K.C.S.E Physics Q & A - MODEL 2012PP1QN01
Figure 1 shows a measuring cylinder containing some water.
​Determine the reading on the measuring cylinder, after three drops of water each of volume 0.6 cm3 are added.
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K.C.S.E Physics Q & A - MODEL 2011PP1QN019
​(a) State the condition necessary for a body to float in a fluid.
(b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water. Explain this observation. (c) Figure 17 shows three stages of an experiment to determine relative density of cork which normally floats on water. To make it sink, a sinker is hung below the cork.
​In (1) a spring balance is used to measure the weight W of the cork in air.
In (II) the spring balance is used to measure the apparent weight W1, when only the sinker is submerged in water. In (Ill) the spring balance is used to measure the apparent weight W2 when both the cork and the sinker are submerged. The following observations were made. W = 0.08N W = 0.60N W2 = 0.28N Use this information to determine the: (i) Upthrust on cork. (ii) relative density of cork. (d) Figure 18 shows parts of a simple submarine, a ship that can travel both on water and under water. To do this water is pumped in or out of the ballast tanks.
​Explain how the tanks are used to change the depth of the submarine.
K.C.S.E Physics Q & A - MODEL 2011PP1QN18
(a) Figure 15 shows a metal bolt which is threaded.​
Explain how a metre rule can be used to measure the pitch (distance between adjacent peaks) of the threading.
(b) Figure 16 shows a screw jack whose screw has a pitch of 1mm, and has a handle of 25 cm long.
Determine the velocity ratio of the jack.
(c) A bullet of mass 60g travelling at 800m/s hits a tree and penetrates a depth of 15 cm before coming to rest. (i) Explain how the energy of the bullet changes as it penetrates the tree. (ii) determine the average retarding force on the bullet. K.C.S.E Physics Q & A - MODEL 2011PP1QN17
​(a) When the temperature of water reaches the boiling point, bubbles rise to the surface.
(î) State what is contained in the bubbles. (ii) State the reason why bubbles rise to the surface only at the boiling point. (b) Figure 14 shows a graph of vapour pressure against the temperature of water vapour, in a laboratory where a mercury barometer indicates a height of 61.8 cm. (b) (i) Determine the atmospheric pressure in the laboratory in Nm-2.
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