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Q.

Which instrument is helpful for measuring the length of the book?


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a

Scissors

b

Scale

c

Pencil

d

Sellotape 

answer is B.

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Detailed Solution

A scale is helpful for measuring the length of the book.
One can easily measure the length of a book with the help of a scale. The metric units of length are centimetres, metres, kilometres etc. One can take a scale of length described in centimetres and place the zero end of the scale on one end of the book and write down the reading of another end of the scale, where the scale touches the other end of the book. The recorded reading is the length of that book in centimetres.
 
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