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2.2 Thermal properties and temperature

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Question 72

This question is about temperature measurement and the design of thermometers.

a.

A thermocouple thermometer consists of two wires of different materials joined together to form two junctions, connected to a sensitive millivoltmeter.

Select the three correct statements about a thermocouple thermometer from the list below:

  1. The meter measures the electrical power output of the circuit.
  2. The meter measures the electromotive force (e.m.f.) or potential difference.
  3. The two wires are made from different materials.
  4. The two wires are made from the same material.
  5. The wires must be electrical conductors.
  6. The wires must be electrical insulators.
[3]
b.

A liquid-in-glass thermometer is modified by replacing its capillary tube with one that has a narrower bore (smaller internal cross-sectional area). No other changes are made.

State and explain the effect of this modification on the sensitivity of the thermometer.

[3]
c.

A liquid-in-glass thermometer is made with a manufacturing defect: the internal diameter of the capillary is not constant but decreases gradually from the bulb towards the top of the tube.

State and explain the effect of this defect on the linearity of the thermometer scale.

[3]
Markscheme

2.2 Thermal properties and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2 Thermal properties and temperature

528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.

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