variables and assignments quiz (mcqs)

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Variables and Assignments

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The variable age is to be used to represent a person’s age, in years. Which of the following is the most appropriate data type for age ?

The variable is Open is to be used to indicate whether or not a store is currently open. Which of the following is the most appropriate data type for isOpen ?

Consider the following code segment.

What is the value of r as a result of executing the code segment?

What are the values of first and second as a result of executing the code segment?

The value of first is true, and the value of second is true.

The value of first is true, and the value of second is false.

The value of first is false, and the value of second is true.

The value of first is false, and the value of second is false.

Which of the following is a benefit of using a list as a data abstraction in a program?

Lists often allow their size to be easily updated to hold as many data values as needed.

Lists convert all elements to strings so that they can be inspected character-by-character.

Lists prevent duplicate data values from appearing in the list.

Lists are used to store all input data so that there is a running record of all user input.

A programmer has a need to round many numeric values to the nearest integer. Which of the following best explains the benefit of using a list as a data abstraction in this situation?

Keeping the numeric values in a list makes it easier to round a number to the nearest integer.

Keeping the numeric values in a list makes it easier to apply the same computation to every data element.

Keeping the numeric values in a list makes it easier to prevent a program from unintentionally changing the value of a variable.

Keeping the numeric values in a list makes it easier to prevent a program from attempting to access an index beyond the length of the list.

Assume that both lists and strings are indexed starting with index 1.

The list wordList has the following contents.

["abc", "def", "ghi", "jkl"]

Let myWord be the element at index 3 of wordList. Let myChar be the character at index 2 of myWord. What is the value of myChar ?

What are the contents of yourList after the code segment is executed?

[10, 30, 50, 70]

[20, 40, 60, 80]

[10, 30, 50, 70, 20, 40, 60, 80]

[20, 40, 60, 80, 10, 30, 50, 70]

Item 5Consider the following code segment.

firstList ← ["guitar", "drums", "bass"]

secondList ← ["flute", "violin"]

thirdList ← [ ]

thirdList ← firstList

firstList ← secondList

secondList ← thirdList

What are the contents of secondList after the code segment is executed?

["guitar", "drums", "bass"]

["flute", "violin"]

["flute", "violin", "guitar", "drums", "bass"]

The list wordList contains a list of 10 string values. Which of the following is a valid index for the list?

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An Adventure in Statistics: The Reality Enigma

Student resources, multiple choice questions.

Quizzes are available to test your understanding of the key concepts covered in each chapter. Click on the quiz below to get started.

1.    Which of the following best describes a confounding variable?

• A variable that is manipulated by the experimenter.
• A variable that has been measured using an unreliable scale.
• A variable that affects the outcome being measured as well as, or instead of, the independent variable.
• A variable that is made up only of categories.  

The correct answer is c) A variable that affects the outcome being measured as well as, or instead of, the independent variable. This is correct because a confounding variable is an unforeseen and unaccounted-for variable that jeopardizes reliability and validity of an experiment's outcome.

2.    A variable that measures the effect that manipulating another variable has is known as:

• A dependent variable
• A confounding variable
• A predictor variable
• An independent variable  

The correct answer a) A dependent variable. This is because a dependent variable (or outcome variable) is a variable that is thought to be affected by changes in an independent variable.

3.    A predictor variable is another name for:

• An independent variable
• A discrete variable  

The correct answer is b) An independent variable. An independent variable (or predictor variable) is a variable that is thought to be the cause of some effect. This term is usually used in experimental research to denote a variable that the experimenter has manipulated.

4.    The discrepancy between the numbers used to represent something that we are trying to measure and the actual value of what we are measuring is called:

• The ‘fit’ of the model
• Reliability
• Measurement error  

The correct answer is d) Measurement error. This is because, it’s one thing to measure variables, but it’s another thing to measure them accurately.

