R Programming - Data Types MCQ Questions and Answers

In R programming, understanding data types is essential as they define the kind of data that can be stored in variables. R supports various data types, such as numeric, character, logical, and more, each serving a specific purpose in data manipulation and analysis.

This quiz will test your knowledge of R data types, helping you solidify your understanding of how to work with different types of data in R. Each question is followed by an explanation for better understanding.

Let’s begin with these multiple-choice questions (MCQs) to enhance your knowledge of R data types.

1. Which of the following is a numeric data type in R?

a) Integer

b) Logical

c) Character

d) Factor

Answer:

a) Integer

Explanation:

In R, Integer is considered a numeric data type, which stores whole numbers.

2. What function is used to check the data type of a variable in R?

a) typeof()

b) type()

c) datatype()

d) isType()

Answer:

a) typeof()

Explanation:

The typeof() function is used to determine the data type of a variable in R.

3. Which of the following is a valid logical value in R?

a) True

b) FALSE

c) Yes

d) On

Answer:

b) FALSE

Explanation:

In R, the valid logical values are TRUE and FALSE. Therefore, FALSE is correct.

4. Which of the following data types is used to store text in R?

a) Numeric

b) Logical

c) Character

d) Integer

Answer:

c) Character

Explanation:

The Character data type is used to store text values (strings) in R.

5. Which function is used to check if a variable is a factor in R?

a) is.factor()

b) is.numeric()

c) is.logical()

d) is.character()

Answer:

a) is.factor()

Explanation:

The is.factor() function checks if a variable is of type factor, which is used to handle categorical data in R.

6. What is the default type of data stored in R when a decimal number is assigned to a variable?

a) Integer

b) Numeric

c) Logical

d) Character

Answer:

b) Numeric

Explanation:

By default, R stores decimal numbers as Numeric values, which represent floating-point numbers.

7. How do you convert a numeric variable to a character in R?

a) as.numeric()

b) as.logical()

c) as.character()

d) as.integer()

Answer:

c) as.character()

Explanation:

The as.character() function converts a numeric variable to a character (string) in R.

8. Which of the following is a valid data structure in R?

a) String

b) Array

c) Vector

d) Dictionary

Answer:

c) Vector

Explanation:

Vector is a fundamental data structure in R used to store elements of the same data type.

9. How do you convert a factor to a numeric data type in R?

a) as.factor()

b) as.numeric()

c) as.character()

d) as.logical()

Answer:

b) as.numeric()

Explanation:

The as.numeric() function is used to convert factors to numeric data types in R.

10. Which of the following is used to store TRUE/FALSE values in R?

a) Integer

b) Logical

c) Character

d) Factor

Answer:

b) Logical

Explanation:

The Logical data type is used to store boolean values (TRUE/FALSE) in R.

Conclusion

These questions cover key aspects of data types in R, including how to identify, convert, and use them effectively. Having a strong understanding of data types will improve your ability to work with R and help you write more efficient code. Keep practicing to master data types in R.