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The following question based on electric current and magnetism topic of general science mcq
(a) no bias voltage is required
(b) both junctions are forward biased
(c) The emitter base junction is forward biased and the base collector junction is reverse biased
(d) both junctions are reverse biased
The correct answers to the above question in:
Answer: (c)
To use a transistor as an amplifier the emitter base junction is forward biased while the collector base junction is reverse biased.
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Read more physics gk Based General Science Questions and Answers
Question : 1
Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is
a) 20 ohm
b) 5 ohm
c) 10 ohm
d) 40 ohm
Answer »Answer: (c)
Question : 2
Assertion (A) :
A person stands at a distance of 1m in front of a concave mirror. If the radius of curvature of the mirror is 4m, the image of the person lies at a distance 2m behind the mirror.
Reason (R) :
The general mirror equation confirms the location of the image from the mirror and it could be a real image.
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: (a)
Question : 3
A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the source constant, then bulb will
a) give less intense light
b) give light of same intensity before
c) give more intense light
d) stop radiating light
Answer »Answer: (c)
Question : 4
Assertion (A):
Light Emitting Diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFL).
Reason (R):
Light Emitting Diodes (LED) lamps are more energy efficient as compared to the Compact Fluorescent Lamps (CFL).
Select the correct answer using the codes given below.
Code
a) (A) is true, but (R) is false
b) Both (A) and (R) are true and (R) is the correct explanation of (A)
c) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (b)
Question : 5
Which is not a device based on the heating effect of electricity?
a) Toaster
b) Refrigerator
c) Heater
d) Press
Answer »Answer: (a)
Question : 6
p-n junction is said to be forward biased, when
a) the positive pole of the battery is joined to the n-semiconductor and p-semiconductor
b) the positive pole of the battery is connected to n- semiconductor and p- semiconductor
c) the positive pole of the battery is joined to the p-semiconductor and negative pole to the n-semiconductor
d) a mechanical force is applied in the forward direction
Answer »Answer: (c)
For forward biasing of p-n junction, the positive terminal of external battery is to be connected to p-semiconductor and negative terminal of battery to the n-semiconductor.
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