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The following question based on electric current and magnetism topic of general science mcq
(a) 10 units
(b) 0-1 unit
(c) 1 unit
(d) 100 units
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
Choke coil works on the principle of
a) self induction
b) mutual induction
c) transient current
d) wattless current
Answer »Answer: (a)
Question : 2
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 : 3
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 : 4
Consider the following statements regarding electric fuse wire:
- It has low melting point.
- It has very high specific resistance.
- It is connected in parallel with the electric circuit.
a) 1 and 2
b) 1 only
c) 1 and 3
d) 2 and 3
Answer »Answer: (a)
An electric fuse wire should have low melting point and very high specific heat. Also it is connected in series with the electric circuit.
Question : 5
A compass which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
a) will stay in any position
b) will stay in north-south direction only
c) will stay in east-west direction only
d) None of these
Answer »Answer: (a)
At geomagnetic poles, there is no horizontal component of earth field and so compass needle may stay at any position.
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