In a series R – C circuit, the resistance of the resistor is 4 Ω and capacitive reactance is 3 Ω. Calculate the impedance of the circuit
A. 1Ω B. 4Ω C. 5Ω D. 7Ω E. 12Ω Correct Answer: Option C = 5Ω Explanation Z = √R² + x² Z = √4² + 3² = 5Ω
What is the gravitational potential due to a point mass m at a distance from it? (G = gravitational constant)
A. -Gm²/r² B. -Gm²/r C. –Gm/Gr² D. –Gm/r E. –Gm/2 Correct Answer: Option D = –Gm/r
A household refrigerator consumes electrical energy at the rate of 200 W. lf electricity costs 5 k per kWh, calculate the cost of operating the appliance for 30 days.
A. N7.20 B. N12.00 C. N30.00 D. N33.33 E. N72.00 Correct Answer: Option A – N7.20 Explanation E = 200 x 30 x 24 Wh = 144000; Wh = 144KWh Cost 144 x 5k = N7.20
The unit of inductance is?
A. farad B. henry C. hertz D. weber E. tesla Correct Answer: Option B – henry
Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?
A. Electrophorus B. Ebonite rod C. Proof plane D. Gold-leaf electroscope E. Capacitor Correct Answer: Option D – Gold-leaf electroscopeProducts
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