2.2.1. Thermal expansion of solids, liquids and gases
A subsection of Physics, 0625, through 2. Thermal physics
Listing 10 of 61 questions
shows a liquid-in-glass thermometer. liquid ice point liquid –10 This thermometer is used for measuring temperatures in science experiments. State the unit for measuring temperature. On , an arrow points to the temperature reading when the thermometer is placed in pure melting ice. This is labelled ice point. On , draw an arrow pointing to the temperature reading when the thermometer is at the upper fixed point. Label this arrow steam point. A liquid-in-glass thermometer uses the property of expansion of a liquid to measure temperature. State one other application or consequence of thermal expansion. A student is testing how different surfaces absorb radiant heat. The student puts two metal plates in holders and places them on either side of a radiant heater as shown in . One plate has a shiny metal side facing towards the heater and the other plate has a dull black side facing towards the heater. A metal disc is attached to each plate using wax. 8 cm 10 cm wax metal disc wax metal disc dull black surface radiant heater shiny metal surface The student turns on the radiant heater and starts a stop-clock. The wax on the plate with a dull black side melts and the metal disc falls off the plate 53 seconds after the stop-clock is started. The metal disc on the plate with a shiny metal side remains attached for another 32 seconds after the metal disc on the first plate falls. Explain why the metal disc on the plate with a dull black side falls before the metal disc on the plate with a shiny metal side. Another student observes the experiment shown in and says that the comparison of the two plates is not fair. Suggest why the experiment is not fair.
0625_s20_qp_31
THEORY
2020
Paper 3, Variant 1
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For a special parade, the guest of honour is to sit on a chair whilst the parade passes by. Unfortunately the ground beneath the chair is soft, so the parade organisers put the chair on a large flat board, as shown in . Explain why the board prevents the chair from sinking into the ground. At the parade, some air-filled balloons are used as decorations, as shown in . State what happens to the balloons when the Sun makes them hotter. In terms of molecules, explain your answer to . chair board soft ground Use A pump is used to pump up the balloons in . A valve in the pump becomes blocked, as shown in . The piston of the pump is pushed in. State what happens to the pressure of the air trapped in the pump. In terms of molecules, explain your answer to . blocked valve air piston direction of motion of piston Examiner's Use
0625_s06_qp_2
THEORY
2006
Paper 2, Variant 0
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A student has a block of solid metal at room temperature. Describe the arrangement, separation and motion of the particles in the solid metal. The student cools the block of metal in a freezer. State the effect, if any, of cooling on the kinetic energy of the particles in the block of metal. State the name of the temperature at which particles have the least kinetic energy. State the value of temperature at which particles have the least kinetic energy. Include the unit. The metal block emits thermal radiation from its surface. State two features of a surface that is a good emitter of thermal radiation.
0625_s23_qp_32
THEORY
2023
Paper 3, Variant 2
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shows a metal block at room temperature on a table. metal block table Describe the arrangement, separation and motion of the particles in the metal block. The temperature of the metal block decreases. Describe any changes in the motion and separation of the particles in the metal block. A scientist cools the metal block until its temperature is close to absolute zero. Describe the motion of the particles in the metal block. The weight of the metal block is 26 N. The area of the metal block in contact with the table is 42 cm2. Calculate the pressure on the table due to the metal block. pressure = N / cm2
0625_s24_qp_32
THEORY
2024
Paper 3, Variant 2
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Questions Discovered
61