What is the output of the following code: let z = 3; z = 5; console.log(z);?
A). 3
B). 5
C). undefined
D). ReferenceError
Can a variable declared with let be hoisted?
A). Yes, partially
B). No
C). Yes, fully
D). Only in strict mode
What will the following code output: { const a = 10; a = 20; }?
A). 10
B). 20
C). undefined
D). TypeError
Can const be used for objects and arrays?
A). No
B). Yes
C). Only for arrays
D). Only for objects
Which keyword should be used for a variable that might be reassigned?
A). const
B). let
C). var
D). function
Which keyword is used to declare a read-only named constant?
A). let
B). var
C). const
D). static
What is the value of a const variable once it is assigned?
A). Can be changed later
B). Cannot be changed later
C). Depends on the data type
D). Undefined initially
What error will the following code produce: const PI; PI = 3.14;?
A). SyntaxError
B). TypeError
C). ReferenceError
D). No error
What is the primary difference between var and let?
A). Scope
B). Initialization
C). Data type
D). Assignment
Can a let variable be redeclared in the same scope?
A). Yes
B). No
C). Only if it is a string
D). Only if it is a number