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The following question based on electric current and magnetism topic of general science mcq
(a) in the forbidden energy gap close to the upper edge of the valence band
(b) in the conduction band close to the lower edge to the conduction band
(c) half-way in the forbidden energy gap
(d) in the forbidden energy gap close to the lower edge of the conduction band
The correct answers to the above question in:
Answer: (d)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Consider the following statements. An ordinary light bulb has a rather short life because the
- Filament wire is not uniform.
- Bulb cannot be evacuated completely.
- Wires supporting the filament melt at high temperatures.
a) 1 and 3
b) 1 and 3
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
Question : 2
Graphene is frequently in news recently. What is its importance?
- It is a two-dimensional material and has good electrical conductivity.
- It is one of the thinnest but strongest materials tested so far.
- It is entirely made of silicon and has high optical transparency.
- It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.
a) 1, 2 and 4 only
b) 1 and 2 only
c) 3 and 4 only
d) 1, 2, 3 and 4
Answer »Answer: (a)
Question : 3
In a p-n junction
a) the p side is at higher electrical potential than n side
b) the n side is at higher electric potential than p side
c) the potential of p & n sides becomes higher alternately
d) both p & n sides are at same potential
Answer »Answer: (a)
Hint : For easy flow of current the p-side must be connected to +ive terminal of battery
i.e., it is connected to higher potential in comparison to n. This connection is called forward biased. In this case the input resistance is very low.
In reverse-biased, the p-side is connected to –ive terminal & n-side to (+ive) terminal to battery. In this case input resistance is very high.
Question : 4
To obtain a p-type germanium semiconductor, it must be doped with
a) antimony
b) indium
c) arsenic
d) phosphorus
Answer »Answer: (b)
For p-type semiconductor the doping impurity should be trivalent.
Question : 5
Domestic electrical wiring is basically a
a) Combination of series and parallel connections
b) Series connection
c) Parallel connection
d) Series connection within each room and parallel connective elsewhere
Answer »Answer: (c)
Question : 6
Electric motors operating at low voltages tend to burn out because
a) They draw heat proportional to $v^2$
b) They draw more current which is inversely proportional to the voltage
c) They draw more current which is inversely proportional to the square root of the voltage
d) Low voltage sets in electrical discharge
Answer »Answer: (b)
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