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Q1— Section header —
1.10\in the ANSWER BOOK COLUMN A COLUMN B
1.10North and south poles Ch arged atom Longitudinal Used as a switch or an amplifier Combination of different elements Can move through a vacuum Anything that occupies space
Q2— Section header —
2.1Explain the difference between a conductor and an insulator (4\
2.2What does the nucleus of an atom comprise of? (2\
2.3Give the number of electrons in the first shell of an atom. (1\
2.4Name THREE different forms of matter. (3\ [10] 1104085110
Q3— Section header —
3.1Study the circuit diagram below and answer the questions that follow
3.1.1Calculate the total resistance of the circuit. (4\
3.1.2Calculate the total current flowing in the circuit (2\
3.1.3Calculate the current flowing through the 3 (2\
3.2Determine the voltage of a combination of SIX cells of each connected in series.
Q4— Section header —
4.1Briefly define mutual inductance (4\
4.2List the FOUR most important characteristics of flux lines. (4\
4.3Name the TWO poles of a magnet. (2\ [10]10
Q5— Section header —
5.1A moving coil meter has a coil resistance of 100 . A current of 12 mA flowing through the coil gives full scale deflection. Calculate the value of a shunt resistor required to enable the meter to have a
5.2Make a neat labelled sketch of a series type ohm meter using a moving coil meter.
5.3State THREE disadvantages of a moving coil meter. (3\ [10] 10 V10
Q6— Section header —
6.1Draw a neat labelled sine wave that represents a 720 spread. Indicate the peak value, peak to peak value and the time period on the drawing. (4\
6.2
6.3efin frequency (2\ [10]10
Q7— Section header —
7.1Make a neat labelled sketch of a simple moving coil microphone. (4\
7.2Radio waves travel at the speed of light. What is the value of the speed of light? (2\
7.3Classify the following as ELECTROMAGNETIC WAVES or LONGITUDINAL WAVES by writing only 'E lectromagnetic ' or 'L
7.3.4\n the ANSWER BOOK
7.3.1Space waves
7.3.2The output of a speaker
7.3.3The input to a microphone
7.3.4Waves emitted from an antenna (4 1\ (4\ [10]10
Q8— Section header —
8.1Diodes are made of type and P type semiconductor material. Explain how P
8.2Draw a labelled sketch of the internal structure of a P junction diode. The sketch must show the barrier potential and the depletion region. (4\
8.3Name the THREE pins or legs of a transistor. (3\ [10] 1104085110
Q9— Section header —
9.1Draw the IEC symbols for the following components.
9.1.1NPN transistor
9.1.2Coil
9.1.3Variable resistor (3 (3\
9.2The value of a resistor is 270 with a tolerance of 5%. Give the colour code for this resistor. (4\
9.3Name THREE factors that affect the capacitance of a capacitor. (3\ [10]10
Q10— Section header —
10.1ith the aid of a block diagram , explain the operation of an oscillator. (5\
10.2Draw a fully labelled circuit diagram of a full wave power supply. The drawing must include a cent tap transformer, two diodes, a capacitor