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

Question 1

Order the steps to write a for loop that iterates over a range of numbers.

Accepted Answer

Start with 'for', then variable name, then 'in', then range() with start, stop, step, then colon, then indented loop body. The correct order is to write 'for', then the loop variable, then 'in', then the range() function with appropriate arguments, then a colon, and finally an indented block containing the statements to repeat. This structure defines a for loop that iterates over a sequence generated by range().

Answer

Start with range(), then 'for', then variable name, then 'in', then colon, then indented loop body

Answer

Start with 'for', then variable name, then colon, then 'in', then range(), then indented loop body

Answer

Start with 'for', then 'in', then variable name, then range(), then colon, then indented loop body

Question 2

Order the steps to debug a Python script using print statements.

Accepted Answer

1. Insert print statements, 2. Run the script, 3. Analyze the output, 4. Remove print statements. Debugging with print involves inserting prints, running, analyzing, and cleaning up.

Answer

1. Insert print statements, 2. Remove print statements, 3. Run the script, 4. Analyze the output

Answer

1. Run the script, 2. Insert print statements, 3. Analyze the output, 4. Remove print statements

Answer

1. Analyze the output, 2. Insert print statements, 3. Run the script, 4. Remove print statements

Question 3

Match each Python operator to its description.

Accepted Answer

+: Addition. These are common operators in Python for arithmetic and comparison. The correct matches are: + for addition, * for multiplication, // for floor division, % for modulus.

Answer

+: Multiplication

Answer

//: Modulus

Question 4

Match each Python data structure to its characteristic.

Accepted Answer

List: mutable, ordered, allows duplicates. Python data structures have distinct properties: lists and tuples are ordered sequences (lists mutable, tuples immutable); sets are unordered and contain unique elements; dictionaries map keys to values. Common confusions include mixing mutability/order between lists and tuples, and assuming sets maintain order.

Answer

List: immutable and ordered

Answer

Set: ordered collection of elements

Question 5

Match each Python control flow statement to its purpose.

Accepted Answer

break: Exits the loop immediately.. The correct matches: break exits the loop, continue skips to next iteration, pass does nothing, else runs after normal loop completion. Common confusions include swapping break and continue, or confusing else with pass.

Answer

break: Skips the rest of the current iteration and moves to the next.

Answer

else (in loop): Does nothing; used as a placeholder.

Question 6

Which of the following is a valid Python variable name?

Accepted Answer

_var. (_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 7

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

Accepted Answer

3. 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 8

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 9

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

Accepted Answer

8. 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 10

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

Accepted Answer

8. 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 11

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 12

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 13

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 14

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

Accepted Answer

Hel. 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 15

Which TWO of the following are valid Python variable names?

Accepted Answer

_count. (_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