What is a device that converts DC into AC called?
Correct answer D. Inverter
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Everyday Science MCQs
Page 146 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 146 of 198
In half-wave rectification, during which part of the AC cycle does the load receive output voltage?
Correct answer C. The positive half cycle of AC
In full-wave rectification, during which part of the input AC cycle is DC output obtained across the load?
Correct answer C. The complete cycle of input A.C
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Which of the following is not a donor impurity?
Correct answer C. aluminium
What causes the forward current through a semiconductor diode?
Correct answer C. Majority carriers
What is the order of magnitude of resistivity for an insulator?
Correct answer A. 10⁸ ohm metre
When is the depletion region of a p-n junction formed?
Correct answer B. During the manufacturing process
How is the simplest kind of rectification, half-wave rectification, achieved?
Correct answer C. Suppressing half wave of A.C supply by using diode
In a p-n-p transistor, how does the collector current compare with the emitter current?
Correct answer D. slightly less than emitter current
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A semiconductor containing donor atoms and free electrons is of which type?
Correct answer D. n-type
Which specially designed semiconductor diodes are used as indicator lamps in electronic circuits?
Correct answer D. The light emitting diode
What is a device or circuit that converts AC into DC called?
Correct answer D. A rectifier
Why can a semiconductor diode be used as a rectifier?
Correct answer B. It has low resistance to the current flow when forward biased & high resistance when reverse biased.
In the schematic symbol for a transistor, where is the arrow?
Correct answer A. Is located on the emitter
What are thermions?
Correct answer C. electrons
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Which type of material has the largest energy gap?
Correct answer C. Insulator
As a charge oscillates back and forth along a wire, how does its velocity behave?
Correct answer D. Changing
Which statement about minority carriers is correct?
Correct answer C. Holes in n-type and free electrons in p-type
In an n-p-n transistor, what role does the p region play?
Correct answer D. Base
How does a reverse-biased p-n junction behave?
Correct answer C. Off switch