One major reason why electrical appliances in homes are normally earthed is that the?
A. person touching the appliance is safe from electric shock B. appliances are maintained at a higher p.d. than the earth C. appliances are maintained at a lower p.d. than the earth D. appliances are maintained at the same p.d. with that of the earth Correct Answer:...Three cells each of emf, 1.0 V, and internal resistance, 2 Ω, are connected in parallel across a 3Ω resistor. Determine the current in the resistor.
A. 0.90A B. 0.39A C. 0.30A D. 0.01A Correct Answer: Option C = 0.30A
In a series R-L-C circuit at resonance; impedance is?
A. maximum B. minimum C. capacitive D. inductive Correct Answer: Option A – maximum Explanation Since the current flowing through a parallel resonance circuit is the product of voltage divided by impedance, at resonance the impedance, Z is at its maximum value....
An inductor of inductance 10 H is connected across an a.c circuit source of 50 V, 100 Hz. What is the current in the circuit? [π = 3.14]
A. 0.200A B. 0.070A C. 0.050A D. 0.008A Correct Answer: Option D = 0.008A
The speed of fast-moving neutrons in a nuclear reactor can be reduced by using?
A. graphite rods B. concrete shield C. iron rods D. boron rods Correct Answer: Option A – graphite rods Explanation Moderation is the process of the reduction of the initial high speed (high kinetic energy) of the free neutron. Since energy is conserved, this...Products
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