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232/3 Physics Question Paper

232/3 Physics

Course:Physics

Institution: Form 4 Mock question papers

Exam Year:2010

NAME…………………………………………….INDEX NO……………..…DATE…………
SCHOOL………………………………………………..SIGNATURE…………………………

232/3
PHYSICS
PRACTICAL
JULY/AUGUST 2010
2hr 30min

LAICOMET
Kenya Certificate of Secondary Education 2010

232/3
PHYSICS
Paper 3

INSTRUCTIONS TO CANDIDATES
? Answer ALL the questions in the spaces provided in the question paper.
? You are supposed to spend the first 15 min of the time given to go through the whole paper carefully before commencing your work.
? Marks are given for a clear record of the observations actually made, their suitability and accuracy, and the use made of them.
? Record the observations as soon as they are made. Mathematic tables, slide rules and electronic calculators may be used.

QUESTION

(iv)

Maximum Score

Candidate’s score

Q1 You are provided with the following apparatus:
- Two metre rules
- Two stands
- Two clamps
- Two bosses
- Three pieces of thread ( 1 metre , 30cm and 30cm)
- One optical pin
- A piece of cellotape
- A spring
- One 200g mass
- Stop watch
Set the apparatus as shown in fig1 attach the pin ( pointer on one end of the metre rule using cellotape)

- Suspend one end of the metre rule with a string at 5cm mark from the end.
- Suspend the other end with a spring also 5cm from the end so that the metre rule is horizontal. Hold the other metre rule vertically on the bench so that it is near the end with a pointer as shown in the figure above.

a) Read the pointer position Lo = cm (1mk)
Hang on the horizontal metre rule, the 200g mass at a length L=10cm from the spring. Record the extension of the spring in table 1 below
- Displace the mass slightly downward and release it to oscillate vertically, time for 20 oscillations.
- Record in the table the time for 20 oscillations
Repeat for other positions L of the mass.

b) Table 7mks
Length 10 20 30 40 50
L(cm) Extension (cm)

Time for 20 oscillations
Period time T(sec)

c) Plot the graph of extension (y- axis) against T2 on the grid paper provided (3mks)

GRAPH

d) Calculate gradient of the graph (3mks)

e) Given that
Determine the value of P (4mks)

2. You are provided with a metre rule , a lens holder,a concave lens, a candle,
and mounted white screen.

Proceed as follows:
i Set up the apparatus as shown in figure 2 above. (ensure that the candle and the lens are in the line)
ii) With the candle placed a distance L =100cm from the screen ,determine the position of a sharply focused magnified image of the candle on the screen by moving the lens
iii) Determine the distance of the lens to the candle U1=………………….cm (1mk)
iv) Now move the lens towards the screen until you get a sharply focused diminished image. Determine the new distance of the lens from the candle U2
U2 = …………………….cm (1mk)

v) Calculate the displacement of the lens (1mk)
d= U2 –U1 =……….cm

Given that , calculate the value of f (2mks)

b) With the same set up ensuring that L= 100cm adjust the lens until you get a sharp diminished image on the screen. Measure the object distance U and image distance V

i) Repeat the procedure withy L= 95cm, 90cm, 85cm, 80cm and 75cm each time recording the value of U and V and tabulating the results in the table II below. (5mks)
L (cm)

U (cm)
V (cm)

ii) Pot the graph of M against V (5mks)

GRAPH

iii) Determine the slope of the graph (3mks)

iv) Given that determine the focal length of the lens from the graph above (2mks)

232/3 Physics Question Paper

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