The graph between two temperature scales A and B is shown in Fig. 11.1. Between upper fixed point and lower fixed point there are 150 equal division on scale A and 100 on scale B. The relationship for conversion between the two scales is given by


As we know the identity by which temperature on one scale can be converted into another scale i.e.

where LFP & UFP stands for Lower fixed point & upper fixed point respectively.


Now from above graph we can say Lower fixed point is



and Upper fixed point


Hence applying the above formula for A and B


i.e.



Therefore option (b) is correct.

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