A 30 m steel tape was standardised at 20°C measurements of distances were taken as 15°C. If the coefficient of linear expansion of the material of the tape were 0.00, 00112 degree centigrade, then the error, due to temperature, per tape length would be

ANS:D - - 0.00, 16800 m

Here it is behaviour as a short chain because temperature decrease than standard temp. In short chain error will be positive and correction will be negative so option A and D is wrong.

Because the questions asks Error due to temperature not correction. Per tape length not per 1m tape length. So C is correct.