A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is?
A. 25% B. 33% C. 50% D. 75% Correct Answer: Option D – 75% Explanation Efficiency = Output/input x 100/1 Efficiency = 3/(3+1) x 100/1 = 3/4 x 100/1 = 75%
A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is?
A. 200 Ω B. 50 Ω C. 100/π Ω D. 25/π Ω Correct Answer: Option A = 200 Ω Explanation Inductive reactance is given by XL = WL = 2πfL XL = 2 x π x (50/π) x 2 XL = 200Ω
A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are?
A. beta rays B. gamma rays C. x-rays D. ultra-violet rays Correct Answer: Option A – beta rays
If the fraction of the atoms of a radioactive material left after 120years is 1/64. What is the half-life of the material?
A. 24 years B. 20 years C. 10 years D. 2 years Correct Answer: Option B – 20 years Explanation 1/64 is the usual fraction left of any radio active material after 4 half-lives, since 1/64 = (1/2)6 This implies that 6 half-lives have elapsed. Thus 6 half lives =...An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is?
A. 80.0W B. 40.0W C. 10.0W D. 0.1W Correct Answer: Option A = 80.0W Explanation Power input = 3KW = 3000W Voltage = 1.5KV = 1500V Current (I) = P/V = 3000/1500 = 2Amps. ∴ Power loss in the cables = I²R = 2 x 2 x 20 =...Products
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