NCERT Class VI Science Solutions: Chapter 10 – Motion and Measurement of Distance Part 4
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Question 13:
The photograph given as Fig, shows a section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of this section, so that the payment could be made to the contractor?
Answer:
The length can be measured using a thread which can be further measured with the help of a scale.
Question 14:
Identify the different types of motion in the following word diagram given as Fig.
Answer:

Lanoitator

Rectilinear

Periodic

Circular
Question 15:
Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.

Sam measured it with a half metre long thread.

Gurmeet measured it with a 15 cm scale from her geometry box.

Reena measured it using her hand span.

Salim measured it using a 5 m long measuring tape.
Which one of them would get the most accurate length? Give reason for your answer.
Answer:
Salim would get the most accurate length. The reason is that in this case the length of the table can be measured in one go because the measuring tape is longer than the table. In the other cases the chance of making an error is higher due to multiple measurement. In case of Sam, he can measure the lengths which are exact multiples of half a meter. Gurmeet measure it with a 15 cm scale so, its multiple measurement so, more chance of a making error. And Reena use her hand span, it not give accurate measurement.