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The following question based on electric current and magnetism topic of general science mcq
(a) Neutral wire
(b) Live wire
(c) Earth wire
(d) Fuse wire
The correct answers to the above question in:
Answer: (a)
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Read more physics gk Based General Science Questions and Answers
Question : 1
If the conductivity of a semiconductor is only due to break up of the covalent bonds due to thermal excitation, then the semiconductor is called
a) extrinsic
b) donor
c) intrinsic
d) acceptor
Answer »Answer: (c)
Question : 2
Which one of the following is not a correct statement about semiconductors?
a) In an n-type semiconductor, the Fermi level lies closer to the conduction band edge
b) Silicon is a direct band gap semiconductor
c) The electrons and holes have different mobilities in a semiconductor
d) Silicon is has diamond structure
Answer »Answer: (b)
Silicon is an indirect-band gap semi-conductor. CB VB Donor level
Question : 3
On charging by conduction, mass of a body may
a) decreases
b) increase or decrease
c) increase
d) none of these
Answer »Answer: (b)
On charging by conduction, body may gain mass, if it acquires negative charge. It may lose mass, if it acquires positive charge.
Question : 4
Consider the following statements regarding a motor car battery:
- The voltage is usually 12 V.
- Electrolyte used is hydrochloric acid.
- Electrodes are lead and copper.
- Capacity is expressed in ampere-hour.
a) 3 and 4
b) 1 and 2
c) 2 and 3
d) 1 and 4
Answer »Answer: (d)
Question : 5
Parameters of electricity supply in India are
a) Potential Difference of 220 V, Frequency of 60 hertz and Current Rating of 15A
b) Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A
c) Potential Difference of 150 V, Frequency of 40 hertz and Current Rating of 10 A
d) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating of 5 A
Answer »Answer: (b)
Parameters of electricity supply are different in different countries. In India they are:
Potential Difference of 220 V, Frequency of 50 hertz and
Current Rating of 5A/15A.
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