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Subject :NSO    Class : Class 6

Which of the following statements is false?

AMeasuring tape is not suitable to measure the girth of a tree.
BA suitable measuring device is must to measure the length of an object.
CIn ancient India, small length measurements used were an angul or a mutthi.
DElectric trains, monorail, supersonic aeroplanes and spacecrafts are some of the 20th century contributions.

I could not understand the solution to this question at all. Please give clearer and accurate solutions.

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