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Important questions based on NCERT syllabus for Chapter 10 - Motion and Measurement of Distances:
Question-1: Discuss significance of measurement. Give examples where you use measurement.
Solution: Measurement helps us to compare unknown quantities with the known quantities. Measurement helps us make quantitative statements about how big, how long, how fast things are. Without measurement, final product will be full of errors. Examples:-Speedometer is used to measure the speed of the vehicles. Measuring tape is used to measure length of anything.
Question-2: Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?
Solution: Since the tape is stretchable, when you will measure anything it will give inaccurate measurements. Therefore we cannot use it for measuring purposes. While measuring a distance, we need to tell someone how much tape has been stretched which is difficult to measure. It leads to incorrect measurements. We cannot measure manually how much the tape has been stretched, hence it is wrong to use elastic tape for measurements.
Question-3: Why do we use standard unit of length for measurements?
Solution: In ancient times, people used length of a foot, the width of a finger, the distance of a step as units of measurement. This caused confusion and a need to develop a uniform system of measurement arose. Hence, a common unit of length is decided and all the measurements is done according to that unit of length.