K.C.S.E Physics Q & A - MODEL 2008PP2QN10
A heating coil is rated 100W, 240V. At what rate would it dissipate energy if it is connected to a 220V supply?
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K.C.S.E Physics Q & A - MODEL 2008PP2QN09
​Figure 6 shows a circuit in which a battery of negligible internal resistance, two resistors, a capacitor, a voltmeter and a switch are connected.
Giving a reason for your answer in each case, state the reading of the voltammeter, V, when the switch is
(i) Open V=………………………… Reason………………… (ii) Closed V=………………………… Reason………………. K.C.S.E Physics Q & A - MODEL 2008PP2QN08
​Figure 5 shows wavefronts approaching the boundary between two media.
​The speed of the waves in medium (2) is higher than that in medium (1). On the same diagram complete the figure to show the wavefronts after crossing the boundary.
K.C.S.E Physics Q & A - MODEL 2008PP2QN07
Figure 4 shows a hack-saw blade clamped horizontally on a bench and the free end is made to vibrate about the rest position.
​Determine the frequency of vibration of the blade.
K.C.S.E Physics Q & A - MODEL 2008PP2QN06
​ Figure 3 shows a flat spring made of iron clamped horizontally on the bench over a solenoid
When the switch is closed, the spring vibrates. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2008PP2QN05
​The diagram in figure 2 shows an object O placed in front of a converging lens. F and F are the principal foci for the lens.
The object is now moved along the principal axis until a virtual image is produced.
On the same diagram: (i) Draw the object O in the new position along the principal axis; (ii) Sketch rays to show formation of the virtual image K.C.S.E Physics Q & A - MODEL 2008PP2QN04
​ An un-magnetized steel rod is clamped facing North-South direction and then hammered repeatedly for some time. When tested, it is found to be magnetized. Explain this observation
answer
K.C.S.E Physics Q & A - MODEL 2008PP2QN03
​ You are provided with the following;
A cell and holder, a switch, a rheostat, an ammeter, a voltmeter and connecting wires. Draw a diagram for a circuit that could be used to investigate the variation of the potential difference across the cell with the current drawn from the cell. K.C.S.E Physics Q & A - MODEL 2008PP2QN02
A leaf electroscope A is charged and placed on the bench. Another uncharged leaf electroscope B is placed on the same bench and moved close to A until the caps touch. State and explain what is observed on the leaves of A and B.
answer
K.C.S.E Physics Q & A - MODEL 2008PP2QN01
​Figure 1 shows three point sources of light with an opaque object placed between them and the screen.
​Explain the nature of the shadow formed along B and C.
answer
BC - Total absence of light; umbra, completely dark
- Total darkness Rays are completed blocked from this region by the object K.C.S.E Physics Q & A - MODEL 2008PP1QN19
​ a) State the principle of moments.
b) A uniform metal strip is 3.0cm wide, 0.6cm thick d 100cm long. The density of the metal is 2.7 g/cm3. (i) Determine the weight of the strip. The strip placed n a pivot and kept in equilibrium by forces as shown in fig. 13
​(ii) Determine the value of F and R
(iii) X is the distance from the end of the plank to the point of application of force F. Force F is now applied at various points nearer to the pivot so that x increases. Equilibrium is maintained all the time. On the axes provided sketch the relation between force F and x.
​(iv) Give a reason for the answer in (iii) above
K.C.S.E Physics Q & A - MODEL 2008PP1QN18
​(a) Define the term velocity ratio of a machine.
(b) Fig. 12 shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m2 while the Ram piston has cross-section area, a m2.
When the plunger moves down a distance d the Ram piston moves up a distance D.
(i) State the property of liquid pressure on which the working of the hydraulic press works. (ii) Derive an impression for the velocity ratio (V.R) in terms of A and a. c) A machine of velocity ratio 45, overcomes a load of 4.5 x 103N when an effort of 135N is applied. Determine: (i) The mechanical advantage of the machine; (ii) Efficiency of the machine; (iii) The percentage of the work that goes to waste. K.C.S.E Physics Q & A - MODEL 2008PP1QN17
​a) What is meant by absolute zero temperature?
Fig. 10 shows a set up to investigate the relationship between temperature and volume for a certain gas.
b) State two factors that are kept constant, in order to determine the relationship.
c) The graph in Fig. 11 shows the relationship between volume and temperature for the experiment. (i) What was the volume of the gas at 00C?
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