When a piece of rectangular glass block is inserted between two parallel capacitor; at constant plate area and distance of separation. The capacitance of the capacitor will?
A. increase B. decrease C. decrease then increase D. remain constant Correct Answer: Option A – increase
In a Daniel cell; the depolarizer; positive and negative electrodes are respectively?
A. copper sulphate, copper and zinc B. manganese dioxide, carbon and zinc C. sulphuric acid, lead oxide and lead D. potassium hydroxide, nickel and iron. Correct Answer: Option A – copper sulphate, copper and zinc Explanation In the Daniel cell, i. Depolarize =...
The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is?
A. 280.00 B. 160.00 C. 120.00 D. 140.00 Correct Answer: Option D – 140.00 Explanation Total power in watt = 60*5 + 4*100 = 300 + 400 = 700w Total power in kilo watt = 700/100 = 0.7 killo w Unit of electricity in killo watt-hour = 0.7 * 20hrs = 14 okwh i.e If I...
A working electric motor takes a current of 1.5A when the p.d across it is 250V. If its efficiency is 80%, the power output is?
A. 300.0W B. 469.0W C. 133.0W D. 4.8W Correct Answer: Option A Explanation Efficiency = power output/power Input => 80/100 = power output/1.5 x 250 i.e power output = (1.5 x 250 x 80)/100 =300wProducts
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