrence of these phenomena among those on permanent night work. This latter system then appears to be the best long-term policy, but meanwhile something may be done to relieve the pressure of alternate day and night work by selecting those people who can adapt most quickly to the changes of routine. One way of knowing when a person has adapted is by measuring his body temperature. People occupied in normal daytime work will have a high temperature during the hours of wakefulness and a low one at night; when they change to night work the pattern will only gradually go back to match the new routine and the... Question: The best solution for implementing the 24-hour working system seems to be  _  . - to change shifts at longer intervals. - to have longer shifts - to arrange for some people to work on night shifts only - to create better living conditions for night workers

Ans:to arrange for some people to work on night shifts only
-----
Ques:Read the following article and select the best answer. Article: It is easier to float in the ocean than it is to float in a swimming pool. Do you know why?          Ocean water is full of salt-- and salt water can hold up more weigh than fresh water. See for yourself!          You Will Need: *  3 cups of warm water *  Measuring cup   *  Wide-mouthed jar *  Salt *  Spoon  *  Raw  potato You Will Do:  Pour 1.5 cups      of warm water into the jar.Add 1/3 cup of      salt.Stir  until the      salt is completely dissolved.Add another      1.5 cups of water. Pour it slowly over the back of the spoon into the jar      so that the two liquid will not mix together. Gently      place the potato into the jar. Do not drop it. What Will Happen: The potato will sink-- but only halfway! Why? Salt water is heavier than fresh water, so it will stay on the bottom. The fresh water will remain on top. The potato is heavier than the fresh water, but it is lighter than the salt water. That is why the potato will sink halfway down. Question: In which step of the experiment do you add the salt? - Step 1 - Step 2 - Step 3 - Step 4

Ans:Step 2
-----
Ques:Read the following article and select the best answer. Article: Do you sometimes put off doing your homework on a school night to watch TV?A new study says that middle school students who watch TV or play video games during the week do worse in school. The study also says that watching TV and playing video games on weekends don't affect school performance that much.  "They could watch a lot on weekends and it didn't seem to connect with doing worse in school,"said Dr. Iman Sharif of Children's  Hospital at Montefiore inprefix = st1 /New York. The study appears in the October issue of Pediatrics. Researchers drew their conclusions after surveying   4,500 students in New Hampshire and Vermont middle schools.  To reach their findings,researchers didn't look at grades or test scores. Instead,they asked students to rate their own performance on a scale ranging from "excellent'' to "below".  Other studies have found a connection between kids' ability to learn and the amount of TV they watch. One study even found that kids with televisions in their bedrooms scored about eight points lower on math and language arts tests than kids without them.  What should fl kid do?The American Academy of Pediatrics recommends that kids watch TV no more than two hours and that televisions be kept out of children's  rooms. Weekend viewing should be kept to four hours at most each day. Question: Which of the following is TRUE according to the passage? - Researchers did the survey by studying the students' test scores. - Students' learning ability has nothing to do with the amount of TV they watch. - Children with televisions in their rooms do better at school than those without them. - Children shouldn't watch TV for more than four hours each day at weekends.

Ans:Children shouldn't watch TV for more than four hours each day at weekends.
-----
Ques:Read the following article and select the best answer. Article: The fact that blind people can see things using parts of their bodies apart from their eyes may help us to understand our feelings about color.If they can sense color differences, then perhaps we, too, are affected by color without knowing it.Salesmen have discovered by experience over a long period of time that sugar sells badly in green wrappings, that blue foods are considered not agreeable to the taste, and that cosmetics  should never be packed in brown.These discoveries have grown into a whole subject of color psychology. Some of our preferences are clearly psychological.Dark blue is the color of the night sky and therefore connected with calm, while yellow is a day color connected with energy and encouragement.Experiments have shown that colors, partly because they are connected with psychology, also have a direct effect on people's mind.People in bright red surroundings show an increase in breathing speed, heartbeat and blood pressure.Red is exciting.Pure blue has exactly the opposite effect; it is a calming color.Being exciting, red was chosen as the signal for danger, but a closer study shows that a bright yellow can produce a more basic state of alarm, so fire engines in some advanced areas are now rushing around in bright yellow colors that stop buses, trucks and cars. Question: The passage tells us that salesmen have  _   . - tried colors on blind people - found out that colors affect sales - developed a special subject of color psychology - discovered the relationship between color and psychology

Ans:
Answer: found out that colors affect sales
-----