Kisii South 2012 Mocks

Confidential

CONFIDENTIAL
Question 1
Each  candidate to have the following apparatus

• A meter rule
• Venier calipers
• One 300g mass
• Two knife edges( Each 9cm hgh)
• Some thread(about 20 cm long)
  

Question 2
Each  candidate to have the following

• 7 connecting wires
• Bulb(2.5V)
• 2 new dry cells( Size D, 1.5V)
• Voltmeter(0-3V)
• Ammeter(0-2.5A)
• Switch
• Rheostat
• Glass prism(600-600-600)
• 4 optical pins
• Plain paper
• Protractor
• Some Plasticine
  

Questions

1.         You are provided with the following:
-           A metre rule
-           Vernier calipers
-           A 300g mass
-           Two knife edges
-           Some thread.
Proceed as follows:
a)   Place the metre rule on the knife edge such that each knife edge is 45 cm from the 50 cm mark
(centre of the rule). See figure 1. Ensure that the millimetre scale of the metre rule is facing upwards. The distance L between the knife edges is now 900 mm.
Place the vernier calipers vertically against the metre rule at the 50 cm mark with the depth gauge lowered to touch the bench as shown in figure 1.
Record the height h0, of the upper edge of the metre rule at the 50 cm mark. (See figure 1).

b)  Using the thread provided, hang the 300g mass at the 50cm mark of the metre rule. Ensure that the
mass does not touch the bench. Measure and record in table 1, the height h of the edge of the metre rule at the 50 cm mark.
c)  With the 300g mass still at the 50 cm mark, adjust the position of the knife edges so that L is now
800 mm. (The knife edges should be equidistant from the centre of the metre rule). Measure and record in table 1 the height h of the edge of the metre rule at the 50 cm mark.
d) Repeat the procedure in (c) for other values of L shown in table 1. Complete the table.

Note: Issue students with graph papers
e)         Plot a graph of Log L(y-axis) against log d.                                                   (5 marks)
f)         i) Determine the slope of the graph.                                                               (3 marks)

iii)        Determine G, the value of log L, when log d=0                     (2 marks)

2.         You are provided with the following apparatus
            -           7 connecting wires
            -           Bulb
            -           2 dry cells(1.5V)
            -           Voltmeter
            -           Ammeter
            -           Switch
            -           Rheostat
            i)          Set up the apparatus as in the figure below.

1.  Close switch S
   
2. Use rheostat to adjust your current I to 0.5A and record the corresponding values for the p.d across the bulb
   
3. Repeat the procedure for different values of current as shown in the table below.
   

v.)  Plot a graph of p.d(y-axis) against current I.                                                                                          (5 marks)
ii)  Determine the  resistance of the filament of the bulb when I=0.18A, given that Resistance R= V/I       (2 marks)
 You are provided with the following apparatus-           Prism

• 4 optical pins
• Plain paper
• Protractor
  
•  Some Plasticine
  

i)  Set up the apparatus as shown below

 i) Measure angle A of the  prism using a protractor A=                                                                (1 mark)
ii) Place the prism on a plain paper and  trace its outline with a pencil Attach  some Plasticine to the prism to indicate the refractive angle A
iii) Construct a normal at point T along  LM. Draw an incident ray to strike the prism at T at 600. Replace the prism and press pins P1 and P2  to define the incident ray. View the pins P1 and P2   from the opposite face(MN). Insert pins P3 and P4   so that they appear to be in line with  the images of P1 and P2 .
Remove the prism and join P3 and P4    to give the emergent ray.
Extrapolate the emergent ray into the prism so as to meet the extrapolated incident ray at Q.
                        iv)        a)         Measure angle D
                                                D=……………………………                                               (2 marks)

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