**1. Which of the following represents a constant?**

a) x

b) y

c) π

d) z

**Answer:** c) π (pi)

**Explanation:** π is a mathematical constant representing the ratio of a circle's circumference to its diameter. It is a fixed value and does not change.

**2. What does a variable represent?**

a) A fixed value

b) An unknown quantity that can change

c) A mathematical operation

d) A constant value

**Answer:** b) An unknown quantity that can change

**Explanation:** Variables are symbols or letters used to represent unknown values or quantities that can vary. They are not fixed and can take on different values.

**3. In the equation 5x + 9 = 22, what does “x” represent?**

a) A constant

b) A variable

c) A mathematical operation

d) A known value

**Answer:** b) A variable

**Explanation:** In the equation, “x” represents an unknown quantity that we need to determine. It is a variable because its value can vary.

**4. Which of the following is a variable in the expression 2a + 5b + 13?**

a) 2

b) a

c) 5

d) 13

**Answer:** a) 2

**Explanation:** In the expression, both “a” and “b” represent variables. They are letters used to represent unknown quantities that can change. Therefore, the required answer is “a”.

**5. What role does a constant play in mathematical calculations?**

a) It represents an unknown value.

b) It changes throughout the calculation.

c) It provides stability and consistency.

d) It is denoted by letters or symbols.

**Answer:** c) It provides stability and consistency

**Explanation:** Constants are fixed values that remain unchanged throughout a mathematical calculation. They ensure that specific relationships or properties hold and provide a reference point for calculations.

**1. In the equation y = 2x + 5, what does “y” represent?**

a) Constant

b) Variable

c) Mathematical operation

d) Known value

**Answer:** b) Variable

**2. Which of the following is a variable in the expression 4x – 3y = 10?**

a) 4

b) 10

c) -3

d) y

**Answer:** d) y

**3. What does a constant value indicate?**

a) It changes frequently

b) It is unknown

c) It remains fixed throughout

d) It depends on other variables

**Answer:** c) it remains fixed throughout

**4. Which of the following is an example of a variable?**

a) The value of “π”

b) The number “7”

c) A fixed quantity

d) The letter “z”

**Answer:** d) The letter “z”

**5. Which of the following is a constant in the equation y = 2x + b?**

a) y

b) 2

c) x

d) b

**Answer:** b) 2

**6. What role does a variable play in mathematical modelling?**

a) It represents a fixed value

b) It establishes standardized values

c) It allows for generalization and flexibility

d) It provides stability and consistency

**Answer:** c) It allows for generalization and flexibility

**7. Which of the following is an example of a constant term in a polynomial expression?**

a) 3x^{2}

b) 5

c) 2x

d) 7x^{3}

**Answer:** b) 5

**8. In the equation y = ax ^{2} + bx + c, which of the following options contain constants?**

a) a, b, c

b) x^{2}

c) y

d) x

**Answer:** a) a, b, c

**9. Which of the following is a variable in the equation 2πr = 10?**

a) π

b) r

c) 2

d) 10

**Answer:** b) r

**10. In the expression 3x + 5 = 20, what does "x" represent?**

a) A constant

b) A variable

c) An operation

d) A known value

**Answer:** b) A variable

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