The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is?
A. 380mmHg B. 570mmHg C. 190mmHg D. 480mmHg Correct Answer: Option B – 570mmHg Explanation (p – 760)/(0 – 760) = (h – 0)/(80 – 0) ∴ (p – 760)/-760 = (20 – 0)/80 80(p-760) = -760(20-0) ∴80p – 60800 = -15200 80p = 60800...
At what frequency would a capacitor of 2.5μF used in radio circuit have a resistance of 250Ω?
A. π/800 Hz B. 800/π Hz C. 200π Hz D. 2000π Hz Correct Answer: Option B – 800/π Hz Explanation Capacitive Reactance = 1 2π + C => 250 = 1 2 x π x f x 2.5 x 106 ∴ 250/1 = 106/5.0xf => F = 106 250 x 5.0 x π = 106 1250π...The carbon-granules microphone works on the principle of change in?
A. inductance B. resistance C. capacitance D. voltage Correct Answer: Option B – resistance
A transistor is used in the amplification of signals because it?
A. controls the flow of current B. consumes a lot of power C. allows doping D. contains electron and hole carriers Correct Answer: Option A – controls the flow of currentProducts
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