Match the statements in column A with those in column Column A Column B 1. A device in which falling sand is used as a timing device. (a) Watch 2. When a body covers equal distances in equal intervals of time. (b) Speed 3. A device in which a pendulum is used as a timing device. (c) Sand clock 4. A device in which a balance wheel is used as a timing device. (d) Wall clock 5. The ratio between the distance covered and the time. (e) Uniform motion

1 . A device in which falling sand is used as a timing device - (c) Sand clock Sand clock is a device in which falling sand is used as a timing device. It is also known as hourglass. 2 . When a body covers equal distances in equal intervals of time - (e) Uniform motion When a body covers equal distance in equal intervals of time is called uniform motion. The nature of the distance-time graph for uniform motion is straight line. 3 . A device in which a pendulum is used as a timing device - (d) Wall clock Wall clock is a device in which pendulum is used as a timing device. Pendulum takes one second for one oscillation in wall clock. 4 . A device in which a balance wheel is used as a timing device - (a) Watch Watch is a device in which a balance wheel is used as a timing device. Balance wheel serves same purpose as pendulum. 5 . The ratio between the distance covered and the time - (b) Speed Speed is the ratio between the distance covered and the time. S.I. unit of speed is m / s . Column A Column B 1. A device in which falling sand is used as a timing device. (c) Sand clock 2. When a body covers equal distances in equal intervals of time. (e) Uniform motion 3. A device in which a pendulum is used as a timing device. (d) Wall clock 4. A device in which a balance wheel is used as a timing device. (a) Watch 5. The ratio between the distance covered and the time. (b) Speed

Time is defined as the gap between two events. Since the earliest days of civilizations, the gap between two successive noons is taken as unit of time and is called day or a solar day. One solar day or day consists of 24 hours.

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Learning Elementary Science for Class 7>Chapter 13 - Time and Motion>EXERCISES>Q IV

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The gap between two events is called time

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Important Questions on Time and Motion

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Learning Elementary Science for Class 7>Chapter 13 - Time and Motion>EXERCISES>Q IV

Sand clock works only during day time.

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Learning Elementary Science for Class 7>Chapter 13 - Time and Motion>EXERCISES>Q IV

A decade is

10

times smaller than a century.

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Learning Elementary Science for Class 7>Chapter 13 - Time and Motion>EXERCISES>Q IV

Digital watches use pendulum as timing device.

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Learning Elementary Science for Class 7>Chapter 13 - Time and Motion>EXERCISES>Q IV

Balance wheel is used in stop watches.

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Learning Elementary Science for Class 7>Chapter 13 - Time and Motion>EXERCISES>Q V

Match the statements in column A with those in column

Column A	Column B
1. A device in which falling sand is used as a timing device.	(a) Watch
2. When a body covers equal distances in equal intervals of time.	(b) Speed
3. A device in which a pendulum is used as a timing device.	(c) Sand clock
4. A device in which a balance wheel is used as a timing device.	(d) Wall clock
5. The ratio between the distance covered and the time.	(e) Uniform motion