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What is the main purpose of ‘use strict’ in JavaScript?
A. To enable strict mode
B. To prevent syntax errors
C. To enable debugging
D. To declare variables
Answer: To enable strict mode
Which of the following languages is primarily used for web development?
A. Python
B. Java
C. HTML
D. C++
Answer: HTML
In C++, which operator is used to access members of a class?
A. .
B. ->
C. ::
D. =>
Answer: .
Which operator is used to concatenate strings in PHP?
A. +
B. &
C. .
D. *
Answer: .
In JavaScript, what does `typeof` return for an array?
A. 'object'
B. 'array'
C. 'list'
D. 'collection'
Answer: 'object'
In Python, how do you declare a variable?
A. int x = 5;
B. x = 5
C. declare x = 5
D. let x = 5
Answer: x = 5
Which keyword is used to declare a block of statements in a Java method?
A. block
B. begin
C. { }
D. do
Answer: { }
In Ruby, which method is used to convert an array to a string?
A. join
B. concat
C. str
D. to_string
Answer: join
Which method is used to get the length of a string in Java?
A. size()
B. len()
C. length()
D. count()
Answer: length()