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The following question based on electric current and magnetism topic of general science mcq
- Metals in general are good conductors of electricity.
- Distilled water conducts electricity.
- Top water conducts electricity.
- Rubber is a bad conductor of electricity
(a) 1, 3 and 4
(b) 1 and 2
(c) 2 and 3
(d) 1, 2 and 3
The correct answers to the above question in:
Answer: (a)
Distilled water is insulator of electricity.
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Read more physics gk Based General Science Questions and Answers
Question : 1
Which one of the following is a non-magnetic substance?
a) Nickel
b) Iron
c) Cobalt
d) Brass
Answer »Answer: (d)
Question : 2
The magnetic compass is not useful for navigation near the magnetic poles. Since
a) H = 0
b) R = 0
c) V = 0
d) ϴ = 0°
Answer »Answer: (a)
Near the magnetic poles, H = 0, therefore, magnetic compass will not work.
Question : 3
What is the difference between a CFL and an LED Lamp?
- To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
- The average life span of a CFL is much longer than of an LED lamp.
- A CFL is less energy efficient as compared to an LED lamp.
a) 1 and 3
b) Only 1
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (a)
Question : 4
When a fuse is rated 8A, it means
a) it has a resistance of 8 ohm
b) it will work only if current is 8A
c) it will not work if current is less than 8A
d) it will burn if current exceeds 8A
Answer »Answer: (c)
Question : 5
The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct?
a) 110 V leads to lower power loss
b) 110 V is safer but more expensive to maintain
c) 110 V is safer and cheaper to maintain
d) 110 V works better at higher latitudes
Answer »Answer: (b)
Question : 6
Barrier potential of a p-n junction diode does not depend on
a) diode design
b) temperature
c) doping density
d) forward bias
Answer »Answer: (a)
[Hint : Barrier potential depends on, doping density, temperature, forward/reverse bias but does not depend on diode design.]
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