Measurement of Time and Motion
CBSE · Class 7 · Science
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Quick Quiz: Measurement of Time and Motion
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Which of the following devices was used in ancient times to measure time using the shadow of the Sun?
What is the SI unit of time?
A simple pendulum completes one oscillation when the bob moves from:
The formula for calculating speed is:
Sample Questions
Which of the following are examples of ancient time-measuring devices? (Select all correct answers)
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Water clock, Hourglass, Candle clock
Water clocks, hourglasses, and candle clocks were all used in ancient times. Digital watches and atomic clocks are modern inventions.
A car travels 100 km in 2 hours. What is its speed?
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50 km/h
Speed = Distance ÷ Time = 100 km ÷ 2 h = 50 km/h. The car covers 50 km in each hour.
The time period of a simple pendulum depends on:
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Length of the string only
The time period of a simple pendulum depends only on its length, not on the mass of the bob. All pendulums of the same length have the same time period at a given location.
In uniform linear motion, an object:
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Covers equal distances in equal time intervals
In uniform linear motion, the object moves with constant speed along a straight line, covering equal distances in equal time intervals.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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