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The following question based on electric current and magnetism topic of general science mcq
(a) 60 W bulb glows brightest
(b) 100 W bulb glows brightest
(c) 40 W bulb glows brightest
(d) All bulbs glow with same brightness
The correct answers to the above question in:
Answer: (c)
Current through each bulb is the same because these are connected in series. since $(R = V^2/P)$, the resistance of 40 W bulb is more.
Hence greater heat is produced in the 40 W bulb, it glows brightest H = $I^2$Rt
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Read more physics gk Based General Science Questions and Answers
Question : 1
n-p-n transistors are preferred to p-n-p transistors because:
a) they have low dissipation energy
b) they are capable of handling large power
c) they have low cost
d) electrons have high mobility than holes and hence high mobility of energy
Answer »Answer: (d)
Question : 2
Application of a forward bias to a p–n junction
a) increases the potential difference across the depletion zone.
b) increases the number of donors on the n side.
c) widens the depletion zone.
d) increases the electric field in the depletion zone.
Answer »Answer: (b)
P N Number of donors is more because of electrons from – ve terminal of the cell push (enters) the n-side and decreases the number of uncompensated pentavalent ion due to which potential barrier is reduced.
The neutralised pentavalent atom is again in a position to donate electrons.
Question : 3
What is the order of magnitude of electric resistance of the human body (dry)?
a) $10^6$ ohm
b) $10^2$ ohm
c) $10^4$ ohm
d) $10^8$ ohm
Answer »Answer: (a)
Question : 4
To shield an instrument from external magnetic field, it is placed inside a cabin made from
a) iron
b) wood
c) ebonite
d) diamagnetic substance
Answer »Answer: (a)
The cabin is made up of iron because maximum magnetic lines of forces pass through it.
Question : 5
Earth’s magnetic field always has a horizontal component except at
a) geographical north pole
b) magnetic equator
c) magnetic pole
d) at an altitude of 45°
Answer »Answer: (c)
Question : 6
A device which converts electrical energy into mechanical energy is
a) Electric motor
b) Dynamo
c) Transformer
d) Inductor
Answer »Answer: (a)
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