Q1: In Flutter, which widget is primarily used to layout children in a vertical direction, where the total number of children $n$ is defined by the children property?

• Row
• Column
• Stack
• Container

Q2: In Dart, what is the value of the integer $x$ after executing $int x = 5 + 3 * 2$;?

• $16$
• $11$
• $10$
• $8$

Q3: Which method must be called to notify the framework that the internal state of a StatefulWidget has changed, triggering a rebuild where the count of frames $f$ updates from $f$ to $f+1$?

• notifyListeners()
• rebuild()
• setState()
• update()

Q4: Which of the following is true regarding the 'const' constructor in Dart, where $c$ represents a constant object?

• It can be changed at runtime
• It creates an object that is compiled to a fixed memory address $m$
• It is only used for classes with $0$ properties
• It is mandatory for all widgets

Q5: If a widget's opacity $o$ is set to $0.0$, what is the visibility state of that widget on the screen?

• It is fully visible
• It is partially transparent with $o = 0.5$
• It occupies space but is invisible
• It is removed from the widget tree