O level Physics Temperature

A piece of wire has an electrical resistance of 980 Ω in ice of -10 °C, and 1750 Ω in boiling water at 100 °C. What is the resistance of the piece of wire at 30 °C, assuming resistance changes uniformly with temperature?

• 280 Ω

• 1190 Ω

• 1260 Ω

• 1370 Ω

A student puts the bulb of an unmarked liquid-in-glass thermometer into melting ice, steam and finally into sea-water. The diagram shows the liquid levels measured. What is the temperature of the sea-water?

• 2 °C

• 20 °C

• 33 °C

• 40 °C

Which of the following statements show a difference between heat and temperature?

• When 80 W of heat is supplied, the temperature reached 80 °C

• Heat has a SI unit in Kelvin while temperature SI unit is in °C

• Heat increases when temperature increases

• Heat remains constant regardless whether temperature changes

When a thermometer is calibrated, the fixed points are marked. What are fixed points?

• All the marks on the temperature scale which cannot be removed

• All the marks of the temperature scale

• The lowest and highest temperature shown on the thermometer

• Two temperatures of known value which are easily reproduced

The graph shows how the thermometric property of four substances changes with temperature. Which substance can be used to construct a temperature scale?

• A

• B

• C

• D

Which of the following is not one of the steps needed in the determination of ice point when calibrating a liquid-in-glass thermometer with the Celsius scale?

• Immerse the bulb and the lower part of the thermometer stem into a funnel containing pure melting ice

• Measure the temperature of the first few drops of melted ice which should be 0°C

• When the mercury level in the thermometer stem remains steady, mark that level as ice point on the stem

• All of the steps are needed

A liquid-in-glass thermometer has a mercury level of 3.0 cm at -5 °C and a mercury level of 11.0 cm at 115 °C. What is the mercury level when the temperature is 105 °C ?

• 8.3 cm

• 9.8 cm

• 10.1 cm

• 10.3 cm

A thermometer is used to measure a temperature of 80 °C. Which thermometer is the most sensitive?

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Which physical property is not suitable for defining temperature scales?

• e.m.f of a battery

• electrical resistance of a solid

• pressure of a gas

• volume of a liquid

The diagram shows a thermocouple connected to a galvanometer. However, the galvanometer does not show any deflection. Which of the following is not a possible reason for the observation?

• Wire 1 and wire 2 are made of the same material

• Wire 1 and wire 3 are made of the same material

• Both junctions P and Q have same temperature

• The galvanometer is not sensitive enough to detect the current