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The following question based on electric current and magnetism topic of general science mcq
(a) base
(b) collector
(c) emmiter
(d) can be any of the above three
The correct answers to the above question in:
Answer: (c)
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Read more physics gk Based General Science Questions and Answers
Question : 1
The heating element of an electric heater should be made with a material, which should have
a) high specific resistance and low melting point
b) low specific resistance and low melting point
c) high specific resistance and high melting point
d) low specific resistance and high melting point
Answer »Answer: (c)
A heating wire should be such that it produces more heat when current is passed through it and also does not melt.
It will be so if it has high specific resistance and high melting point.
Question : 2
Consider the following statements :
- An ammeter should have low resistance
- An ammeter should have high resistance
- A voltmeter should have low resistance
- A voltmeter should have high resistance
a) 2 and 3
b) 1 and 4
c) 1 and 3
d) 2 and 4
Answer »Answer: (b)
Ammeter is connected in series within the circuit. Therefore, the net resistance of the circuit increases and current to be measured decreases, so ammeter should have low resistance.
On the other hand voltmeter is connected in parallel within the circuit. This changes the overall current in the circuit and hence, the potential difference to be measured is also changed to minimise the error, so the equivalent resistance of the voltmeter should be large.
Question : 3
p-n junction diode works as a insulator, if connected
a) in forward bias
b) in reverse bias
c) to A.C.
d) None of these
Answer »Answer: (b)
In reverse bias no current flows.
Question : 4
When current is passed through an electric bulb, its filament glows, but the wire leading current to the bulb does not glow because
a) the leading wire has more resistance than the filament
b) the leading wire has less resistance than the filament
c) less current flows in the leading wire as compared to that in the filament
d) filament has coating of fluorescent material over it
Answer »Answer: (b)
Question : 5
The filament of an electric bulb is of tungsten because
a) it is cheaper
b) its melting point is high
c) its resistance is negligible
d) filament is easily made
Answer »Answer: (b)
Question : 6
Two magnets A and B are placed with like poles having one above another. What will happen?
a) A will move side ways
b) A will stuck to B
c) A will remain as in figure
d) Can't say
Answer »Answer: (c)
Unlike poles repel. The repulsive magnetic force will not allow the like poles to get stuck.
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