Q.

A standard unit should be

(i) consistent              

(ii) reproducible

(iii) Invariable           

(iv) Easily available

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a

              Only 1 and 2 are true

b

only 1 and 3 are true

c

           Only 1, 3 and 4 are true

d

           1, 2, 3 and 4 are true

answer is D.

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Detailed Solution

A standard unit should be

So we get option (D) as correct

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