R Programming - Operators MCQ Questions and Answers

Operators in R are essential for performing arithmetic, logical, and relational operations on variables and data. R provides several types of operators, such as arithmetic, relational, logical, and assignment operators, to handle different types of computations.

This quiz will test your knowledge of R operators, helping you understand how to perform basic and complex operations. Each question includes an explanation to provide a clear understanding of the concepts.

Let’s begin with these multiple-choice questions (MCQs) to enhance your understanding of R operators.

1. Which of the following is an arithmetic operator in R?

a) ==

b) *

c) &&

d) |

Answer:

b) *

Explanation:

The * operator is used for multiplication, which is an arithmetic operation in R.

2. Which of the following is a relational operator in R?

a) +

b) ==

c) %%

d) ˆ

Answer:

b) ==

Explanation:

The == operator checks if two values are equal, making it a relational operator in R.

3. What is the result of the expression 5 %% 2 in R?

a) 1

b) 0

c) 2

d) 5

Answer:

a) 1

Explanation:

The %% operator returns the remainder of the division, so 5 %% 2 equals 1.

4. Which operator is used to raise a number to a power in R?

a) ˆ

b) %/%

c) *

d) +

Answer:

a) ˆ

Explanation:

The ˆ operator is used in R to raise a number to the power of another number.

5. How do you check if two variables are not equal in R?

a) !=

b) ==

c) |

d) &&

Answer:

a) !=

Explanation:

The != operator checks if two variables are not equal in R.

6. Which of the following is a logical operator in R?

a) *

b) |

c) ==

d) %/%

Answer:

b) |

Explanation:

The | operator is a logical operator used for OR operations in R.

7. What does the %% operator do in R?

a) Integer division

b) Modulus (remainder)

c) Exponentiation

d) Multiplication

Answer:

b) Modulus (remainder)

Explanation:

The %% operator returns the remainder of the division in R.

8. What is the result of 3ˆ2 in R?

a) 9

b) 6

c) 8

d) 12

Answer:

a) 9

Explanation:

The ˆ operator raises 3 to the power of 2, resulting in 9.

9. What does the operator || do in R?

a) Logical OR with element-wise comparison

b) Logical AND

c) Logical OR with short-circuiting

d) Logical XOR

Answer:

c) Logical OR with short-circuiting

Explanation:

The || operator is a logical OR operator in R with short-circuiting, meaning it evaluates only the first element of the condition.

10. What is the difference between && and & in R?

a) Both are the same

b) && is for element-wise comparison, and & is for logical AND

c) & is for element-wise comparison, and && is for logical AND

d) && is faster than &

Answer:

c) & is for element-wise comparison, and && is for logical AND

Explanation:

In R, & performs element-wise comparison, while && evaluates the first element only in a logical AND operation.

11. Which of the following is the correct operator for integer division in R?

a) %/%

b) %%

c) //

d) ˆ

Answer:

a) %/%

Explanation:

The %/% operator in R performs integer division, returning the quotient of the division.

12. How do you assign a value to a variable in R?

a) ==

b) =

c) ←

d) →

Answer:

c) ←

Explanation:

The ← operator is the most common way to assign a value to a variable in R.

13. What is the result of the expression 6 %/% 4 in R?

a) 2

b) 1

c) 3

d) 4

Answer:

b) 1

Explanation:

The %/% operator performs integer division, so 6 %/% 4 results in 1 (as the remainder is discarded).

14. What does the operator ! do in R?

a) Negates a logical value

b) Performs logical AND

c) Multiplies two numbers

d) Divides two numbers

Answer:

a) Negates a logical value

Explanation:

The ! operator in R is a logical negation operator, reversing the logical value.

15. Which operator is used to check if a value is less than or equal to another value in R?

a) <

b) ==

c) <=

d) >=

Answer:

c) <=

Explanation:

The <= operator checks if a value is less than or equal to another value in R.

These questions help you understand the different types of operators in R, such as arithmetic, relational, and logical operators. Gaining proficiency in using these operators will improve your ability to manipulate data in R. Keep practicing to strengthen your understanding of operators in R.