Which of the following reduce(s) the effect of the back e.m.f. generated in the primary coil of an induction coil?
I. The capacitor in the circuit II. The make and break contact in the circuit III. The ratio of turns in the secondary to that in the primary A. l only B. II only C. I and II only D. II and III only E. I, II and III. Correct Answer: Option C – I and II...
How long will it take to heat 3 kg of water from 28°C to 88°C in an electric taking a current of 6 A from an e.m.f. source of 220V?
A. 96s B. 1.20s C. 570s D. 600s E. 1200s Correct Answer: Option C – 570s Explanation Ivt = mcΔθ t = mcΔθ/Iv = 3x 4200 x (88 – 28)/6 x 200
A cell of e.m.f. 1.5 V and internal resistance of 2.59 is connected in series with an ammeter of resistance 0.59 and a resistor of resistance 7.09. Calculate the current in the circuit.
A. 0.15 A B. 0.20 A C. 0.60A D. 3.00A E. 6.67A. Correct Answer: Option A – 0.15 A Explanation I = E/R + r = 1.5/2.5 + 0.5 + 7 = 0.15
Birds can perch safely on overhead electric power cables without being electrocuted because?
A. birds can withstand high p.d. of the electric power cables B. any accumulated charge on the birds is quickly dissipated C. the feet of the birds are well insulated D. the current is a.c. and has particular direction E. there is no p.d between the birds and the...Products
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