Question

What is the value of u[1], where u[n] is the unit step function?

(a) 1

(b) 0.5

(c) 0

(d) -1

I had been asked this question at a job interview.

The above asked question is from Useful Signals topic in division Signals and Systems Basics of Signals and Systems

Answer 1

Correct option is (a) 1

Easiest explanation: The unit step function u[n] = 1 for all n>=0, hence u[1] = 1.