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The following question based on electric current and magnetism topic of general science mcq
(a) A step up transformer
(b) An inverter
(c) A UPS
(d) A step down transformer
The correct answers to the above question in:
Answer: (d)
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Question : 1
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 : 2
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 : 3
An alternating current can be converted into direct current by a
a) transformer
b) dynamo
c) rectifier
d) motor
Answer »Answer: (c)
Question : 4
Fluorescent tubes are fitted with a choke. The choke coil
a) Reduces current in the circuit
b) Steps up the line voltage
c) Steps down the line voltage
d) Chokes low frequency current
Answer »Answer: (b)
Question : 5
An electric bulb is connected to 220 V generator. The current is 0.5A. The power of the bulb is
a) 440 W
b) 110 W
c) 110 V
d) 220 W
Answer »Answer: (b)
Question : 6
In electric apparatus ‘Earth’ is used
a) For safety
b) To reduce the expenditure
c) Because the apparatus used 3-phase
d) In the form of fuse
Answer »Answer: (a)
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