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The following question based on electric current and magnetism topic of general science mcq
(a) rusting of the core may be prevented
(b) ratio of voltage in primary and secondary may be increased
(c) the weight of the transformer may be reduced
(d) energy losses due to eddy currents may be minimised
The correct answers to the above question in:
Answer: (d)
When there is change of flux in the core of a transformer due to change in current round it, eddy current is produced.
The direction of this current is opposite to the current which produces it, so it will reduce the main current.
We laminate the core so that flux is reduced resulting in the reduced production of eddy current.
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Read more physics gk Based General Science Questions and Answers
Question : 1
An electric bulb of 100 watt is used for 4 hours. The unit of electric energy used is
a) 4
b) 400
c) 25
d) 0.4
Answer »Answer: (d)
Question : 2
The earth’s magnetic field is approximately
a) 10 Tesla4
b) 1 Tesla
c) 2 Gauss
d) 1 Gauss
Answer »Answer: (d)
Question : 3
A device which converts chemical energy into electrical energy is called
a) Generator
b) Battery
c) Motor
d) Moving coil meter
Answer »Answer: (b)
Question : 4
Consider the following statements :
- Diamagnetism is temperature independent.
- Paramagnetism is explained by domain theory.
- Above curie temperature a ferromagnetic material becomes paramagnetic.
- Magnetic susceptibility is small and negative for diamagnetic substance.
a) 1, 2 and 3
b) 1 only
c) 2 only
d) 2 and 4
Answer »Answer: (c)
Domain theory is for ferromagnetic substance.
Question : 5
Consider the following statements :
- Water cannot be made to boil at 90°C.
- Charge on a conductor is mostly concentrated at places where the surface is mostly plain.
- The resistance of a fuse wire is high.
a) 3 only
b) 1 and 2
c) 1 only
d) 1, 2 and 3
Answer »Answer: (a)
- The boiling point of water is 100°C. If pressure decreases, boiling point of water decreases. Thus, water can be made to boil at 90°C, on decreasing pressure.
- It is not necessary that charge on a conductor is mostly concentrated at nearly plain surfaces.
- The resistance of a fuse wire is high, so that it can easily melt during short circuit.
Question : 6
Assertion (A) :
Convex mirror is used as a driver mirror.
Reason (R) :
Images formed by convex mirror are diminished in size.
a) A is true but R is false
b) Both A and R are individually true and R is the correct explanation of A
c) Both A and R are individually true but R is NOT the correct explanation of A
d) A is false but R is true
Answer »Answer: (c)
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