Which of the following is a pure semiconductor?
A. carbon B. silicon C. transistor D. phosphorus Correct Answer: Option B – silicon Explanation A semiconductor is a material whose conductivity is between good conductor and insulator. Example of pure semi-conductors are silicon and...
Transistors are used for the?
A. rectification of signals B. conversion of a.c to d.c C. amplification of signals D. conversion of d.c to a.c Correct Answer: Option C – amplification of signals Explanation Transistor serves the same purpose as triode valve, which is an amplification of...
The ground stated energy for the hydrogen atom is 5.44 x 10^-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation. [h = 6.6 x 10^-34 Js]
A. 5.0 x 1016 Hz B. 2.0 x 1016 Hz C. 5.0 x 1015 Hz D. 2.0 x 1015 Hz E. No correct option Correct Answer: Option E = No correct option Explanation ∆E = hf f = (∆E)/h = (5.44 x 10-19)/6.6 x 10-34 = 8.24 x...
In a discharge tube; most of the gas is pumped out so that electricity is conducted at?
A. low voltage B. steady voltage C. high pressure D. low pressure Correct Answer: Option D – low pressure Explanation pumping out of the gas in the discharge tube reduces the pressure inside the tube, therefore, electricity is conducted at low...
In alternating current circuit at resonance; the angel of lead or lag is?
A. π° B. (π)/2° C. (π)/3° D. 0° Correct Answer: Option D = 0°Products
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