Bihar Board Class 8 Mathematics · Ch 4: Quadrilaterals
Bihar Board Class 8 Mathematics · Ch 4: Quadrilaterals is an online chapter test in the Bihar Board 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: 7 medium · 23 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 $ABCD$, adjacent angles $\angle A = (3x+10)°$ and $\angle B = (2x+5)°$. Find the value of $x$.
समांतर चतुर्भुज $ABCD$ में, आसन्न कोण $\angle A = (3x+10)°$ और $\angle B = (2x+5)°$ हैं। $x$ का मान ज्ञात करें।
- A. $35$
- B. $28$
- C. $30$
- D. $33$
Solution
Adjacent angles of a parallelogram are supplementary, so $(3x+10)+(2x+5)=180$, giving $5x+15=180$ and $x=33$.
समांतर चतुर्भुज के आसन्न कोण संपूरक होते हैं, इसलिए $(3x+10)+(2x+5)=180$, जिससे $5x+15=180$ और $x=33$ प्राप्त होता है।
Q2. In a kite, two pairs of adjacent sides are equal. Which pair of angles of the kite are equal to each other?
एक पतंग (kite) में, आसन्न भुजाओं के दो युग्म समान होते हैं। पतंग के किस युग्म के कोण एक-दूसरे के समान होते हैं?
- A. The two angles between the unequal sides. / असमान भुजाओं के बीच के दो कोण।
- B. All four angles of the kite. / पतंग के सभी चार कोण।
- C. No two angles of a kite are ever equal. / पतंग के किसी भी दो कोण कभी समान नहीं होते।
- D. The two angles between the equal sides. / समान भुजाओं के बीच के दो कोण।
Solution
In a kite, the angles formed where one long side meets one short side (the unequal sides) are equal, while the angles between the pairs of equal sides are generally different.
पतंग में, जहाँ एक लंबी भुजा एक छोटी भुजा से मिलती है (असमान भुजाओं के बीच बने कोण) वे कोण समान होते हैं, जबकि समान भुजाओं के युग्मों के बीच के कोण सामान्यतः भिन्न होते हैं।
Q3. A polygon has $9$ sides. How many diagonals can be drawn from a single vertex of this polygon?
एक बहुभुज की $9$ भुजाएँ हैं। इस बहुभुज के किसी एक शीर्ष से कितने विकर्ण खींचे जा सकते हैं?
- A. $9$
- B. $7$
- C. $6$
- D. $5$
Solution
From one vertex of an $n$-sided polygon, $(n-3)$ diagonals can be drawn. For $n=9$, this gives $9-3=6$.
किसी $n$ भुजाओं वाले बहुभुज के एक शीर्ष से $(n-3)$ विकर्ण खींचे जा सकते हैं। $n=9$ के लिए, यह $9-3=6$ देता है।
Frequently asked questions
How many questions are in the Bihar Board Class 8 Mathematics · Ch 4: Quadrilaterals?
30 questions for 30 marks, to be answered in 20 minutes.
Is there negative marking in the Bihar Board Class 8 Mathematics · Ch 4: Quadrilaterals?
No — wrong answers are not penalised in this test.
Which topics does the Bihar Board Class 8 Mathematics · Ch 4: Quadrilaterals cover?
Quadrilaterals (30 questions).
Is the Bihar Board Class 8 Mathematics · Ch 4: Quadrilaterals free?
It is part of the BSEB Class 8 Test Series 2027 — Chapter-wise + Full Tests (42 tests, ₹99). You can first try English · Ch 1: I Wonder for free.
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