Electricity Paper 2 Questions and Answers - Bunamfan Post Mock 2021 Exams

INSTRUCTIONS TO CANDIDATES
Candidates should have the following for this examination

1. This paper has THREE exercises.
2. Each exercise is allocated 30 minutes.
3. All dimensions are in millimeters unless stated otherwise.
4. The paper consists of 6 printed pages. 

QUESTIONS

EXERCISE 1
The diagram in figure 1 below shows a wooden block. Using the drawing paper and instruments provide, draw in third angle the orthographic projection. (20 marks)

Figure 1

EXERCISE 2
Using the materials, tools and equipment provided, fabricate the stand as shown in the figure 2 below. (20 marks)

EXERCISE 3
Figure 3 below shows a lighting circuit. Using materials, tools and equipment provided, install the circuit such that the switch controls the lamp. (20 marks)

EXERCISE 4
Using materials, components and equipment provided, perform the following tasks.

1. Correct the circuit shown in figure 1. (3 marks)
   Let the examiner check your work.
   Potentiometer
   
   Figure 1
2. Close switch S.
3. Adjust the potentiometer for the ammeter to obtain current values in table 1 and in each case record the corresponding voltage values. (7 marks)
   

   Current I(mA)	20	40	60	100	140
   Voltage(V)
   v(V-1)  I

4. Calculate the values of V/I and record them in the spaces provided in the table.
5. Use the values in the table to draw a graph of voltage against current.
   
6. Determine the slope of the graph. (2 marks)
7. From the graph, determine the voltage, V when the current I = 160mA.
   V = ................................................................................................ (1 mark)
8. State the purpose of the experiment. (1 mark)

MARKING SCHEME

EXCERCISE 1

 EXERCISE 2

EXERCISE 2
Using the materials, tools and equipment provided, fabricate the stand as shown in the figure 2 below. (20 marks)

EXERCISE 3
Figure 3 below shows a lighting circuit. Using materials, tools and equipment provided, install the circuit such that the switch controls the lamp. (20 marks)