Electric Current And Magnetism - Category Wise Question And Answer Practice Test With Solutions
ELECTRIC CURRENT AND MAGNETISM PRACTICE TEST [9 - EXERCISES]
Set 1
Set 2
Set 3
Set 4
Set 5
Set 6
Set 7
Set 8
Set 9
Question : 21
Three bulbs of 40 W, 60 W and 100 W are connected in series to a current source of 200 V. Which of the following statements is true ?
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
Answer »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
Question : 23
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.
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