English Language & Literature

Case Based Factual Passage

Class 10

Multiple Choice Questions Type

Case Study Based Factual Passage 02

Read the passage and answer the questions that follow:

  1. Scientists understand some of the reasons for sleep. But they do not understand everything about it. There are two kinds of sleep in mammals and birds. One is Rapid Eye Movement sleep, which we call REM sleep. The other is Non–Rapid Eye Movement sleep, which we call NREM or non–REM sleep. The American Academy of Sleep Medicine divides NREM sleep into three stages: N1, N2, and N3 sleep.
  2. When people first go to sleep, they are in NREM sleep. The first stage of NREM sleep is N1 sleep. During N1 sleep, people get very drowsy. Some people have muscle twitches during this part of sleep. People are not very conscious of, or aware of, their surroundings during this stage of sleep. Brain monitors identify small, slow, and irregular brain waves during N1 sleep.
  3. The second stage of sleep is N2 sleep. People are not at all conscious of their surroundings during N2 sleep. About 45%-55% of total adult sleep is N2 sleep. Brain monitors identify large brain waves with quick bursts of activity during N2 sleep.
  4. The third stage of sleep is N3 sleep. It is very deep sleep. Brain monitors identify very slow brain waves during N3 sleep. Therefore, N3 sleep is called slow–wave sleep (SWS.) After N3 sleep, people cycle back to lighter N2 sleep before going into REM sleep. People cycle through the stages of NREM sleep 4 or 5 times each night and enter REM sleep several times during one night.
  5. Scientists are not sure of all the reasons for sleep. They know that sleep helps the body heal and grow. Sleep helps the immune system – which helps people fight disease. Sleep helps the infant brain grow. It seems that REM sleep is especially important for babies’ brain growth. It also seems that sleep is a time for processing memories. The National Sleep Foundation in the United States says that 7-9 hours of sleep daily is best for an adult. Seven to nine hours of sleep is good for memory, alertness, problem solving, and health. Less than six hours of sleep affects the ability to think. Getting too much sleep may not be good for people either. Too much sleep is linked to sickness and depression.

Question.1.
The purpose of the research by National Sleep Foundation in the United States was to study the_____. Choose the correct option.

(a) mechanism of how and why we dream while sleeping.
(b) optimum amount of sleep an adult need.
(c) immune action in body during sleep.
(d) impact of sleep in an infant’s brain growth.

(b) optimum amount of sleep an adult need

Question.2.
Select the option that is true for the two statements given below.
(1) During N1 sleep, people get very drowsy.
(2) Brain monitors identify small, slow, and irregular brain waves during N1 sleep.

(a) (2) is the opposite of (1).
(b) (2) contradicts (1).
(c) (1) is independent of (2).
(d) (1) is the reason for (2).

(d) (1) is the reason for (2)

Question.3.
Select the option that gives the correct meaning of the following statement.
About 45%-55% of total adult sleep is N2 sleep.”

(a) In a 9-hour sleep cycle, an adult goes through 5 hours of N3 sleep.
(b) Almost all of the sleep cycle of an adult comprises of N2 sleep.
(c) In an 8-hour sleep cycle, an adult approximately goes through 4 hours of N2 sleep.
(d) The total adult sleep fluctuates a lot between N2 and N3 cycles.

(c) In an 8-hour sleep cycle, an adult approximately goes through 4 hours of N2 sleep.

Question.4.
According to the American Academy of Sleep Medicine research, the Non–Rapid Eye Movement sleep is ____.

(a) divided into three stages based on the difference in brain wave patterns.
(b) sub-categorised into three types where people can see dreams.
(c) where mammals and birds make rapid eye movements while sleeping.
(d) followed by a cycle of REM sleep of N1, N2 and N3 type.

(a) divided into three stages based on the difference in brain wave patterns.

Question.5.
Select the option listing what the given sentence refers to.
People cycle through the stages of NREM sleep 4 or 5 times each night.’
(1) People go through N1 sleep several times a night.
(2) People experience N3 sleep only once in a night.
(3) The cycles of N1, N2 and N3 sleep happens 4-5 times.
(4) People do not stay in one stage of NREM sleep all night.
(5) The cycles of NREM happens randomly without any sequence.

(a) (1), (2) and (4)
(b) 10 (1), (3) and (5)
(c) (1), (3) and (4)
(d) (1), (2) and (3)

(c) (1), (3) and (4)

Question.6.
On what from the following did the scientists study the effects of sleep in helping people fight disease?

(a) brain growth
(b) infants
(c) dream patterns
(d) immune system

(d) immune system

Question.7.
The passage lists an example proving that sleep _______.
Select the correct option.

(a) follows only one pattern of brain wave cycles all night.
(b) is necessary for the growth and health of every individual.
(c) is beneficial only for over 10 long hours a day.
(d) is the unconscious state of human body where nothing happens in the brain.

(b) is necessary for the growth and health of every individual.

Question.8.
Choose the correct option to answer the following:
According to paragraph 5, ‘They know that sleep helps the body heal and grow.’ This is so because:

(a) they have been told so for generations.
(b) scientists are not sure of all the reasons for sleep.
(c) sleep is good for memory, alertness, problem-solving, andhealth.
(d) too much sleep is linked to sickness and depression.

(c) sleep is good for memory, alertness, problemsolving, and health.

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