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9 questions · self-marked practice — reveal the answer and mark yourself.

Question 13 Marks
What is meant by Historic period?
Answer
  1. Unlike the Prehistoric period, we can trace the events and progress of the historic period.
  2. The historic period is the period for which written records are available.
  3. We can use these written records to write history.
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Question 23 Marks
What is meant by Prehistoric period?
Answer
  1. ‘Prehistory’ means ‘before history’.
  2. The prehistoric period is the period for which no written records are available.
  3. The history of this period has not been written down.
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Question 33 Marks
How are dating techniques used?
Answer
  1. By using dating techniques we learn how old the layers of soil and the remains found in them are.
  2. Then we can put approximate dates to their occurrence?
  3. For example, if an earthen pot is estimated to be five thousand years old with the help of dating techniques, we can say that the earthen pot dates back roughly to 3000 BC
  4. Then we can conclude that the period of the culture to which the pot belongs must be around 3000 BC.
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Question 43 Marks
How do we measure the length of time?
Answer
  1. There are various methods of measuring time.
  2. These methods allow us to identify a particular day, month, a year with respect to an earlier or later day, month or year.
  3. For example, if it is June, then we know that the earlier month was May and the next one will be July.
  4. If today is 10th of June, then we can tell that tomorrow will be 11th of June and yesterday was 9th of June.
  5. Thus, when we measure time we actually measure its length.
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Question 53 Marks
Explain time before the common or Christian era.
Answer
  1. The period of time before the common era is known as the time before Common Era (BCE) or Before Christ (BC).
  2. The years of this period are counted and written in reverse order.
  3. The first century before the common era began at the year 100 BCE and ended with 1 BCE.
  4. It is written as 100-1 BCE.
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Question 63 Marks
What is the unilinear division of time?
Answer
  1. Seven days from Monday to Sunday, make one week.
  2. Two weeks make a fortnight.
  3. Four weeks make a month.
  4. Twelve months make a year.
  5. One year is followed by another and, when 100 years go by, we have a century.
  6. When 10 centuries, ie. 1000 years are gone, a millennium is completed.
  7. Such a method of dividing time is known as a unilinear division of time.
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Question 73 Marks
How are days and nights formed?
Answer
  1. The earth receives light from the sun.
  2. As the earth rotates around its axis, that part of the surface which turns towards the sun becomes bright i.e. day.
  3. The part that moves away has darkness i.e. night thus days and nights are formed.
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Question 83 Marks
What are the units of measuring time?
Answer
  1. A second is the smallest unit of measuring time. Sixty seconds make a minute and sixty minutes make an hour.
  2. Twenty-four hours make a day; seven days make a week and two weeks make a fortnight.
  3. Four weeks (two fortnights) make a month and twelve months make a year.
  4. One hundred years make a century and ten centuries make a millennium.
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Question 93 Marks
What is meant by the unilinear division of time?
Answer
  1. Seven days make a week; two weeks make a fortnight and four weeks make a month.
  2. Twelve months make a year, a hundred years make a century and ten centuries make a millennium.
  3. This method of dividing time is known as the unilinear division of time.
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