5.    What kind of variable is IQ, measured by a standard IQ test?

• Categorical

The correct answer is b) Continuous. A continuous variable is one for which, within the limits the variable ranges, any value is possible

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Home » Python

Python Variables MCQs

Python Variables MCQs : This section contains multiple-choice questions and answers on Python Variables. These MCQs are written for beginners as well as advanced, practice these MCQs to enhance and test the knowledge of Python Variables.

List of Python Variables MCQs

1. What are variables?

• Variables are used to identify the module, class i.e., entity
• Variables are the names we used to store the values
• Variables are special inbuilt names

Answer: B) Variables are the names we used to store the values.

Explanation:

Variables are the names we used to store the values; these are the user-defined names that are used to assign the values.

Discuss this Question

2. Can you include digits in defining a variable name?

Answer: A) Yes

Yes, variable names can include digits. Variables can include the group of characters and numbers.

3. Are variables names case-sensitive?

Yes, variable names are case-sensitive. A and a are two different variables.

4. What are identifiers?

• Identifiers are used to identify the module, class i.e., entity
• Identifiers are the names we used to store the values
• Identifiers are special inbuilt names

Answer: A) Identifiers are used to identify the module, class i.e., entity.

Identifiers are used to identify the module, class i.e., entity.

5. Can you include special characters as variable names?

Answer: B) No

No, variable names cannot contain special characters.

6. Which of the following is the valid variable name?

• True="hello"
• For="hello"
• Else="hello"

Answer: B) A="hello"

Among, all the given variables only option b is valid as other names are also keywords.

7. What are keywords?

• keywords are used to identify the module, class i.e., entity
• keywords are the names we used to store the values
• keywords are the special inbuilt names

Answer: C) keywords are the special inbuilt names.

Keywords are special inbuilt names.

8. Can you make keywords as variable names?

Keywords cannot be used as variable names. As keywords are the in-built names and if you will use them as the variable name you will get the error.

9. Which of the following is an invalid variable name?

• 100_ = 1000

Answer: B) 100_ = 1000

A variable name cannot start from a digit. It can start from the underscore.

10. How can you assign one value to different variables?

• a, b, c = 100
• a = b = c = 100
• a = b = c == 100

Answer: B) a = b = c = 100

a = b = c = 100 , this is how you can assign a single value to multiple variables.

11. Check whether the given statement is correct or not

a, b, c = 10, 12, 12 it is one of the methods to assign three different variables to three different values in a single line of code.

12. How many types of variables are there In Python

Answer: D) 2

In Python, there are two types of variables local variables and global variables.

13. ____ variable is the variable that is stored inside the function.

Answer: A) Local

In Python, the Local variable is the type of variable which are stored inside the function.

14. Can you use a local variable outside the function?

• Only in the special case

Answer: B) Java

In Python, Local variables cannot be used outside the function, if you will use them it will show you the name error.

15. ____ variables are the variables that can be used in the entire program.

Answer: A) Global

In Python, global variables are the variables that can be used all over the program.

16. Which keyword is used to assign a local variable?

• No, it has no keyword

Answer: C) No, it has no keyword.

In Python, Local variables are assigned directly no specified keywords are used with them.

17. Which keyword is used to assign a global variable?

Answer: A) global

In Python, the global keyword is used to define a global variable if you are making a global variable inside some function, else you don't require any keyword.

18. Can you delete the variable during a program?

In Python, you can easily delete the variable during a program, (if you don't want them).

19. Which keyword is used to delete the variable?

Answer: C) del

In Python, the del keyword is used to delete the variable during a program.

20. ____ are the smallest unit inside a program and can be defined as reserved words and each word in a statement?

• Preprocessor

Answer: D) Tokens

Tokens are the smallest unit inside a program and can be defined as reserved words and each word in a statement

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Search this blog, java variables quiz - mcq - multiple choice questions.

Java is one of the most popular programming languages in the world. If you're a beginner, it's crucial to understand the fundamentals of Java, and variables are a great place to start. Test your knowledge with this Java Variables Quiz consisting of 10 multiple-choice questions.

