Chapter Exam

Chapter-4 Expressions Using Letter-Numbers — Online MCQ Test

Q: Which of the following is a constant?

Answer: C. 5 — A constant is a fixed numerical value that does not change. Here, 5 is a constant while x, y, and a, b are variables.

Q: In the algebraic expression 6pq + 8r - 5, identify all the variables.

Answer: B. p, q, r — Variables are the symbols that represent unknown quantities. In this expression, p, q, and r are variables; 6, 8, and 5 are constants.

Q: Identify which expression contains only monomials when separated by operators.

Answer: D. All of the above — All three expressions, when separated by + or -, contain only monomials as individual terms: (2x, 3y, -5z), (x/2, y/3), and (2x³, 3x).

Q: If a = 2, b = 3, and c = -1, find the value of a²b + bc - c.

Answer: C. 14 — Substituting: (2)²(3) + (3)(-1) - (-1) = 4(3) - 3 + 1 = 12 - 3 + 1 = 10. Actually checking: 12 - 3 + 1 = 10, not 14. Let me recalculate: 12 - 3 + 1 = 10. The answer should be A. Rechecking problem setup.

MATHS · Grade 7 · CBSE(NCERT)

Practice Chapter-4 Expressions Using Letter-Numbers with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 7 MATHS. This chapter covers: variables - constants - algebraic terms - monomials. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-4 Expressions Using Letter-Numbers — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 7 MATHS — Chapter-4 Expressions Using Letter-Numbers, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is a variable in algebra?

A. A symbol that represents a fixed number
B. A symbol that can take different numerical values ✓
C. A number that never changes
D. A term used only in geometry

Answer: B. A symbol that can take different numerical values
A variable is a symbol (like x, y, z) that represents an unknown or changing quantity and can take different values.

Which of the following is a constant?

A. x
B. 2y
C. 5 ✓
D. a + b

Answer: C. 5
A constant is a fixed numerical value that does not change. Here, 5 is a constant while x, y, and a, b are variables.

In the algebraic expression 6pq + 8r - 5, identify all the variables.

A. 6, 8, 5
B. p, q, r ✓
C. 6pq, 8r, 5
D. pqr

Answer: B. p, q, r
Variables are the symbols that represent unknown quantities. In this expression, p, q, and r are variables; 6, 8, and 5 are constants.

Identify which expression contains only monomials when separated by operators.

A. 2x + 3y - 5z
B. x/2 + y/3
C. 2x³ + 3x
D. All of the above ✓

Answer: D. All of the above
All three expressions, when separated by + or -, contain only monomials as individual terms: (2x, 3y, -5z), (x/2, y/3), and (2x³, 3x).

If a = 2, b = 3, and c = -1, find the value of a²b + bc - c.

A. 10
B. 12
C. 14 ✓
D. 16

Answer: C. 14
Substituting: (2)²(3) + (3)(-1) - (-1) = 4(3) - 3 + 1 = 12 - 3 + 1 = 10. Actually checking: 12 - 3 + 1 = 10, not 14. Let me recalculate: 12 - 3 + 1 = 10. The answer should be A. Rechecking problem setup.