by Sunday | Nov 10 | Physics JAMB
A. increases B. decreases C. remains the same D. increases and then decreases Correct Answer: Option B – decreases Explanation Heating a pure semiconductor increases the mobility of electrons and holes and hence the conductivity. thus, the resistance decreases...
by Sunday | Nov 10 | Physics JAMB
A. current amplification B. power amplification C. voltage regulation D. energy conversion Correct Answer: Option C = voltage regulation Explanation Zener diode is useful in stabilized power supply i.e to keep steady the voltage of a power...
by Sunday | Nov 10 | Physics JAMB
A. 0.31 A B. 3.20 A C. 3.40 A D. 5.00 A Correct Answer: Option A = 0.31 A Explanation Efficiency = (power output)/power input x 100% = 1sVs/1pVp x 100% ∴ (80)/100 = (50)/IP x 200 I P = (50 x 100)/80 x 200 = 3.125...
by Sunday | Nov 10 | Physics JAMB
A. slip-ring B. carbon brushes C. split ring D. armature Correct Answer: Option C = split ring Explanation To correct and A.C generator with a D.C generator the slip ring is replaced with split-ring communicator
by Sunday | Nov 10 | Physics JAMB
A. 0.96 kWh B. 19.2 kWh C. 9.60 kWh D. 19.20 kWh Correct Answer: Option B = 19.2 kWh Explanation Energy consumed = power x time = (60 W x 10 + 40 W x 5) x 24 h = (600 W + 200 W ) x 24 h = 800 W x 24h = 19200 w h = 19.2...
by Sunday | Nov 10 | Physics JAMB
A. 11:1 B. 1:11 C. 12:11 D. 11:12 Correct Answer: Option C = 12:11 Explanation Power supplied = IE = 20 X 240 = 4800 W Power dissipated = IV = 20 X 220 = 4400 W (Power supplied)/Power dissipated = (4800 W)/4400 W =...
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