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Question

The temperature of an iron piece is increased from 30 C to 90 C. Find the change in its temperature on the Fahrenheit scale and on the Kelvin scale.

A
108 F,60 K
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B
132 F,60 K
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C
108 F,32 K
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D
132 F,32 K
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Solution

The correct option is A 108 F,60 K
By using the formula,
C5=F329
We find the relation between change in temperature in Celsius scale and Fahrenheit scale as ΔTF=95ΔTC .......(1)
From the data given in the question, change in temperature measured in Celsius scale is given by
ΔTC=90 C30 C=60 C .......(2)

Using (2) in (1),
ΔTF=95ΔTC=95(60 C)=108 F
Relation between Celsius and Kelvin scale is given by C=K273
Using this, we find the relation between the change in temperature measured in Celsius scale and Kelvin scale as
ΔTK=ΔTC .......(3)

From (3), we can conclude that,
ΔTK=60 K
Hence, option (a) is the correct answer.

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