Chapter 2: Introduction to Algebra — Online MCQ Test
MATHS · Samacheer Kalvi 6th · Tamil Nadu State Board
Practice Chapter 2: Introduction to Algebra with a free chapter-wise online MCQ test.
This chapter covers: Variables, Constants, Patterns, Algebraic expressions, Basic equations.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 2: Introduction to Algebra — Important Questions & Answers
What is a variable in algebra?
- A. A symbol that represents a fixed number
- B. A symbol that represents an unknown or changing number
- C. A number written in a mathematical expression
- D. The answer to an equation
Answer: B. A symbol that represents an unknown or changing number
A variable is a symbol (usually a letter) that represents an unknown or changing quantity in algebra.
A variable is a symbol (usually a letter) that represents an unknown or changing quantity in algebra.
Which of the following is a constant?
- A. x
- B. y
- C. 5
- D. a
Answer: C. 5
A constant is a fixed value that does not change, whereas x, y, and a are variables representing unknown quantities.
A constant is a fixed value that does not change, whereas x, y, and a are variables representing unknown quantities.
If x = 5, what is the value of 2x + 3?
- A. 8
- B. 10
- C. 13
- D. 15
Answer: C. 13
Substituting x = 5: 2(5) + 3 = 10 + 3 = 13.
Substituting x = 5: 2(5) + 3 = 10 + 3 = 13.
If a = 2, find the value of a² + 3a.
- A. 8
- B. 10
- C. 12
- D. 14
Answer: B. 10
Substituting a = 2: (2)² + 3(2) = 4 + 6 = 10.
Substituting a = 2: (2)² + 3(2) = 4 + 6 = 10.
A shopkeeper has n apples. He buys 15 more apples. Write an expression for the total number of apples. If n = 30, how many apples does he have now?
- A. n + 15 = 35
- B. n + 15 = 45
- C. n - 15 = 15
- D. n × 15 = 450
Answer: B. n + 15 = 45
Total apples = n + 15. When n = 30: 30 + 15 = 45 apples.
Total apples = n + 15. When n = 30: 30 + 15 = 45 apples.