CBSE Class 8 Mathematics · Ch 4: Quadrilaterals
CBSE Class 8 Mathematics · Ch 4: Quadrilaterals is an online chapter test in the CBSE Class 8 pattern, covering Quadrilaterals. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Quadrilaterals | 30 |
Difficulty: 8 medium · 22 hard
Quadrilaterals MCQ questions with answers
The first 3 of 30 questions. Unlock the series for the rest, each with a solution.
Q1. In parallelogram ABCD, diagonal $AC$ bisects $\angle A$. What can definitely be concluded about ABCD?
समांतर चतुर्भुज ABCD में, विकर्ण $AC$, $\angle A$ को समद्विभाजित करता है। ABCD के बारे में निश्चित रूप से क्या निष्कर्ष निकाला जा सकता है?
- A. ABCD must be a trapezium / ABCD अवश्य ही समलंब होगा
- B. ABCD must be a rectangle / ABCD अवश्य ही आयत होगा
- C. ABCD must be a rhombus / ABCD अवश्य ही समचतुर्भुज होगा
- D. ABCD must be a square / ABCD अवश्य ही वर्ग होगा
Solution
Since $AB \parallel DC$, the bisected angle gives $\angle DAC = \angle DCA$ by alternate angles, making triangle $ADC$ isosceles with $AD = DC$; combined with opposite sides being equal, all four sides become equal, so ABCD must be a rhombus.
चूँकि $AB \parallel DC$ है, समद्विभाजित कोण एकांतर कोणों द्वारा $\angle DAC = \angle DCA$ देता है, जिससे त्रिभुज $ADC$ समद्विबाहु बनता है और $AD = DC$ होता है; सम्मुख भुजाओं के बराबर होने के साथ मिलकर, चारों भुजाएँ बराबर हो जाती हैं, इसलिए ABCD अवश्य ही एक समचतुर्भुज होगा।
Q2. The angles of quadrilateral ABCD are $(3x-10)°$, $(2x+20)°$, $(4x-20)°$ and $(x+30)°$. What is the measure of the largest angle?
चतुर्भुज ABCD के कोण $(3x-10)°$, $(2x+20)°$, $(4x-20)°$ और $(x+30)°$ हैं। सबसे बड़े कोण का माप क्या है?
- A. $88°$
- B. $92°$
- C. $64°$
- D. $116°$
Solution
Using the angle sum property, $(3x-10)+(2x+20)+(4x-20)+(x+30)=360°$ gives $10x+20=360°$, so $x=34$; the largest angle is $4x-20=116°$.
कोण योग गुणधर्म का उपयोग करने पर, $(3x-10)+(2x+20)+(4x-20)+(x+30)=360°$ से $10x+20=360°$ प्राप्त होता है, जिससे $x=34$; सबसे बड़ा कोण $4x-20=116°$ है।
Q3. Consider the following statements: (i) A square is a rhombus, but a rhombus need not be a square. (ii) A rectangle is a parallelogram, but a parallelogram need not be a rectangle. (iii) A kite is always a parallelogram. Which of these statements is/are correct?
निम्नलिखित कथनों पर विचार करें: (i) एक वर्ग एक समचतुर्भुज है, लेकिन समचतुर्भुज का वर्ग होना आवश्यक नहीं है। (ii) एक आयत एक समांतर चतुर्भुज है, लेकिन समांतर चतुर्भुज का आयत होना आवश्यक नहीं है। (iii) एक पतंग (kite) सदैव समांतर चतुर्भुज होता है। इनमें से कौन-सा/से कथन सही है/हैं?
- A. (i) and (ii) only / केवल (i) और (ii)
- B. (ii) and (iii) only / केवल (ii) और (iii)
- C. (i), (ii) and (iii) / (i), (ii) और (iii)
- D. (i) only / केवल (i)
Solution
A square and rectangle are special cases of a rhombus and parallelogram respectively, so (i) and (ii) are correct; a kite's opposite sides need not be parallel, so (iii) is false.
वर्ग और आयत क्रमशः समचतुर्भुज और समांतर चतुर्भुज की विशेष स्थितियाँ हैं, इसलिए (i) और (ii) सही हैं; पतंग की सम्मुख भुजाओं का समांतर होना आवश्यक नहीं है, इसलिए (iii) गलत है।
Frequently asked questions
How many questions are in the CBSE Class 8 Mathematics · Ch 4: Quadrilaterals?
30 questions for 30 marks, to be answered in 20 minutes.
Is there negative marking in the CBSE Class 8 Mathematics · Ch 4: Quadrilaterals?
No — wrong answers are not penalised in this test.
Which topics does the CBSE Class 8 Mathematics · Ch 4: Quadrilaterals cover?
Quadrilaterals (30 questions).
Is the CBSE Class 8 Mathematics · Ch 4: Quadrilaterals free?
It is part of the CBSE Class 8 Test Series 2027 — Chapter-wise + Full Tests (42 tests, ₹99). You can first try English · Ch 1: The Wit that Won Hearts for free.
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