1. Two wires A and B have the same cross-section and are made of the same material. RA = 600 LI and RB = 100 The number of times A is longer than B is
A.6
B.2
C.4
D.5

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2. When a low resistance is connected in parallel with a high resistance, the combined resistance is
A. always more than the high resistance
B. always less than the low resistance
C. always between the value of high and low resistance
D. either lower or higher than low resistance depending on the value of high resistance

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3. Two 100 W, 200 V lamps are connected in series across a 200 V supply. The total power consumed by each lamp will be-watts.
A.25
B.50
C.100
D.200

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4. The factor which will have least effect on the voltage at the load end of a two-wire supply circuit is
A. length of the circuit
B. whether supply frequency is 25 Hz or 50 Hz
C. amount of load on the circuit
D. cross-section of the circuit wires

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5.  For a given line voltage, four heating coils will produce maximum heat when connected
A. all in parallel
B. all in series
C. with two parallel pairs in series
D. one pair in parallel with the other two in series

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6.  For current to flow, a circuit must be
A. isolated
B. insulated
C. complete
D. protected

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7.  If a 'live' conductor of a public supply touches earth metal
A. supply voltage will increase
B. supply voltage will decrease
C. no current will flow
D. current will flow to earth

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