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The following question based on electric current and magnetism topic of general science mcq
(a) 440 W
(b) 110 W
(c) 110 V
(d) 220 W
The correct answers to the above question in:
Answer: (b)
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Read more physics gk Based General Science Questions and Answers
Question : 1
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 : 2
A mobile phone charger is
a) A step up transformer
b) An inverter
c) A UPS
d) A step down transformer
Answer »Answer: (d)
Question : 3
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 : 4
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)
Question : 5
In the figure shown below, $L_1$ and $L_2$ are two lenses and are kept along the same axis. A parallel beam of light falling on $L_1$ leaves $L_2$ as a parallel beam: Consider the following statements.
- Both L1 and L2 can be convex lenses.
- The distance between the two lenses can be equal to sum of their focal lengths.
![electricity magnetism light question answer 39](https://careericons.com/adminicon/bunch/images/electricity-magnetism-light-question-answer-39.png)
a) Both 1 and 2
b) Only 1
c) Only 2
d) Neither 1 nor 2
Answer »Answer: (a)
Question : 6
A refracting telescope consists of
a) two concave mirrors of different focal lengths
b) one concave mirror and one convex lens
c) two convex lenses of equal focal length
d) two convex lenses of unequal focal lengths
Answer »Answer: (d)
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