Correct Answer - Option 1 : 37.5°C
CONCEPT:
Measurement of temperature:
- The instrument used for the measurement of temperature is called a thermometer.
- All thermometers are based on the fact that matter expands on heating.
CALCULATION:
At 0°C the thermometer reading is -15°C.
At 100°C the thermometer reading is 90°C.
- We know that for the thermometer,
\(⇒ \frac{90-\left ( -15 \right )}{100-0}=\frac{T-\left ( -15 \right )}{50-0}\)
\(⇒ \frac{90+15}{100}=\frac{T+15}{50}\)
⇒ T = 37.5°C
Hence, option 1 is correct.