Post training MCQ final TEST

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Which of the following is a characteristic of Dart programming language?

• a) Statically typed

• b) Dynamically typed

• c) Both (a) and (b)

• d) None of the above

Answer explanation

Dart is a programming language that is both statically typed and dynamically typed, making option c) Both (a) and (b) the correct choice.

What is the output of the following Dart code? void main() { int x = 10; switch (x) { case 5: print(“x is equal to 5”); break; case 10: print(“x is equal to 10”); break; default: print(“x is not equal to 5 or 10”); break; } }

• A) x is equal to 5

• B) x is equal to 10

• C) x is not equal to 5 or 10

• D) Compilation error

Answer explanation

The output of the code will be 'x is equal to 10' because the value of x is 10 and it matches the case 10 in the switch statement.

Arnav wants to declare a variable in Dart. Which of the following is the correct syntax?

• a) var x = 5;

• b) x = 5;

• c) int x = 5;

• d) var x = 5;

Answer explanation

The correct syntax to declare a variable in Dart is 'var x = 5;'.

What is the purpose of the “final” keyword in Dart?

• a) To define a constant variable

• b) To define a variable that cannot be changed after its initial assignment

• c) To define a variable that can only be accessed within its scope

• d) To define a variable that can be accessed from any scope

Answer explanation

The 'final' keyword in Dart is used to define a variable that cannot be changed after its initial assignment.

Which of the following operators is used for null-aware access in Dart?

• A) ==

• B) !=

• C) ?.

• D) !!

Answer explanation

The null-aware access operator in Dart is represented by the symbol ?. This operator allows accessing properties and methods of an object even if the object is null, preventing null reference errors.

Which of the following is the correct syntax for defining a function in Dart?

• a) function foo() {}

• b) void foo() {}

• c) int foo() {}

• d) dynamic foo() {}

Answer explanation

The correct syntax for defining a function in Dart is 'b) void foo() {}'. This syntax defines a function named 'foo' that returns no value (void).

Which of the following is a valid way to define a function in Dart?

• A) function sum(int a, int b) => a + b;

• B) def sum(int a, int b) { return a + b; }

• C) void sum(int a, int b) { print(a + b); }

• D) function sum(int a, int b) { return a + b; }

Answer explanation

The correct way to define a function in Dart is using the arrow syntax. Option A) function sum(int a, int b) => a + b; is the correct choice.