2.  If f(t) = A d(t  a), F(s) is 

Answer: Option A Explanation: It is an impulse having area A and originating at t = a. 
3.  Double integration of a unit step function would lead to 


5.  Which one is a causal system? 

Answer: Option A Explanation: For causal output must depend upon Present and past not on future. 
6.  As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes 

Answer: Option D Explanation: £f(t  T) = e^{st} F(s). 
7.  An impulse function consist of 

Answer: Option C Explanation: Because F.T. of δ(t) = 1, 1 is a Constant function ranging from ∞ to +∞. 
8.  
Answer: Option A Explanation: (s + 1) term will give e^{t }and (s + 2) term will give e^{2t }. 