Which of the following factors does not affect the electric resistance of wire?
A. length B. mass C. temperature D. cross-sectional area Correct Answer: Option B B. massIn the wiring of houses, the fuse is connected to the wire coloured?
A. blue B. brown C. yellow D. yellow and green Correct Answer: Option B B. brownA galvanometer of internal resistance 50Ω and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950Ω in series to it. Calculate the maximum voltage that can be read by the voltmeter
A. 20V B. 30V C. 38V D. 40V Correct Answer: Option D D. 40V Explanation V = IR1 + IR2 = 0.02 x 50 + 0.02 x 1950 = 40VDetermine the potential difference. V across the parallel resistors
A. 2.0V B. 2.3V C. 3.0V D. 0.7V Correct Answer: Option B B. 2.3V Explanation V = IR = 0.97 x 2.4 = 2.3VProducts
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