K.C.S.E Physics Q & A - MODEL 1998PP2QN01
.a) In an experiment to determine the strength of an electromagnet, the weight of pins that can be supported by the electromagnet, was recorded against the number of turns. The current was kept constant throughout the experiment. Table 1 shows the data obtained.
(i) Plot a graph of weigh, W (y-axis) against the number of turn's n
(ii) Use the domain theory to explain the nature of the curve. (iii) Sketch on the same axes, the curve that would be obtained using a higher current. b) Using a labeled diagram, explain the working of a simple relay.
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K.C.S.E Physics Q & A - MODEL 1998PP1QN34
Fig 12 shows a body of weight 50N placed on a surface which is inclined at an angle of 30 to the horizontal . The body experiences a maximum frictional force of 29N with the surface.
Determine the force required to move the body, up the inclined with constant velocity.
K.C.S.E Physics Q & A - MODEL 1998PP1QN32
Fig 11 shows a double slit placed in front of a source, s of waves, a director D is placed beyond the slits, such that its position can be adjusted along the line XY
State with a reason, what the detector records along XY.
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN25
Fig 7 shows a graph of pressure P, against volume, V, for a fixed mass of gas at constant temperature.
Sketch on the same axes a graph for the same mass of gas with a temperature T2 lower than T1
K.C.S.E Physics Q & A - MODEL 1998PP1QN21
In the circuit in fig 5 when the switch S is closed, the voltmeter shows a reading.
When the cell terminals are reversed and the switch is closed, the voltmeter reading is zero. Explain these observations.
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN20
Table 1 carries information on the type of radiation, detector and use for some of the electromagnetic radiations. Fill in the blanks.
answers
K.C.S.E Physics Q & A - MODEL 1998PP1QN19
State two differences between the cathode ray tube (CRT) of a TV and the cathode ray oscilloscope (CRO)
answers
K.C.S.E Physics Q & A - MODEL 1998PP1QN17
Calculate the length of a wire required to make a resistor of 0.5 ohms, if the receptivity of the material is 4.9 x 10-7 ohmmeter and the cross sectional area is 2.0 x 10-6cm-2
K.C.S.E Physics Q & A - MODEL 1998PP1QN13
State the reason why a voltmeter of high resistance is more accurate in measuring potential differences, that one of low resistance.
ANSWERS
K.C.S.E Physics Q & A - MODEL 1998PP1QN11
The internal resistance of the cell. E in figure 3 is 0.5 ohms.
Determine the ammeter reading when the switch S is closed. K.C.S.E Physics Q & A - MODEL 1998PP1QN08
The primary coils of a transformer has 2000 turns and carries a current of 3A. If the secondary coil is designed to carry a current of 30A, calculate the maximum number of turns in the secondary coil.
​K.C.S.E Physics Q & A - MODEL 1998PP1QN04
State one industrial use of X – rays
ANSWER
​K.C.S.E Physics Q & A - MODEL 1998PP1QN03
A heating coil rated 1000 W takes 15 minutes to heat 20kg of a liquid from 26°C of 42°C. Determine the specific heat capacity of the liquid.K.C.S.E Physics Q & A - MODEL 1997PP2QN07
a) i. Distinguish between transverse and longitudinal waves
ii. Give one example of a transverse and one example of longitudinal. b) Figure 6 shows the displacement of a particle in a progressive wave incident on a boundary between deep and shallow regions.
i. Complete the diagram to show what is observed after boundary. (assume no loss of energy)
ii. Explain the observation in (i) above. (c) Water waves are observed as they pass a fixed point at a rate of 30 crests per minute. A particular wave crest takes 2s to travel between two fixed points 6m apart. Determine for the wave: (a) The frequency (b) Wavelength (d) Figure 7 shows two loud speakers L1 and L2 connected to a signal generato
One observer walks along line 00'' and another line AA'' for some distance. Describe the observations made by each observer and give reasons for your answer
K.C.S.E Physics Q & A - MODEL 1997PP2QN05
(b) In the set up in figure 5, the suspended metre rule is in equilibrium balanced by the magnet and the weight shown. The iron core is fixed to the bench
(i) State and explain the effect on metre rule when the switch S is closed
(ii) What would be the effect of reversing the battery terminals (iii) Suggest how the set up in figure 5 can be adapted to measure the current flowing in the current circuit. (c) Electrons emitted from a metal when light of a certain frequency is shone on the metal are found to have a maximum energy of 8.0 x 10-19J. If the work function of the metal is 3.2 x 10-19J, determine the wavelength of the light used
K.C.S.E Physics Q & A - MODEL 1997PP2QN05
State two factors that affect the strength of an electromagnet.
ANSWERS
K.C.S.E Physics Q & A - MODEL 1997PP2QN04
Figure 4 shows a force- distance graph for a car being towed on a horizontal groun
(a) Calculate the total work done
(b) If the velocity just before reaching point D is 0.6ms-1, calculate the power developed by the agent providing the force at this point. (c) An electric pump can raise water from a low level reservoir to the higher – level reservoir at the rate of 3.0 x 105 kg per hour. The vertical height of the water raised 360m. If the rate of energy loss in form of heat is 200KW, determine the efficiency of the pump K.C.S.E Physics Q & A - MODEL 1997PP2QN03
(a) A stone is thrown vertically upwards from the edges of a platform. Eventually the stone lands without bouncing on the ground below the platform. Taking the upward velocity to be positive sketch on the axis provided the velocity time graph of the motion of the stone.
​(b) A car can be brought to rest from a speed of 20 ms-1 in a time of 2s
(i) Calculate the average deceleration (ii) If the driver's reaction time is 0.2s, determine the shortest stopping distance K.C.S.E Physics Q & A - MODEL 1997PP2QN01
Figure 1 shows a circuit diagram for controlling the temperature of a room.
​(i) State and explain the purpose of the Bimetallic strip
(ii) Describe how the circuit controls the temperature when the switch is closed (b) A drinking glass 0.02 kg contains 200gms of water at 20°C. A mass of 0.04 kg of ice at 00 C is dropped into the glass. Determine the final temperature of the mixture. Specific heat capacity of glass = 670kg1K1. (Give your answer to correct ne decimal place) K.C.S.E Physics Q & A - MODEL 1997PP1QN30
Figure 12 shows an experiment arrangement. S1 S2 and S are narrow slit
State what is observed on the screen when the source is?
(a) Monochromatic (b) White light
ANSWERS
(a) Dark and bright fringes
(b) Coloured fringes
K.C.S.E Physics Q & A - MODEL 1997PP1QN29
What is the value of -20°C on the absolute temperature scale?K.C.S.E Physics Q & A - MODEL 1997PP1QN28
Figure 11 shows part of a circuit containing three capacitors
Write an expression for CT the effective capacitance between A and B
K.C.S.E Physics Q & A - MODEL 1997PP1QN27
A trolley is moving at constant speed in a friction compensated track. Some plasticine is dropped on the trolley and sticks on it. State with a reason what is observed about the motion of the trolley.
ANSWERS
K.C.S.E Physics Q & A - MODEL 1997PP1QN24
Ice changes to water at 0°C. Equal masses of the ice and water at 0°C are each heated to 1°C. Give a reason why more heat energy is required to heat ice
ANSWERS
K.C.S.E Physics Q & A - MODEL 1997PP1QN21,22 &23
Using the information in figure 8 answer questions 21,22 and 23.
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