set 4 MCQ Questions & Answers Detailed Explanation
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The following question based on electric current and magnetism topic of general science mcq
(a) transformer
(b) dynamo
(c) rectifier
(d) motor
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 energy band gap is minimum in
a) superconductors
b) insulators
c) metals
d) semiconductors.
Answer »Answer: (c)
Maximum in insulators and minimum in metals.
Question : 2
In an electric motor, conversion takes place of
a) electrical energy into mechanical energy
b) electrical energy into light energy
c) chemical energy into electrical energy
d) electrical energy into chemical energy
Answer »Answer: (a)
Question : 3
The filament of a halogen lamp is an alloy of
a) Tungsten and sodium
b) Tungsten and iodine
c) Tungsten and bromine
d) Molybdenum and sodium
Answer »Answer: (a)
Question : 4
An oscillator is nothing but an amplifer with
a) negative feedback
b) large gain
c) positive feedback
d) no feedback
Answer »Answer: (c)
A positive feedback from output to input in an amplifier provides oscillations of constant amplitude.
Question : 5
Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg )C , (Eg )Si and (Eg )Ge. Which of the following statements is true?
a) (Eg )C < (Eg )Ge < (Eg )Si
b) (Eg )C > (Eg )Si > (Eg )Ge
c) (Eg )Si < (Eg )Ge < (Eg )C
d) (Eg )C = (Eg )Si = (Eg )Ge
Answer »Answer: (b)
Question : 6
A mobile phone charger is
a) A step up transformer
b) An inverter
c) A UPS
d) A step down transformer
Answer »Answer: (d)
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