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The following question based on electric current and magnetism topic of general science mcq
(a) Real, not magnified
(b) Virtual, not magnified
(c) Virtual, magnified
(d) Real, magnified
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
Alternating current is converted to direct current
a) By Transformer
b) By Dynamo
c) By Motor
d) By Rectifier
Answer »Answer: (d)
Question : 2
In which one of the following cases Ohm’s law is not valid?
a) Junction diode
b) Wire bound resistor
c) Potentiometer
d) Electric bulb
Answer »Answer: (a)
Question : 3
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)
Graphene is a two-dimensional material and has good electrical conduction. It is one of the thinnest but strongest materials tested so far.
It can be used for conducting electrodes required for touch screens, LCDs and organic LEDs.
Question : 4
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 : 5
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 : 6
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.
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