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The following question based on electric current and magnetism topic of general science mcq
(a) They draw heat proportional to $v^2$
(b) They draw more current which is inversely proportional to the voltage
(c) They draw more current which is inversely proportional to the square root of the voltage
(d) Low voltage sets in electrical discharge
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
Domestic electrical wiring is basically a
a) Combination of series and parallel connections
b) Series connection
c) Parallel connection
d) Series connection within each room and parallel connective elsewhere
Answer »Answer: (c)
Question : 2
To obtain a p-type germanium semiconductor, it must be doped with
a) antimony
b) indium
c) arsenic
d) phosphorus
Answer »Answer: (b)
For p-type semiconductor the doping impurity should be trivalent.
Question : 3
The Donor level in a semiconductor is placed
a) in the forbidden energy gap close to the upper edge of the valence band
b) in the conduction band close to the lower edge to the conduction band
c) half-way in the forbidden energy gap
d) in the forbidden energy gap close to the lower edge of the conduction band
Answer »Answer: (d)
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
Consider the following statements :
- The strength of magnetic field of a permanent magnet decreases with the increase in temperature.
- A permanent magnet can be demagnetised by beating it.
- A charged particle moving parallel to direction of magnetic field experiences a force.
a) 1 and 3
b) 1 and 2
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (b)
According to $F↖{→}$ = qvB sin θ,
If angle between the direction of particle and magnetic field is 0° then $F↖{→}$ = 0.
Question : 6
Choke coil works on the principle of
a) self induction
b) mutual induction
c) transient current
d) wattless current
Answer »Answer: (a)
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