K.C.S.E Physics Q & A - MODEL 2017PP2QN06
​Figure 1 shows an insulated wire wound on a U-shaped iron core connected to a battery.
​Determine the polarity of A.
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K.C.S.E Physics Q & A - MODEL 2017PP2QN05
State two advantages of using convex mirrors to monitor movements in a large supermarket.
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K.C.S.E Physics Q & A - MODEL 2017PP2QN04
State what is meant by polarisation in simple cells.
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K.C.S.E Physics Q & A - MODEL 2017PP2QN03
State one use of echoes.
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K.C.S.E Physics Q & A - MODEL 2017PP2QN02
​In a laboratory there are four metals — tin, nickel, copper and cobalt. Of these metals, name the metals that are;
(a) magnetic. (b) non-magnetic.
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K.C.S.E Physics Q & A - MODEL 2017PP2QN01
.State any two uses of microwaves.
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K.C.S.E Physics Q & A - MODEL 2017PP1QN18
(a) Figure 8 shows part of a hydraulic brake system.
​Describe how the systems works.
(b) State three conditions necessary for a driver to negotiate a bend on a flat level road at a relatively high speed. (c) Figure 9 shows two identical cans U and V each with a small opening at the top. Different amounts of water were put into the cans and heated until the water started to boil.
​Explain what will be observed when both cans are then suddenly dipped into a cold water bath.
answers
(a) (i) The driver applies a force on the pedal.
This force transmits pressure the master cylinder fluid. Equal pressure is transmitted to the wheel cylinder causing the pistons of the wheel cylinder to push brake shoe hence Pressing the brake pads that in turn press the wheel reducing its rotation. When the applied force is removed, the return spring pulls back the shoe and pistons to the original position. (b) Higher friction (wider tyres, rougher road) Lower radius Higher mass (c) U is observed to crush. It has more steam which when cooled creates a greater vacuum hence pressure causes collapsing. K.C.S.E Physics Q & A - MODEL 2017PP1QN17
​(a) State the law of flotation.
(b) Figure 6 shows two solids W and X made of the same material and immersed in water.
​(i) State with a reason which one of the containers experiences a greater upthrust.
(ii) Solid W weighs 12 N in air, 2 N ¡n water and 4 N in another liquid. Determine the density of the other liquid. (c) Figure 7 shows two identical wooden blocks each of mass 0.2 kg suspended in water by two strings M and N.
​Given that the upthrust on each block is 3.2 N, determine the tension in string;
(i) M, (ii) N. (d) State any one application of hydrometers. K.C.S.E Physics Q & A - MODEL 2017PP1QN16
​(a) In an experiment to determine the size of an oil molecule, oil is placed on the surface of water after sprinkling lycopodium powder on it.
(i) State two reasons why oil is used. (ii) State the function of the lycopodium powder. (iii) State any two assumptions that are made in this experiment. (iv) Explain why the oil spreads on the surface of water. (b) The following data was obtained from an experiment to determine the size of a palm oil molecule.
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