20 February 2011

IIT JEE 2006


Note: The marking Scheme is (+3, −1) for question numbers 1 to 12 , (+5,  −1) for question numbers 13 to 20  (+5, −2) for question numbers 21 to 32 and (+6, 0) for question numbers 33 to 40.
 
1.  Given,      R1 = 1Ω ; R2 = 2Ω ; C1 = 2µF ; C2 = 4µF
  

 The time constants (in µS) for the circuits I, II, III are respectively
(A) 18, 8/9, 4         (B) 18, 4, 8/9   
(C) 4, 8/9, 18          (D) 8/9, 18, 4

Sol. (D) τ1 = 8/9 µS ; τ2 = 18 µS ; τ3 = 4 µS