if any discrete time signal is multipled by unit step then is it periodic

A discrete time periodic signal is defined as x(n)= x(n+N), what is the significance of N?Group of answer choicesSamples/ twice cycleNoneSamples/CycleRate of change of the period

Both Analog and Digital signals can bea.Periodic or NonPeriodicb.Non Periodicc.Noned.Periodic

Choose an appropriate option that correctly defines periodic signals.Group of answer choicesNoneThe signal that changes with timeThe signal that repeats itself in timeThe signal that changes with frequency

Determine the notation that specifies the condition of periodicity for a continuous time signal ?Group of answer choicesx(t) = x( t +T0)Nonex(t) = e^-αtx(n) = x( n+ N)

Let x[n] be a discrete-time signal, and let yi[n] = x[2n] and y2[n] = { x[n/2], 0, n even n odd The signals y, [n] and y₂[n] respectively represent in some sense the speeded up and slowed down versions of x[n]. However, it should be noted that the discrete-time notions of speeded up and slowed down have subtle differences with respect to their continuous-time counterparts. Consider the following statements: (1) If x[n] is periodic, then y₁[n] is periodic. (2) If y₁[n] is periodic, then x[n] is periodic. (3) If x[n] is periodic, then y₂[n] is periodic. (4) If y₂[n] is periodic, then x[n] is periodic. For each of these statements, determine whether it is true, and if so, determine the relationship between the fundamental periods of the two signals considered in the statement. If the statement is not true, produce a counterexample to it.