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CBSE Class 7 Science Chapter 8 Measurement of Time and Motion Worksheet - Free Download
Q.1. True or False
(i) The SI unit of speed is kilometre per hour.
(ii) Candle clocks were used to measure time in ancient India.
(iii) In non-uniform motion, the speed of the object remains the same.
(iv) All pendulums of the same length have the same time period at the same location.
(v) Distance is measured in metres and time in seconds.
Q.2. Fill in the blanks.
(i) The metallic ball is called the ____ of the pendulum.
(ii) The symbols of all units are written in ____.
(iii) The time taken by the pendulum to complete one oscillation is called its ____.
(iv) One microsecond is one ____ of a second.
(v) A nanosecond is one ____ of a second.
(vi) The distance-time graph for the motion of an object moving with a constant speed is a ____.
Answer the following Questions
Q.3. Give an example of oscillatory motion.
Q.4. What is uniform motion?
Q.5. An object moving along a straight line with a constant speed is said to be in uniform motion.
Q.6. What is distance-time graph?
Q.7. What is oscillatory motion?
Q.8. What is non-uniform motion?
Q.9. What is the basic unit of speed?
Q.10. A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
Q.11. When pendulum is said to have one complete oscillation?
Q.12. Explain how in ancient time a day, a month and a year were measured?
Q.13. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
Q.14. Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.
Q.15. What is speedometer?
Q.16. What are quartz clocks?
For Worksheet Solutions, go to Worksheet Solutions: Measurement of Time and Motion
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FAQs on CBSE Class 7 Science Chapter 8 Measurement of Time and Motion Worksheet - Free Download
| 1. What is the importance of measuring time in scientific experiments? |  |
Ans. Measuring time is crucial in scientific experiments because it allows scientists to accurately assess the duration of events, understand the sequence of actions, and analyze rates of reaction or motion. Precise time measurement helps in replicating experiments and validating results, ensuring consistency and reliability in scientific studies.
| 2. How do we measure motion in everyday life? | |
Ans. We measure motion in everyday life using various tools and methods, such as stopwatches to time activities, speedometers in vehicles to gauge speed, and measuring tapes or rulers to determine distances. Understanding motion involves observing changes in position over time, which can be calculated using distance and time.
| 3. What are the different units of time, and how are they related? | |
Ans. The primary units of time include seconds, minutes, hours, days, weeks, months, and years. These units are related as follows: 60 seconds make 1 minute, 60 minutes make 1 hour, 24 hours make 1 day, 7 days make 1 week, about 4 weeks make 1 month, and 12 months make 1 year. Understanding these relationships helps us convert between units when measuring time.
| 4. How does the concept of speed relate to time and motion? | |
Ans. Speed is defined as the distance traveled per unit of time. It relates to time and motion by providing a measure of how quickly an object is moving. The formula for speed is speed = distance/time. This means that if you know the distance an object travels and the time it takes, you can calculate its speed, which is essential for understanding motion.
| 5. What are some common sources of error in time and motion measurements? | |
Ans. Common sources of error in time and motion measurements include human reaction time when using stopwatches, misreading instruments, environmental factors like wind resistance affecting motion, and inconsistent starting or stopping points. Recognizing these errors is important to improve accuracy and reliability in measurements.
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