Excel VBA Professional Standards & Competencies 3

Question 1

A macro loops through 50,000 rows and runs slowly. Which professional optimization technique should be applied first?

Accepted Answer

Turn off ScreenUpdating and set Calculation to Manual before the loop

Answer

Disabling screen updates and automatic recalculation dramatically reduces overhead in large data loops.

Question 2

Which error-handling structure is considered the professional standard for robust VBA procedures?

Accepted Answer

Using 'On Error GoTo ErrorHandler' with a labeled cleanup section

Answer

'On Error GoTo ErrorHandler' with a structured cleanup section ensures errors are caught, logged, and resources are properly released.

Question 3

In VBA, what is the professional advantage of using Named Constants (Const) instead of magic numbers?

Accepted Answer

Constants make the code self-documenting and centralise values that may change

Answer

Named constants replace cryptic literals with readable names and allow a single edit point if the value ever needs updating.

Question 4

A colleague's VBA code uses 'Select' and 'Activate' extensively (e.g., Range.Select then Selection.Copy). What is the professional concern?

Accepted Answer

Relying on Select slows code, causes screen flicker, and is fragile if the active sheet changes

Answer

Direct object references (e.g., Range.Copy Destination:=...) are faster, more stable, and do not depend on which sheet is currently active.

Question 5

What is the professional role of a modular design approach in large VBA projects?

Accepted Answer

It breaks code into small, single-purpose procedures that are easier to test and reuse

Answer

Modular design improves testability, reuse, and maintainability by ensuring each procedure has one clear responsibility.

Excel VBA Practice Test