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The following question based on electric current and magnetism topic of general science mcq
(a) be of different materials
(b) have different cross-sections
(c) have different temperatures
(d) be of same density
The correct answers to the above question in:
Answer: (a)
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Read more physics gk Based General Science Questions and Answers
Question : 1
The temperature of the filament of lighted electric bulb is generally
a) 2000°C to 2500°C
b) 100°C to 500°C
c) 1000°C to 1500°C
d) 3000°C to 3500°C
Answer »Answer: (a)
Question : 2
Which of the statements is true for p-type semiconductos?
a) Electrons are minority carriers and pentavalent atoms are the dopants.
b) Holes are minority carriers and pentavalent atoms are the dopants.
c) Electrons are majority carriers and trivalent atoms are the dopants.
d) Holes are majority carriers and trivalent atoms are the dopants.
Answer »Answer: (d)
Question : 3
When a ferromagnetic material is heated to temperature above its Curie temperature, the material:
a) behaves like a diamagnetic material
b) is permanently magnetized
c) remains ferromagnetic
d) behaves like a paramagnetic material
Answer »Answer: (d)
At a particular temperature, known as curie temperature, ferromagnetic material changes over to paramagnetic material.
The ferromagnetic effects weaken with increasing temperature because random thermal motions tend to destroy the alignment of the magnetic dipole moments.
Question : 4
Small drops of the same size are charged to V volts each. If n such drops coalesce to form a single large drop, its potential will be
a) nV
b) $n^{2/3}$V
c) $n^{1/3}$V
d) $n^{–1}$V
Answer »Answer: (b)
Question : 5
Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be
a) Ten units
b) One unit
c) Two units
d) Twenty units
Answer »Answer: (a)
Question : 6
If a body is charged by rubbing it, its weight
a) increases slightly
b) decreases slightly
c) remains precisely constant
d) may increase slightly or may decrease slightly
Answer »Answer: (d)
The weight can be increased slightly, if it acquire negative charge & weight can be decreased slightly, if it acquires positive charge.
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