K.C.S.E Physics Q & A - MODEL 1997PP2QN05
State two factors that affect the strength of an electromagnet.
ANSWERS
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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 1997PP2QN02
(a) Figure 2 shows a uniform plank 20 m long, weighing 400N resting on two supports A and B 9cm apart. A person weighing 600N walks towards B starting at
The data in the table below represents the upward force FA exerted at A as a function of distance, d. The distance d is measured from A
(i) On the grid provided plot a graph of FA ( y – axis) against the distance d
(ii) From the graph determine how far beyond point B, the person can walk before the plank tips (b) In the set up in the figure 3, the metre rule is in equilibrium
Given that the metre rule is uniform, determine its weigh
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 1997PP1QN34
A lithium atom has 3 protons in its nucleus. Complete the diagram in figure 14 by marking X in the appropriate shells show the electron distribution when the atom is not excited
In a sample there are 5.12 x 1020 atoms of krypton – 92 initially. If the half of krypton; 92 is 3.0s determine the number of atoms that will have decayed after 6s.
K.C.S.E Physics Q & A - MODEL 1997PP1QN33
State how eddy currents are reduced in a transformer
ANSWERS
K.C.S.E Physics Q & A - MODEL 1997PP1QN32
Using the components symbols shown in figure 14, sketch a series circuit diagram for a forward biased diode
K.C.S.E Physics Q & A - MODEL 1997PP1QN31
Two turning forks are sounded together. What is the condition for the beats to be heard?
ANSWER
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 1997PP1QN26
Figure 10 shows the apparent position of a fly in air as seen by a fish in wate
Sketch on the same diagram rays to show the actual position of the fly
K.C.S.E Physics Q & A - MODEL 1997PP1QN25
Figure 9 shows two parallel rays incident on a concave mirror. F is the focal point of the mirror
Sketch on the same diagram the path of the rays after striking the mirror
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.
Calculate the wavelength of the KBC FM radio wave transmitted at a frequency of 95.6 Mega Hertz.6/7/2020
K.C.S.E Physics Q & A - MODEL 1997PP1QN20
Calculate the wavelength of the KBC FM radio wave transmitted at a frequency of 95.6 Mega Hertz.K.C.S.E Physics Q & A - MODEL 1997PP1QN19
An object dropped from a height h attains a velocity of 6 ms-1 just before hitting the ground. Find the value of h.
K.C.S.E Physics Q & A - MODEL 1997PP1QN18
A transformer in a welding machine supplies 6 volts from a 240V main supply. If the current used in the welding is 30A. Determine the current in at the mains.
K.C.S.E Physics Q & A - MODEL 1997PP1QN17
Water flows in a horizontal smooth pipe. State the changes that would be observed in the nature of the flow if the speed of the water is steadily increased from low to a high value
answers
K.C.S.E Physics Q & A - MODEL 1997PP1QN16
An observer watching a fireworks displays sees the light from an explosion and hears the sound 2 seconds later. How far was the explosion from the observer?
answers
K.C.S.E Physics Q & A - MODEL 1997PP1QN15
Figure 7 shows an incomplete circuit of an electromagnet. Complete the circuit between X and Y drawing the windings on the two arms of the core such that A and B are both North poles when switch S is closed. Indicate the direction of the current on the windings drawn.
K.C.S.E Physics Q & A - MODEL 1997PP1QN14
A current of 0.5A flows in a circuit. Determine the quantity of charge that crosses a point in 4 minutes.
answer
K.C.S.E Physics Q & A - MODEL 1997PP1QN13
Distinguish between soft and hard magnetic materials
answers
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