PCEP Data Types, Variables, Basic I/O and Operators Practice Test 4 — 15 Questions

Question 1

Match each Python data structure to its characteristic.

Question 2

Match each Python control flow statement to its purpose.

Question 3

Which of the following is a valid Python variable name?

Accepted Answer

_var. Option B (_var) is correct because Python variable names must start with a letter or an underscore, and can contain letters, digits, or underscores. The underscore is a valid starting character, making _var a legal identifier.

Answer

2var

Answer

my-var

Answer

var$name

Question 4

A program uses 'x = 3.14' and 'y = int(x)'. What is the value of y?

Accepted Answer

3. The correct answer is D because the int() function in Python truncates the decimal part of a float, converting 3.14 to the integer 3. It does not round to the nearest whole number.

Answer

4

Answer

3.14

Answer

Error

Question 5

Given 'a = 10; b = 3; c = a // b; d = a % b', what is the value of c + d?

Accepted Answer

4. In Python, the // operator performs floor division, so a // b = 10 // 3 = 3. The % operator returns the remainder, so a % b = 10 % 3 = 1. Therefore, c + d = 3 + 1 = 4, making option A correct.

Answer

5

Answer

7

Answer

6

Question 6

What does 'print(2 ** 3)' output?

Accepted Answer

8. Option C is correct because the ** operator in Python performs exponentiation, raising the left operand (2) to the power of the right operand (3), which equals 8. The print() function then outputs this integer result to the console.

Answer

9

Answer

23

Answer

6

Question 7

After 'x = 5; x += 3', what is the value of x?

Accepted Answer

8. The correct answer is B because the compound assignment operator `+=` adds the right operand to the current value of the variable and assigns the result back. Starting with `x = 5`, the statement `x += 3` is equivalent to `x = x + 3`, which computes `5 + 3 = 8` and stores it in `x`.

Answer

5

Answer

3

Answer

15

Question 8

What is the result of 'bool(0) and bool(1)'?

Accepted Answer

False. The expression `bool(0) and bool(1)` evaluates to `False` because `bool(0)` converts the integer 0 to `False` (since 0 is falsy in Python), and `bool(1)` converts 1 to `True`. The `and` operator returns `True` only if both operands are truthy; here, `False and True` yields `False`.

Answer

True

Answer

1

Answer

0

Question 9

Which function is used to read user input as a string?

Accepted Answer

input(). The `input()` function is the correct answer because it is the built-in Python function specifically designed to read a line of text from the user via standard input (stdin). It always returns the input as a string, regardless of whether the user types digits or other characters, making it the standard tool for console input in Python.

Answer

read()

Answer

scan()

Answer

get()

Question 10

What is the output of 'print(3 * "ab")'?

Accepted Answer

ababab. In Python, the multiplication operator (*) when used with a string and an integer performs string repetition. The expression 3 * "ab" repeats the string "ab" three times, concatenating the copies into a single string "ababab". The print() function then outputs this resulting string to the console.

Answer

ab3

Answer

3ab

Answer

Error

Question 11

Given 's = "Hello"; t = s[0:3]; print(t)', what is the output?

Accepted Answer

Hel. Option D is correct because string slicing in Python uses the syntax `s[start:stop]`, where the stop index is exclusive. For `s = "Hello"`, `s[0:3]` extracts characters from index 0 up to but not including index 3, resulting in indices 0 ('H'), 1 ('e'), and 2 ('l'), giving the substring "Hel".

Answer

ello

Answer

H

Answer

Hell

Question 12

Which TWO of the following are valid Python variable names?

Accepted Answer

_count. Option A (_count) is correct because Python allows variable names to start with an underscore, and it contains only letters, underscores, and digits. Underscore-prefixed names are commonly used for internal or private variables, but they are syntactically valid.

Answer

var-name

Answer

2nd_var

Answer

var name

Question 13

Which THREE of the following are Python built-in data types?

Accepted Answer

bool. Option B is correct because `bool` is a built-in data type in Python, used to represent Boolean values `True` and `False`. It is a subclass of `int` and is fundamental for logical operations and conditional expressions.

Answer

array

Answer

char

Question 14

Which TWO operators in Python yield an integer result when applied to two integers?

Accepted Answer

//. The floor division operator (//) always returns an integer result when both operands are integers, discarding any fractional part. For example, 7 // 2 yields 3, not 3.5. This is because floor division performs integer division and truncates toward negative infinity, ensuring the result type is int when both inputs are int.

Answer

**

Answer

*

Answer

/

Question 15

Refer to the exhibit. What is the cause of the error?

Accepted Answer

Using + on incompatible types (str and int). The error occurs because the `+` operator is being used between a string and an integer, which are incompatible types in Python. Python does not implicitly convert the integer to a string for concatenation; it raises a `TypeError: unsupported operand type(s) for +: 'str' and 'int'`.

Answer

Division by zero

Answer

Missing import statement

Answer

Variable not defined