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Form 1 Physics Thermal Expansion Questions and Answers

In this session, we are going to solve Form 1 Physics questions on thermal expansions. Answers are in video format.

Lessons (23)

• 1.    One property of a liquid that is considered while constructing a liquid-in- glass thermometer is that the liquid expands more than the glass for the same temperature change. State any other two properties of the liquid that are considered.
  1m 48s

• 2.    Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature.
  0m 28s

• 3.    Explain why a glass container with thick walls is more likely to crack than one with a thin wall when a very hot liquid is poured into it.
  2m 54s

• 4.    Figure one shows a circuit diagram for controlling the temperature of a room. (i) State and explain the purpose of the bimetallic strip. (ii) Describe how the circuit controls the temperature when the switch S is closed.
  2m 55s

• 5.    Figure 10 shows a fire alarm circuit. Explain how the alarm functions
  0m 59s

• 6.    Figure 5 shows a bimetallic strip at room temperature. Brass expands more than invar when heated equally. Sketch the bimetallic strip after being cooled several degrees below room temperature.
  2m 23s

• 7.    Figure 4 shows a bimetallic strip. Explain how a rise in temperature causes the pointer to move in the direction shown.
  1m 12s

• 8.    Figure 5 shows a flask fitted with a glass tube dipped into a beaker containing water at room temperature. The cork fixing the glass tube to the flask is air tight. State what is observed when ice -cold water is poured on the flask
  1m 24s

• 9.    Figure 5 shows a flask fitted with a glass tube dipped into a beaker containing water at room temperature. The cork fixing the glass tube to the flask is air tight. Explain what is observed when ice -cold water is poured on the flask
  1m 12s

• 10.    The set up shown in figure 4, it is observed that the level of water initially dropped before starting to rise. Explain this observation
  1m 16s

• 11.    Give a reason why water is not a suitable liquid for use in a barometer
  0m 26s

• 12.    The temperature of water in a measuring cylinder is lowered from about #20^0C# to #0^0C# on the axes provided sketch the graph of the volume against temperature assuming the water does not freeze.
  2m 38s

• 13.    Figure 2 shows a flask filled with water. The flask is fitted with a cork through which a tube is inserted. When the flask is cooled, the water level rises slightly and then falls steadily. Explain this observation.
  1m 1s

• 14.    A clinical thermometer has a constriction in the bore just above the bulb. State the use of this constriction.
  0m 31s

• 15.    When a liquid is heated in a glass flask, its level at first falls then rises. Explain this observation.
  0m 29s

• 16.    Figure 3 shows an aluminium tube tightly stuck in a steel tube. Explain how the two tubes can be separated by applying a temperature change at the same junction given that aluminium expands more than steel for the same temperature.
  0m 56s

• 17.    Figure 2 shows a flat bottomed flask containing some water. It is heated directly with a very hot flame. Explain why flask is likely to crack.
  0m 41s

• 18.    In an experiment to investigate the unusual expansion of water, a fixed mass of water at #0^0C# was heated until its temperature reached #20^0C#. on the axis provided, sketch a graph of density against temperature of the water from #0^0C# to #20^0C#.
  2m 18s

• 19.    Two containers A and B of equal dimensions but different metals are fitted with identical glass casings. Two containers initially at the same temperatures are simultaneously filled with boiling water. It is observed that the glass casing on A breaks earlier than the one on B. explain this observation
  0m 52s

• 20.    Figure 2 shows a round bottomed flask fitted with along capillary tube containing a drop of coloured water. The flask is immersed in ice for some time. State the observation made.
  1m 15s

• 21.    Figure 3 shows a bimetallic strip after it was cooled below room temperature. Explain why the strip curved as shown.
  0m 35s

• 22.    Figure 2 shows a round bottomed flask containing a coloured liquid. The flak is fitted with the capillary tube. It is observed that on holding the flask with bare hands the level of the liquid in the capillary tube initially drops slightly and then rises. Explain this observation.
  1m 12s

• 23.    On the axis provided, sketch a graph which shows the relationship between volume and temperature of a fixed mass of water in the temperature range #0^0C# to #10^0C#.
  2m 5s