K.C.S.E Physics Q & A - MODEL 2019PP1QN05
​Figure 3 shows two metal rods A and B of equal length made of the same material but different diameters wax is attached at one end of each rod. A source of heat is placed between the two metal rods.
​State with a reason, what is observed on the wax.
answer
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K.C.S.E Physics Q & A - MODEL 2017PP1QN04
When a liquid is heated in a glass flask, it is observed that the level at first goes down and then rises. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2016PP1QN07
​Figure 5 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 aluminum expands more than steel for the same temperature rise.
answer
K.C.S.E Physics Q & A - MODEL 2016PP1QN06
Figure 2 shows a uniform light bar resting horizontally on corks floating on water in two beakers A and B.
​Explain why the bar tilts towards side A when equal amount of heat is supplied to each beaker
answer
K.C.S.E Physics Q & A - MODEL 2016PP1QN05
Fig. 3 shows a hot water bath with metal rods inserted through one of its sides. Some wax is fixed at the end of each rod. Use this information to answer question 5(a) and 5(b).
​What property of metals could be tested using this set-up?
answer
K.C.S.E Physics Q & A - MODEL 2015PP1QN12
​Figure 6 shows a glass tube with water fitted with two identical thermometers A and B.
It is heated as shown 
​State with a reason which one of the two thermometers shows a higher temperature.
ANSWER
K.C.S.E Physics Q & A - MODEL 2015PP1QN07
​Two containers A and B of equal dimensions but different metals are fitted with identical glass casings. The two containers initially at the same temperature 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.
ANSWER
K.C.S.E Physics Q & A - MODEL 2014PP1QN13
​Figure 8 shows a graph of the variation of temperature with time for a pure substance heated at a constant rate.
​Assuming that heat transfer to the surroundings is negligible, state the changes observed on the substance in region:
(a) BC; (b) DE.
answers
​(a) BC Solid changes to liquid
(b) DE Liquid changes to vapour K.C.S.E Physics Q & A - MODEL 2013PP1QN07
​Figure 3 shows a piece of wood fitted into a copper pipe and a piece of paper wrapped tightly around the junction.
​It is observed that when a flame is applied around the paper at the junction, the side of the paper around the wood burns first. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2012PP1QN13Figure 4 shows a graph of temperature against time when pure melting ice at 00 C is heated uniformly.
Explain what happens between parts:
(i) OA (ii) AB
answers
K.C.S.E Physics Q & A - MODEL 2012PP1QN05
​Figure 2 shows a flat bottomed flask containing some water. It is heated directly with a very hot flame.
​Explain why the flask is likely to crack.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN05
​Figure 4 shows two identical beakers P and Q full of water at 90°C. Two similar cold wet clothes are wrapped, one around the top of P and the other around the bottom of Q.
​State with a reason, the beaker in which the water cools faster.
ANSWER
K.C.S.E Physics Q & A - MODEL 2010PP1QN05
When a liquid is heated in a glass flask, its level at first falls, then rises. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2010PP1QN03
Some water in a tin can was boiled for some time. The tin can was then sealed and cooled. After some time it collapsed. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2009PP1QN11
​Figure 6 shows two inflated balloons hanging vertically on light threads
​When a stream of air is blown in the space between the balloons, they are observed to move towards each other. Explain this observations
ANSWER
K.C.S.E Physics Q & A - MODEL 2009PP1QN08Two identical empty metal containers P and Q are placed over identical Bunsen burners and the burners lit. P is dull black while Q is shiny bright. After each container attains a temperature of 1000C the burners are turned off. Identical test tubes containing water are suspended in each container without touching the sides as shown in figure 3
​Explain why the container Q may become hot faster than P.
Explain why the water in test- tube in P becomes hot faster than in Q
ANSWERS
K.C.S.E Physics Q & A - MODEL 2008PP1QN06&7
Fig. 3 shows a hot water bath with metal rods inserted through one of its sides. Some wax is fixed at the end of each rod. Use this information to answer questions 6 and 7.
​What property of metals could be tested using this set-up?
Besides the length of the rods that is kept constant, what else should be kept constant when comparing the property for the different metal rods?
answers
K.C.S.E Physics Q & A - MODEL 2008PP1QN05
​ Fig: 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, then falls steadily.
​Explain observation.
answer
K.C.S.E Physics Q & A - MODEL 2007PP1QN06&7
​Figure 4 show two identical balloons A and B. The balloons were filled with equal amounts of the same type of gas. The balloons are suspended at distances X1 and X2 from a metal cube filled with boiling water and placed on an insulating material. Use this information to answer questions 6 and 7.
​State the mode by which heat travels from the cube to the balloons
The face of the cube towards A. is bright and shiny and the face towards B is dull black. State with reason the adjustments that should be made on the distances X1 and X2 so that the rate of change of temperature in both balloons is the same.
answers
K.C.S.E Physics Q & A - MODEL 2006PP1QN04
​Figure 3 shows a bimetallic strip with a wooden handle, suspended horizontally using a thin thread.
​The strip is heated at the point shown. Explain why the system tips to the right
answer
K.C.S.E Physics Q & A - MODEL 2005PP1QN34
Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
ANSWER
K.C.S.E Physics Q & A - MODEL 2005PP1QN05
In a vacuum flask the walls enclosing the vacuum are silvered on the inside. State the reason for this.
answer
K.C.S.E Physics Q & A - MODEL 2004PP1QN06
​Two identical aluminium rods as shown in figure 4. One rests on metal block the other on the wooden Block. The protruding ends are heated on a Bunsen burners shown.
​State with reason on which bar the wax is likely to melt.
answer
K.C.S.E Physics Q & A - MODEL 2003PP1QN07
​When a Bunsen burner is lit below wire gauze, it is noted that the flame initially burns below the gauze as shown in Figure 5 (i).After sometime, the flame burns below as well as above the gauze as shown in Figure 5(ii).
Explain this observation
answer
K.C.S.E Physics Q & A - MODEL 2003PP1QN06
​In the set up shown in Figure 4, it is observed that the level of the water initially drops before starting to rise.
​Explain this observation
answer
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