Class 7 Mathematics Chapter 1: Geometric Twins — practice questions with answers
Free practice for Class 7 Mathematics, Chapter 1: Geometric Twins. Try the solved questions below, then take a free test with instant marking and explanations.
28 questions9 easy, 11 medium, 8 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. The signboard symbol has arms AB = 4 cm and BC = 8 cm. What else must be known to recreate it exactly?
- The angle ∠ABC
- The colour
- The thickness of the board
- Nothing else
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Answer: A. The angle ∠ABC
Why: Different angles give different shapes; the two arm lengths and ∠ABC fix the figure. [p.2]
Why: Different angles give different shapes; the two arm lengths and ∠ABC fix the figure. [p.2]
Q2. Figures that have the same shape and size are called ______.
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Answer: congruent
Why: Congruent figures can be superimposed exactly. [p.2]
Why: Congruent figures can be superimposed exactly. [p.2]
Q3. Meera says the three side lengths of a triangle are enough to make an exact copy. Is she right?
- Yes — triangles with the same side lengths are congruent (SSS)
- No — angles are always needed
- Only for equilateral triangles
- Only if the sides are in cm
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Answer: A. Yes — triangles with the same side lengths are congruent (SSS)
Why: If two triangles have the same side lengths, they are congruent — the SSS condition. [p.5–6]
Why: If two triangles have the same side lengths, they are congruent — the SSS condition. [p.5–6]
Q4. What does ‘SSS’ stand for?
- Side Side Side
- Same Shape Size
- Side Size Shape
- Straight Side Segment
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Answer: A. Side Side Side
Why: SSS = Side Side Side. [p.6]
Why: SSS = Side Side Side. [p.6]
Q5. What does the SAS condition require?
- Two sides and the angle between them equal
- Two sides and any angle equal
- Three angles equal
- One side and two angles in any order
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Answer: A. Two sides and the angle between them equal
Why: SAS: two sides and the included angle; it guarantees congruence. [p.10, p.22]
Why: SAS: two sides and the included angle; it guarantees congruence. [p.10, p.22]
Q6. In ΔABC, ∠A = 35° and ∠C = 75°. What is ∠B (degrees)?
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Answer: 70 (± 0)
Why: ∠B = 180 − 110 = 70°. [p.15]
Why: ∠B = 180 − 110 = 70°. [p.15]
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Frequently asked questions
How many practice questions are there for Class 7 Mathematics Chapter 1: Geometric Twins?
28 questions (9 easy, 11 medium, 8 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 7 Mathematics syllabus, used by CBSE and many state boards.