0625_s16_qp_21
A paper of Physics, 0625
Questions:
40
Year:
2016
Paper:
2
Variant:
1
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12
A diver under water uses breathing apparatus at a depth where the pressure is 1.25 × 105 Pa. A bubble of gas breathed out by the diver has a volume of 20 cm3 when it is released. The bubble moves upwards to the surface of the water. At the surface of the water, the atmospheric pressure is 1.00 × 105 Pa. The temperature of the water is the same at all depths. What is the volume of this bubble when it reaches the surface?
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
1. Motion, forces and energy  →  1.8. Pressure
Open
17
A student wishes to check the upper and the lower fixed points on a Celsius scale thermometer. 110 °C –10 She has four beakers P, Q, R and S. Beaker P contains a mixture of ice and salt. Beaker Q contains a mixture of ice and water. Beaker R contains boiling salt solution. Beaker S contains boiling water. Which two beakers should she use to check the fixed points?
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
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18
Two otherwise identical cars, one black and one white, are at the same initial temperature. The cars are left in bright sunshine and their temperatures increase. During the night their temperatures decrease. Which car shows the greater rate of temperature increase and which car shows the greater rate of temperature decrease?
2. Thermal physics  →  2.3.3. Radiation
2. Thermal physics  →  2.3.4. Consequences of thermal energy transfer
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
Open