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The following question based on electric current and magnetism topic of general science mcq
(a) Conversion of mechanical energy to electrical energy
(b) Conversion of high voltage to low voltage
(c) Conversion of electrical energy to mechanical energy
(d) Conversion of low voltage to high voltage
The correct answers to the above question in:
Answer: (a)
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Question : 1
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.
Question : 2
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 : 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
From a power station, the power is transmitted at a very high voltage because –
a) electricity at high voltage is less dangerous
b) it is generated only at high voltage
c) it is cheaper to produce electricity at high voltage
d) there is less loss of energy in transmission at high voltage
Answer »Answer: (c)
Question : 5
Alternate current is not preferable
a) To transmit electric power
b) To charge storage battery
c) To run/start an electric motor
d) To heat up electric toaster
Answer »Answer: (b)
Question : 6
Which one among the following is used to make periscope?
a) Plane mirror
b) Concave lens
c) Concave mirror
d) None of the above
Answer »Answer: (a)
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