Two objects made of the same material and having the same mass are heated to a temperature of 35 degrees Centigrade above that of the atmosphere and then allowed to cool in still air for 30 minutes. State one factor that will determine their final temperature (1mk)Surface area to volume ratio
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State one factor that a bimetallic strip relies on for its workingDifference in expansion rates of materials
K.C.S.E Physics Q & A - MODEL 2019PP1QN04
​Figure 2 shows a round bottomed flask containing a coloured liquid. The flask is fitted with a 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.
answer
K.C.S.E Physics Q & A - MODEL 2018PP1QN06
​Figure 3 shows the shape of a bimetallic strip after it was cooled below room temperature.
​Explain why the strip curved as shown.
answer
K.C.S.E Physics Q & A - MODEL 2017PP1QN09
​Figure 2 shows a round bottomed flask fitted with a long capillary tube containing a drop of coloured water.
​The flask is immersed in ice water for sometime. State the observation made.
answer
K.C.S.E Physics Q & A - MODEL 2015PP1QN10
​A balloon is filled with hydrogen gas and then released into the air. It is observed that as it rises higher into the air it expands. Explain why it expands.
ANSWER
​K.C.S.E Physics Q & A - MODEL 2013PP1QN12
State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator.
answer
K.C.S.E Physics Q & A - MODEL 2011PP1QN04
​Figure 3 shows an aluminum tube tightly stuck in a steel tube.
​Explain how the two tubes can be separated by applying a temperature change at the junction given that aluminum expands more than steel for the same temperature rise.
ANSWER
K.C.S.E Physics Q & A - MODEL 2009PP1QN07
A clinical thermometer has a constriction in the bore just above the bulb. State the use of this constriction.
ANSWER
K.C.S.E Physics Q & A - MODEL 2000PP1QN07
​Fig. 4 shows a bimetallic thermometer.
​Explain how a rise in temperature causes the pointer to move in the direction shown.
ANSWER
K.C.S.E Physics Q & A - MODEL 1999PP1QN06
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.
ANSWER
K.C.S.E Physics Q & A - MODEL 1996PP1QN06
Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature
answers
K.C.S.E Physics Q & A - MODEL 1995PP1QN34
State two variables that must be controlled in an experiment for comparing the thermal conductivities of different metal rods of the same diameter
ANSWERS
One property of a liquid that is considered while construction 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 liquids that are considered (2 mks)
KNEC ANSWERS
1. 1995 Q8 P1
One property of a liquid that is considered while construction 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 liquids that are considered (2 marks) 2. 1995 Q34 P1 State two variables that must be controlled in an experiment for comparing the thermal conductivity of different metal rods of the same diameter (2 marks) 3. 1996 Q6 P1 Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature ( 2 marks) |
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M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses
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