Timekeeping devices. Grade 11

1) It's the earliest device which used the shadows cast by objects to tell the time.

• sundial

• pendulum clock

• quartz clock

• hourglass

2) It's a very simple device which was used to mark the passage of time. It used liquid to tell how much time passed.

• mechanical clock

• water clock

• atomic clock

• sundial

3) This clock appeared in the middle ages. They were not reusable, because their component was quite expensive at that time.

• hourglass

• mechanical clock

• water clock

• candle clock

4) This device appeared in the 11th century and used sand instead of water or candle.

• quartz watch

• sundial

• hourglass

• atomic clock

5) This clock didn't have a face and used bells to notify people of the timing of the events.

• mechanical clock

• atomic clock

• pendulum clock

• candle clock

6) This type of clock appeared in 1656 and it began to show a minute hand.

• mechanical clock

• pendulum clock

• quartz clock

• atomic clock

7) This type of timekeeping devices is very popular. The clock uses electicity to tell the time

• quartz wristwatch

• atomic clock

• pendulum clock

• mechanic clock

8) This type of clock is used to keep national and international standards of time, however it is very expensive.

• hourglass

• mechanical clock

• quartz wristwatch

• atomic clock