Computational Thinking and Programming Quiz 2

✅ Answer: (c) High-level programming language

Python is classified as a high-level programming language — its syntax reads close to English and it abstracts away hardware-level details. (Its code does get run through an interpreter, but “interpreter” describes how it’s executed, not what kind of language it is.)

✅ Answer: (d) Dynamically typed

Python is dynamically typed — you don’t need to declare a variable’s data type; it’s decided automatically at runtime based on the value assigned. (Python is also strongly typed, but “dynamically typed” is the feature most commonly highlighted in the CBSE syllabus as distinguishing Python from languages like C++ or Java.)

✅ Answer: (b) Use the print() function to display “Hello World”

The classic first Python program is simply print(“Hello World”) — the print() function outputs text to the console. Python doesn’t require a main() function like C/Java do.

✅ Answer: (c) Interactive mode and script mode

Python code can be run in interactive mode (typing statements one at a time at the >>> prompt and seeing immediate results) or script mode (writing a complete .py file and running it all at once).

✅ Answer: (b) Unicode

Python’s character set is based on Unicode — a much larger standard than ASCII that lets Python source code and strings represent virtually any character from any language in the world.

✅ Answer: (b) if

if is a reserved Python keyword. Note: this question is slightly ambiguous in its original form — class is technically also a Python keyword (used to define a class), so both (b) and (d) are valid keywords. variable and function, however, are not keywords at all — Python uses def to define functions, and “variable” isn’t a reserved word.

✅ Answer: (c) A name used to identify a variable, function, or class

An identifier is simply the name you give to a variable, function, class, or other object — like marks or calculate_total. It’s how you refer to things in your code.

✅ Answer: (b) 3.14

3.14 is a literal — a fixed value written directly into the code (here, a floating-point number). + is an operator, for is a keyword, and print() is a function call, not a literal value.

✅ Answer: (c) To perform operations on data

An operator (like +, -, ==, and) is a symbol used to perform operations on data — arithmetic, comparison, logical, and so on.

✅ Answer: (b) A special character used in Python syntax

A punctuator is a special character that plays a structural role in Python’s syntax — symbols like :, ,, (, ), [, and ].

✅ Answer: (a) Left value and right value

l-value stands for “left value” (the variable on the left side of an assignment, where a value is stored) and r-value stands for “right value” (the value or expression on the right side being assigned).

✅ Answer: (b) Using the # symbol

Python uses the # symbol to mark a single-line comment — everything after it on that line is ignored by the interpreter. (// and /* */ are comment styles from C-family languages, not Python.)

✅ Answer: (a) To store and manipulate data

Variables exist to store and manipulate data while a program runs — holding values that can be read, changed, and used in calculations or logic.

✅ Answer: (b) To represent the left-hand side of an assignment

An l-value represents the left-hand side of an assignment — the variable that will receive and store the value produced by the right-hand side (the r-value).

✅ Answer: (b) They provide explanations and improve code readability

Comments exist purely to provide explanations and improve code readability for humans reading the code. They are never executed by the interpreter and are completely optional — a program runs perfectly fine without any comments at all.