Humans have used different objects to tell time. In the beginning, they used an hourglass. This is a cylindrical glass with a narrow center which allows sand to flow from its upper to its lower portion. Once all the sand has trickled to the lower portion, one knows that an hour has passed. Using the same idea, water clocks were constructed to measure time by having water flow through a narrow passage from one container to another. On the other hand, sundials allowed people to estimate an hour by looking at the position of the shadow cast by the sun on a plate. At night, people measured time by checking the alignment of the stars in the sky. None of these were accurate, though. The clock was the first accurate instrument for telling time.

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I have read and understand the text.
Click the letter of the correct answer.
1. Which of the following ways of telling time made use of sand? (Literal)
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1 point
a. water clocks
b. hourglass
c. sundials
d. clock
2. None of the clocks used long ago were accurate. Accurate in the sentence means (Inferential)
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1 point
a. free from error
b. comparable
c. very useful
d. efficient
3. When men of long ago told time at night, they looked at the __________________ to tell the time. (Literal)
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1 point
a. cloud formation
b. moon
c. stars
d. sun
4. The sundials may not be useful in telling time ______________________. (Inferential)
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1 point
a. at noontime
b. in the morning
c. during a rainy day
d. when the sun shines brightly
5. How are the hourglass and the water clock similar? (Inferential)
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1 point
a. Both tell time by the hour.
b. Both use water to tell time.
c. Both are used only in the daytime.
d. Both have a narrow center through which something flows.
6. The best title of the selection is ______________________. (Critical)
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1 point
a. The Uses of Clocks
b. Why People Need to Tell Time
c. Ways of Telling Time: Then and Now
d. Comparing the Different Types of Clocks
7. Which of these sentences is a topic sentence? (Critical)
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1 point
a. The invention of the clock 600 years ago was the first accurate measurement of time.
b. Hourglass contained sand that fell through one container to another.
c. Long ago people used simple tools such as the hour glass.
d. Humans have used different objects to tell the time.