Instructions to candidates
- Write your name and admission number in the space provided above
- Answer all questions on the question paper
- You are supposed to spend the first 15 minutes allowed for this paper reading the whole paper carefully before commencing your work and confirming your apparatus.
- Marks are given for a clear record of the observations actually made, (or their suitability and accuracy and or the use made of them)
- Candidates are advised to record observations as soon as they are made.
- Mathematical tables or electrical calculators may be used
- Candidates should answer all the questions in English
QUESTION 1
You are provided with following apparatus
- A pendulum bob
- A cotton thread about1m long
- A retort stand and clamp
- A metre rule
- A stopwatch
- Two pieces of wood
- Vernier calipers(to be shared)
Proceed as follows
- Using the vernier calipers measure the diameter of the pendulum bob. (1mk)…………………………cm
- Clamp the pendulum as shown starting with L=80cm
- Give the bob a small displacement and record the time t for 20 complete oscillations. Record also periodic time T for one complete oscillation.
- Repeat the procedure above for values of L as shown in the table. Record and complete the table.(8marks)
Length L (cm) L (m) Time for 20 oscillations Period T (T2)(s2) 80 70 60 50 40 30 20 - Plot the graph of T2 against L(m)(5marks)
- Determine the slope of the graph(3marks)
- The equation for the graph is given by T2 = 4π2L/g where g is a constant. From the graph find the value of g.(2marks)
- What is the significance of g.(1mark)
QUESTION 2
APPARATUS
- concave mirror
- lens holder
- screen
- candle
- proceed as follows;
Figure 2
Procedure
- Set the apparatus as shown in figure 2
- Place the candle at a distance x=5.0 cm from the screen
- Move the mirror to and fro to focus a clear; sharp image of the candle on the screen
- Measure and record the distance u between the mirror and the candle and the distance v between the screen and the mirror.
- Repeat the experiment for other values of x and complete the table below (8MKS)
x (cm) 5.0 10.0 15.0 20.0 25.0 30.0 u (cm) v (cm) (u + v)(cm) uv (cm) - Draw a graph of ( u + v) cm against u v (cm) (5MKS)
- Determine the slope S of the graph 3mks ……………………………
- Using the value of S obtained above in (viii); determine the value of f, the focal length of the mirror, 2mks …………………
Given that R = 4f/s2 2mks……………………………………
CONFIDENTIAL
The teacher is required to provide each student with the following;
- concave mirror of focal length 10 ± 1 cm
- lens holder
- screen
- candle
- A pendulum bob
- A cotton thread about1m long
- A retort stand and clamp
- A metre rule
- A stopwatch
- Two pieces of wood
- Vernier calipers(to be shared)
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