Temperature Measurement - Physics Questions and Answers

This set of Physics Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of Temperature”.

1. Temperature is absolute. True or False?
a) True
b) False
View Answer

Answer: b
Explanation: Temperature is a relative measure. When we touch a body we say it is hold or cold. We use devices like thermometers to indicate temperatures but we don’t have any fixed absolute value. When we say that temperature is 25°, it is relative to a reference we have decided like steam point and ice point.

2. What is the slope of line drawn for a graph between temperature in °C & °F?
a) 1.8
b) 5/9
c) slope is variable
d) 2
View Answer

Answer: a
Explanation: °F = (9/5)°C + 32.
Therefore from this we can say that slope of line drawn for graph between temperature in °C & °F is 9/5 = 1.8.

3. Why is mercury used in thermometers?
a) It volume is proportional to square of increase of temperature
b) It shows linear variation in volume with temperature
c) Its volume remains constant with temperature
d) Its volume decreases with increase in temperature
View Answer

Answer: b
Explanation: For measuring temperature in a thermometer we need a substance whose physical properties change with temperature and can be easily related with temperature. Mercury’s volume increases linearly with increase in temperature and hence we can create a scale on the thermometer accordingly.

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4. Temperature is 300K. Convert it into ℉.
a) 47°F
b) 80.6°F
c) 27°F
d) 16.6°F
View Answer

Answer: b
Explanation: Temperature in K = 273 + temp in °C.
∴ Temp in °C = 300-273 = 27
°F = (9/5) °C + 32
= (9/5)*27 + 32
= 80.6°F.

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