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
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K.C.S.E Physics Q & A - MODEL 2013PP1QN05
State two measurements you would take in an experiment to determine the upthrust of an object which is immersed in a fluid.
State how the measurements in question (5) are used to determine the upthrust of the object.
answer
5. Weight of object in air
Weight of object when fully immersed in fluids 6. Upthrust = weight in air - weight of object in fluid. K.C.S.E Physics Q & A - MODEL 2013PP1QN04
An object of weight 20 N attached at the end of a spring causes an extension of 0.5 cm on the spring.
(a) Determine the spring constant of the spring. (b) Determine the weight of an object that would cause an extension of 0.86 cm when attached at the end of the same spring.
K.C.S.E Physics Q & A - MODEL 2013PP1QN02
State one factor that affects the turning effect of a force on a body.
answers
K.C.S.E Physics Q & A - MODEL 2013PP1QN01
Figure 1 shows part of the main scale and vernier scale of a vernier callipers.
Record the reading indicated.
answer
K.C.S.E Physics Q & A - MODEL 2012PP2QN017
(a) Figure 16, shows a graph of magnification against object distance, for an object placed infront of a lens of focal length 20cm.
Using the graph;
(î) State the effect on the size of the image as the object distance is increased from 25cm. (ii) Determine the distance between the object and the lens when the image is the same size as the object. (iii) Determine the image distance when the object distance is 25 cm. (b) Figure 17 shows an object O placed in front of a converging mirror of focal length 15cm.
Draw on the figure a ray diagram to locate the image formed.
(c) State why parabolic reflectors are used in car headlights. K.C.S.E Physics Q & A - MODEL 2012PP2QN11
Figure 10, shows the cross section of a conductor held between two magnets and carrying a current out of the paper.
Indicate with an arrow on the diagram the direction in which the conductor will move when it is released.
K.C.S.E Physics Q & A - MODEL 2012PP2QN10
Figure 9, shows the cross-section of an optical fibre made of two types of glass A and B. The refractive index of B is lower than that of A.
A ray of light enters the optical fibre at P and emerges from Q.
(i) Sketch the path of the ray through the fibre. (ii) State the reason why light travels through the fibre as in (i) above. K.C.S.E Physics Q & A - MODEL 2012PP2QN09
Figure 8, shows an object O placed infront of a diverging lens whose principal focus is F
On the figure, draw a ray diagram to locate the image formed.
K.C.S.E Physics Q & A - MODEL 2012PP2QN01
Figure 1, shows a plane mirror XY placed equidistant from two parallel lines AB and PT.
Four students stand at P, Q, R and T in front of the mirror
(a) Indicate the positions of the images of students at Q, R and T on line AB. (b) State which of the images are visible to the student standing at P. (c) Using rays indicate on the figure, how (b) above is possible. K.C.S.E Physics Q & A - MODEL 2012PP1QN14
(a) An aeroplane is moving horizontally through still air at a uniform speed. It is observed that when the speed of the plane is increased, its height above the ground increases.
State the reason for this observation. (b) Figure 5 shows parts A, B and C of a glass tube.
State with a reason the part of the tube in which the pressure will be lowest when air is blown through the tube from A towards C.
answers
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 2012PP1QN10
Table 1 shows the results of an experiment carried out to study the properties of a spring.
State with a reason whether the experiment was done within the elastic limit of the spring.
K.C.S.E Physics Q & A - MODEL 2012PP1QN09
State the reason why a steel sphere resting on a horizontal surface is said to be in neutral equilibrium.
ANSWER
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 2012PP1QN04
A bottle containing a smelling gas is opened at the front bench of a classroom.
State the reason why the gas is detected throughout the room.
ANSWER
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.
K.C.S.E Physics Q & A - MODEL 2011PP2QN16
(a) State the meaning of the term “principal focus” as applied in lenses.
(b) You are provided with the following apparatus to determine the focal length of a lens: - a biconvex lens and lens holder. - alit candle. - a white screen. - a metre rule
(i) Draw a diagram to show how you would arrange the above apparatus to determine the focal length of the lens
(ii) Describe the procedure you would follow. (iii) State two measurements that you would take. (iv) Explain how the measurements in (iii) would be used to determine the focal length. (c) An object is placed 30cm in front of a concave lens of focal length 20cm. Determine the magnification of the image produced.
answers
(a) The point at which rays close to and parallel to the principal axis converge or seem to diverge from after striking the lens;
(ii) Candle is placed at a certain distance from the lens. The distance between the screen and the lens is adjusted until a sharp image is focused on screen.
(iii) The distance of candle from lens (U) is measured; The distance of screen from lens (V) is also measured; K.C.S.E Physics Q & A - MODEL 2011PP2QN07&8
Figure 5, shows a motor connected to a magnetic switch called a relay operated by an ordinary switch S1 Use the information in the figure to answer questions 7 and 8.
Explain how the relay switches on the motor when S1 is closed.
State with a reason the effect on the motor, the iron core is replaced with a steel core and switch S1 is put on and then off.
ANSWERS
K.C.S.E Physics Q & A - MODEL 2011PP2QN06
One method of producing a weak magnet is to hold a steel rod in the North South direction and then hammer it continuously for some time. Using the domain theory of magnetism explain how this method works.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP2QN01
Figure 1, shows an object placed in front of a plane mirror.
Sketch the image of the object as seen in the mirror.
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 2011PP1QN10
State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces.
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 2011PP1QN04
Figure 3 shows an aluminum tube tightly stuck in a steel tube.
Explain how the two tubes can be separated by applying a temperature change at the junction given that aluminum expands more than steel for the same temperature rise.
ANSWER
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