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MCQs

Total Questions : 4
Question 1.

A lightning bolt carrying 15,000 A lasts for 100 s. If the lightning strikes an airplane flying at 2 km, the charge deposited on the plane is


  1.    13.33 µC
  2.    75 C
  3.    1500 µC
  4.    1.5 C
 Discuss Question
Answer: Option D. -> 1.5 C

ΔQ = i * Δt
=  15000 * 100 µ
= 1.5C


Question 2.
In the circuit of fig P1.1.6 a charge of 600 C is delivered to the 100 V source in a 1 minute. The value of v1 must be

In The Circuit Of Fig P1.1.6 A Charge Of 600 C Is Delivered ...



  1.    240 V
  2.    120 V
  3.    60 V
  4.    30 V
 Discuss Question
Answer: Option A. -> 240 V

In The Circuit Of Fig P1.1.6 A Charge Of 600 C Is Delivered ...

In order for 600 C charge to be delivered to the 100 V source, the current must be anticlockwise.
i  = dQ / dt
  = 600/10
    = 60
Applying KVL we get
v1 + 60 - 100 = 10 * 20 or v1 = 240 V


Question 3.

Req ?

Req ?



  1.    11.86 Ω
  2.    10 Ω
  3.    25 Ω
  4.    11.18 Ω
 Discuss Question
Answer: Option D. -> 11.18 Ω

Req ?


Req = 5 + ((10+(Req + 5 ))/(10 + 5 + R eq))
‡’ R2eq + 15Req = 5Req + 75 + 10 Req + 50
‡’ Req = ˆ125 = 11.18©


Question 4.

The energy required to charge a 10 F capacitor to 100 V is


  1.    0.10 J
  2.    0.05 J
  3.    5 x 10-9 J
  4.    10 x 10-9 J
 Discuss Question
Answer: Option B. -> 0.05 J

   E  = ½Cv2  

       = 5 x 10-6x 1002
        = 0.05J


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