K.C.S.E Physics Q & A - MODEL 1998PP1QN24
John carried a uniform post of mass 20kg horizontally on his shoulder as shown in fig 6. He placed the post on his shoulder such that the centre of gravity of the pole is 1.0m behind him. He balanced the post by applying a downward force F at a point 0.5m on the part of the post in front of him.
Determine the value of the force F.
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K.C.S.E Physics Q & A - MODEL 1998PP1QN14
Explain how hammering demagnetizes a magnet
ANSWERS
K.C.S.E Physics Q & A - MODEL 1998PP1QN09
Water of mass 3kg at a temperature of 90°C is allowed to cool for 10 minutes.
State tow factors other than humidity. that determine the final temperature.
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN06
Figure 2 draw to scale shows a lens L1 placed 30cm fro an object O. The image is formed on the screen S 50cm from the lens.
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 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 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 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
K.C.S.E Physics Q & A - MODEL 1997PP1QN12
Figure 6 shows a beam AB supported at points A and B. A large F is applied on the beam as shown. Mark on the diagram, the position X, where a notch is likely to appear.
K.C.S.E Physics Q & A - MODEL 1997PP1QN10
Figure 4 shows two point objects A, and B, placed in front of a mirror M
Sketch a ray diagram to show the positions of their images as seen by the eye.
answers
K.C.S.E Physics Q & A - MODEL 1997PP1QN08
State the reason why water spilled on a glass surface wets the surface
answers
K.C.S.E Physics Q & A - MODEL 1997PP1QN07
Explain why a glass container with thick walls is more likely to crack than one with a thin wall when a very hot liquid is poured into them.
answers
K.C.S.E Physics Q & A - MODEL 1997PP1QN06The number of molecules in 18cm3 of a liquid is 6 x 1023. Assuming that the diameter of the molecules is equivalent to the side of a cube having the same volume as the molecule. Determine the diameter of the molecule.K.C.S.E Physics Q & A - MODEL 1996PP2QN02
(a) Given a bar magnet, an iron bar and a string
(i) Describe a simple experiment to distinguish between the magnet and the iron bar (ii) State with reasons the observation that would be made in the experiment (b) In an experiment to magnetize two substances P and Q using electric current, two curves ( graphs) were obtained as shown in figure
Using the information in Fig 1 explain the difference between the substances P and Q with references to the domain theory
answers
(a) (i) Each bar is suspended at a time using the string;
The suspended bar is allowed to rest; Its orientation is observed and recorded; This is repeated several times for confirmation (ii) The bar magnet settles in the N – S specific direction, due to its Interaction (l) with magnetic field of the earth (l) The iron bar settles in any direction; (l) because it does not have a magnetic field to the interact with that of the earth; (l) (b) P and Q are magnetized to the same level, by applying two different (l) current lp and lq such that lq > lp (l) Thus Q requires greater magnetizing power, (l) since its domains are more difficult to align; (l) P is easier to magnetize, since its (l) domain are more easily aligned: K.C.S.E Physics Q & A - MODEL 1996PP1QN38
Figure 8 shows an object O placed in front of a concave lens with principal foci F and F Construct a ray diagram to locate the position of the image
ANSWERS
K.C.S.E Physics Q & A - MODEL 1996PP1QN37
In the Brownian motion experiment, smoke particles are observed to move randomly. Explain how this motion is caused
ANSWERS
K.C.S.E Physics Q & A - MODEL 1996PP1QN30
The moment of the weight of vertical door does not significantly affect the moment of the force required to open the door. Give a reason for this
ANSWERS
K.C.S.E Physics Q & A - MODEL 1996PP1QN28
An observer A is in a moving vehicle with a siren on while an observer B is stationary on the side of the road. State the difference between the sound heard by A and B as the vehicle approaches B at a high constant speed
ANSWERS
K.C.S.E Physics Q & A - MODEL 1996PP1QN23
A small object lies at the bottom of a water pond at a depth of 1.2 m. Given that the refractive index of water is 1.3, determine the apparent dept of the object. (Give your answers to 1 decimal place)
K.C.S.E Physics Q & A - MODEL 1996PP1QN22
A lady holds a large concave of facal length 1 m, 80 cm from her face, state two characteristics of her image in the mirror
ANSWERS
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