Each question is followed by the correct answer and an explanation to help reinforce your knowledge.

1. Which of the following is a valid variable declaration in Java?

Explanation:.

In Java, variable names cannot begin with numbers (option a), cannot have single quotes (option c), and type names are case-sensitive, meaning string is incorrect, it should be String (option d).

2. Which data type is used to store a single character in Java?

In Java, the char data type is used to store a single character.

3. How many bytes does an int data type occupy in Java?

In Java, an int data type occupies 4 bytes.

4. Which of the following is the correct way to declare multiple variables of the same type?

All the given options are valid ways to declare multiple variables in Java.

5. Which keyword in Java is used for constant variables?

In Java, the final keyword is used to declare constant variables.

6. What will be the default value of an int variable if not initialized in a class?

If an int variable is a member of a class and is not initialized, its default value is 0.

7. Which of the following is a valid variable name in Java?

Variable names in Java can contain letters, digits, underscores, and dollar signs. They cannot start with a digit or contain Java-reserved words like float.

8. The boolean data type in Java can have values:

The boolean data type in Java can only have the values true or false .

9. Which data type can be used to store large decimal numbers in Java?

The double data type is used to store large decimal numbers in Java.

This quiz should give beginners a basic understanding of Java variables. If you got all the answers correct, well done! If not, don't worry; practice makes perfect. Keep studying and practicing!

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Python Variables MCQ

In Python, variables are used to store data values. They are essentially labels that you can assign to data, and once a variable is set, you can refer to it by its name to access the value it represents. Here we present 15 multiple-choice questions to test your knowledge of Python variables. Each MCQ has the correct answer with an explanation.

1. Which of the following is a valid variable name in Python?

Explanation:.

In Python, variable names can start with a letter or an underscore, but not with a number. They can contain alphanumeric characters and underscores. "variable_name" is the only valid option.

2. How do you assign a value to a variable in Python?

In Python, the equal sign (=) is used to assign values to variables.

3. Which of the following is the correct way to declare a variable in Python?

Python uses dynamic typing, so you don't need to declare the variable type. The correct syntax is just variable_name = value.

4. What will be the data type of the variable 'x' after the assignment x = 5.0?

In Python, a number with a decimal point is considered a float, so x will be of type float.

5. What is the output of the following code?

The code uses multiple assignment where x is assigned 10 and y is assigned 20. The print statement only prints the value of x.

6. Which of the following is not a reserved keyword in Python?

"begin" is not a reserved keyword in Python, while the others are.

7. What happens when you try to use an undeclared variable in Python?

Using an undeclared variable in Python results in a NameError at runtime.

8. How do you check the type of a variable in Python?

The type() function is used to check the data type of a variable in Python.

9. What is the correct way to declare a global variable in Python?

To declare a global variable inside a function, you use the global keyword followed by the variable name.

10. What will be the output of the following code?

In Python, multiplying a string by an integer n repeats the string n times.

11. What is the result of this Python code?

The + operator concatenates strings without adding any spaces.

12. In Python, which of the following is a mutable data type?

Lists are mutable in Python, meaning their elements can be changed.

13. What is the correct way to delete a variable in Python?

The del statement is used to delete objects in Python.

14. What is the data type of a variable set to None in Python?

None is a special type in Python represented by NoneType.

15. What is the output of the following code?

The // operator in Python performs integer (floor) division.

Related MCQ (Multiple Choice Questions) :

Python file handling mcq, mcq on python oops, mcq on python data types, python strings mcq, python exception handling mcq, python operators mcq, python dictionary mcq, python mcq on functions, python mcq on lists, python mcq on loops, certified entry-level python programmer practice test, leave a comment cancel reply.

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Python Variables Quiz

Interactive Quiz ⋅ 9 Questions By John Sturtz

Test your understanding of Python variables and object references.

Take this quiz after reading our Variables in Python tutorial.

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