PHYSICS FORM 1 ONLINE TESTS SERIES MATTER, THERMAL EXPANSION AND HEATING 1. Evaporation occurs when molecules escape from a liquid surface into the air above it. During this process the temperature of the liquid falls. Why does the temperature of the liquid fall? A. The molecules in the vapour expand because the pressure is less. B. The molecules left in the liquid have more space to move around. C. The molecules move more slowly when they escape into the air. D. The molecules with the highest energies escape into the air. 2. A thermometer bulb is covered by a piece of damp absorbent cloth Air at room temperature is blown across the damp cloth. What happens to the thermometer reading? A. It remains constant B. It rises. C. It rises then falls D. It falls 3. Some air is trapped inside a small balloon. The average kinetic energy of the air molecules in the balloon is increased. What remains the same? A. the density of the air in the balloon B. the mass of the air in the balloon C. the temperature of the air in the balloon D. the volume of the air in the balloon 4. When ice melts to become water, which force must be overcome A. the attraction between electrons and the nucleus B. the attraction between the atoms in a molecule C. the force between molecules D. the force of gravity 5. To mark the lower fixed point of a Celsius scale on a thermometer, the thermometer should be placed in A. pure alcohol. B. pure distilled water C. pure melting ice. D. pure mercury. 6. At regular intervals along a railway line there is a gap between the rail sections. What is the reason for the gap between the rail sections? A. to allow for expansion of the rail sections during hot weather B. to allow for vibrations of the rail sections as the train passes over them C. to allow rain water to drain from the rail sections D. to keep the wheels of the train and carriages on the rail sections 7. The diagram shows a liquid-in-glass thermometer At 0 °C, the length of the liquid column is 2.0 cm. At 100 °C, the length of the liquid column is 22.0 cm. What is the length of the liquid column at 40 °C? A. 6.ocm B. 8.0cm C. 8.8cm D. 10.0 cm 8. The diagram shows a liquid-in-glass thermometer At 0 0C, the length of the liquid column is 2.0 cm. At 100 0C, the length of the liquid column is 22.0 cm. What is the length of the liquid column at 40 0C? 6.0cm 8.0cm 8.8cm 10.0 9. To mark the lower fixed point of a Celsius scale on a thermometer, the thermometer should be placed in A. pure alcohol. B. pure distilled water C. pure melting ice. D. pure mercury. 10. A glass beaker contains water. When the centre of the base of the beaker is heated, a convection current is set up. Which statement explains this? A. The evaporation of water causes water molecules to rise to the surface B. The expansion of water molecules causes them to rise to the surface. C. The water above the heat source rises because it becomes less dense. D. The water will rise below and become dense 11. Two identical copper cans are filled with boiling water. One can is insulated with wool. The temperature of the water in each can is taken every minute for several minutes. Graphs of the results are plotted. Which graph shows the results obtained? A B C D 12. The diagram shows a cooling unit in a refrigerator Why is the cooling unit placed at the top? A. Cold air falls and warm air is displaced upwards B. Cold air is a bad conductor so heat is not conducted into the refrigerator C. Cold air is a good conductor so heat is conducted out of the refrigerator. D. Cold air remains at the top and so prevents convection. 13. The diagram shows an electric heater being used to heat a beaker of water and an identical beaker of oil for several minutes The temperature of the water and the temperature of the oil increase constantly.The rise in temperature of the oil is much greater than that of the water.Why is this? A. The oil has a higher boiling point than water. B. The oil has a higher thermal capacity than water. C. The oil has a lower boiling point than water. D. The oil has a lower thermal capacity than water. 14. The diagram shows the cross-section of a vacuum flask containing a hot liquid in a cold room. X and Y are points on the inside surfaces of the walls of the flask. How is thermal energy transferred between X and Y? A. by conduction and convection B. by conduction only C. by radiation and convection D. by radiation only 15. In a vacuum flask, which methods of heat transfer are prevented by the vacuum? A. conduction only B. convection only C. conduction and convection only D. conduction, convection, and radiation 16. In a vacuum flask, which methods of heat transfer are prevented by the vacuum? A. conduction only B. convection only C. conduction and convection only D. conduction, convection, and radiation 17. What does the Kinetic Theory of Gases describe? A. Small numbers of small particles in constant random motion B. Large numbers of small particles in constant random motion C. Large numbers of small particles in an accelerating random motion D. Large numbers of large particles in constant random motion 18. What does the kinetic energy of the particles in a system depend on? A. Temperature of the system B.How quickly the particles are accelerating C.Charge of particle D.None of the above 19. As a substance changes state from a liquid to a gas, the amount of energy the particles have … A. decreases B. increases C. stays the same D. varies 20. The particles in the system are always in what kind of motion? A. Constant, random and rapid B.Static C.Slow and random D.Fast and follow a curved path Loading … Question 1 of 20
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