Four mercury-in-glass thermometers are made with different dimensions. bore length Which will have the greatest sensitivity?

5054_s05_qp_1

MCQ

2005

Paper 1, Variant 0

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Which thermometer is the best for measuring rapidly-changing temperatures?

5054_s06_qp_1

MCQ

2006

Paper 1, Variant 0

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The diagrams show a bimetallic strip when it is at room temperature and after it has been cooled. brass invar brass invar below room temperature at room temperature The change in shape occurs because A brass contracts more than invar. B brass expands when it cools down. C invar and brass contract by equal amounts. D invar contracts more than brass.

5054_s06_qp_1

MCQ

2006

Paper 1, Variant 0

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A thermocouple thermometer uses a voltmeter to measure the e.m.f. generated between two junctions. The junctions are at temperatures t1 and t2. To calibrate the thermometer, fixed points are needed. V t1 t2 What are the values of t1 and t2 when the thermometer is calibrated at the steam point?

5054_s07_qp_1

MCQ

2007

Paper 1, Variant 0

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Use shows a thermometer. -10 °C Explain how to calibrate a thermometer. State the range of the thermometer in . State how you know that the scale of the thermometer in is linear. shows a thermometer which is more sensitive than the thermometer in . Only 0 °C is marked on this new thermometer. On , draw the temperature markings for 10 °C and 20 °C. °C

5054_s07_qp_2

THEORY

2007

Paper 2, Variant 0

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Liquid air contains a mixture of oxygen and nitrogen. The boiling point of nitrogen is –196 °C and the boiling point of oxygen is –183 °C. A sample of liquid air in a beaker is allowed to warm up slowly. shows how the reading of a thermometer in the beaker varies with time t. -200 temperature / C t / min -190 -180 Describe the two changes of state that occur and state when they occur. The liquid air contains 200 g of liquid oxygen and 800 g of liquid nitrogen. The specific heat capacity of liquid oxygen is 1.7 J / (g °C) and the specific heat capacity of liquid nitrogen is 2.0 J / (g °C). Calculate the thermal energy needed to warm the liquid from –205 °C to −196 °C. State the formula that you use in your calculation. energy =

5054_s08_qp_2

THEORY

2008

Paper 2, Variant 0

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What makes a liquid-in-glass thermometer sensitive to a small change of temperature?

5054_s09_qp_1

MCQ

2009

Paper 1, Variant 0

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What happens when a metal bar is heated?

5054_s09_qp_1

MCQ

2009

Paper 1, Variant 0

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shows a laboratory thermometer. °C –10 State the range of the thermometer. State one change in the design of the thermometer to increase its range. Describe how the behaviour of a more sensitive thermometer is different from a less sensitive thermometer. State one change in the design of the thermometer to make it more sensitive. Describe how a clinical thermometer differs from a laboratory thermometer. A diagram may be included in your answer. In the space below, draw a labelled diagram of a thermocouple thermometer. State two reasons why a thermocouple thermometer is sometimes a better choice than a laboratory thermometer. shows a copper block of mass 1.8 kg with two holes in the top. An 80 W heater is placed in one hole and a thermometer in the other. heater copper block thermometer The heater is switched on for 5.0 minutes. Assume that no energy is lost from the block. Calculate the energy supplied to the block. energy supplied = The specific heat capacity of copper is 390 J / (kg °C). Calculate the rise in temperature of the block. temperature rise =

5054_s10_qp_21

THEORY

2010

Paper 2, Variant 1

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A balloon filled with air is gently heated. What happens to the mass and the density of the air inside the balloon?

5054_s11_qp_11

MCQ

2011

Paper 1, Variant 1

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