A student holds a sheet of paper at an end so that it hangs in the position A as shown below17/10/2021 Explain why the paper rises to the position B when the student blows air in the direction shown by the arrow (2mks)There is pressure difference created as a result of air blown above the paper i.e. high velocity , low pressure
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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
The figure below shows a sheet of material with the shape of an isosceles triangle. Mark its centre of gravity accurately showing how you arrive at the answer (1mk)A turning effect of force depends on the magnitude of the force. State two other factors that determines the moment of a force (2mks)
A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation (2mks)
The continuously moving water molecules hit the crystal from all directions causing it to split into the tiny particles of which it consist. The same movement caused the particles to diffuse to all parts of the liquid, this rendering the whole volume colored.
Define crystal cleavage (1mk)This is the phenomenon in which crystals break/fracture along specific planes to yield fresh smooth surface when hit or subjected to mechanical shock
(a) Mark accurately the point in liquid L2 that is at the same pressure as point P (1mk)
AT the same level as O in the right limb
(b) Determine the number of times L1 is denser than L2 (2mks)
The bob in the figure above is deflected then released to oscillate. State and explain one factor that will determine whether the string breaks or not (2mks)
Mark on the diagram and name one other force acting on the bob.An object weighs 2.6 N in air and 2.2N when completely immersed in water. Determine the relative density of the object (2mks)SolutionComplete the figure below to show how a single pulley can be arranged to a velocity ratio(V.R) of 2 (2mks)
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(a) Explain how this movement can be observed (1mk)
By strongly illuminating a suspension of pollen grains in water/dust particles in air or smoke cell
(b) State in full, the law of motion that governs movement from x to z (1mk)
A body continues in its state of rest or motion with uniform velocity unless acted upon by an external force
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 2019PP2QN19
ā(a) Define half life as used in radioactivity.
(b) Figure 13 shows a device used to detect radioactivity by forming tracks when air is ionised. (i) State the name of the device shown.
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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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