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The following question based on electric current and magnetism topic of general science mcq
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
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
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 : 2
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 : 3
The core of a transformer is laminated because
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
Answer »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.
Question : 4
If the distance between the conduction band and valence band is 1 eV. This combination is
a) conductor
b) metal
c) semiconductor
d) insulator
Answer »Answer: (c)
Distance between conduction band and valence band = Fermi gap energy = 1eV.
Since there is a small gap between the conduction and valence band so it is semiconductor.
Question : 5
When the S–pole of a magnet is placed near an unknown pole of another magnet, the two magnets
a) attract each other because the unknown pole is S–pole
b) repel each other because the unknown pole is N–pole
c) repel each other because the unknown pole is S–pole
d) can either attract or repel
Answer »Answer: (c)
Question : 6
Consider the following statements: An ordinary light bulb has a rather short life because the:
- filament wire is not uniform.
- bulb cannot be evacuated completely.
- wires supporting the filament melt at high temperatures.
a) 1 and 2
b) 1 and 3
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
The electric light bulb uses a glowing wire filament heated by electrical resistance to white to generate light (a process known as thermal radiation).
The ‘bulb’ is the glass enclosure which keeps the filament in a vacuum or low-pressure noble gas. Complete evacuation of bulb is not possible. A small quantity of gases left behind which expands on heating by heat through filament.
Moreover, the wires supporting the filament sometimes melt due to high heat generated as a result of high resistance of filament. Thus, these factors leads to short life span of ordinary bulb.
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