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Bihar Board Class 8 Mathematics · Ch 2: Power Play

Bihar Board Class 8 Mathematics · Ch 2: Power Play is an online chapter test in the Bihar Board Class 8 pattern, covering Power Play. 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.

30
Questions
20
Minutes
30
Marks
None
Negative marking
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Topics in this test

TopicQuestions
Power Play30

Difficulty: 7 medium · 23 hard

Power Play MCQ questions with answers

The first 3 of 30 questions. Unlock the series for the rest, each with a solution.

  1. Q1. Assertion (A): $(-3)^{-2}=\frac{1}{9}$. Reason (R): For any non-zero number $a$, $a^{-n}=\frac{1}{a^{n}}$. Choose the correct option:

    अभिकथन (A): $(-3)^{-2}=\frac{1}{9}$। कारण (R): किसी भी अशून्य संख्या $a$ के लिए, $a^{-n}=\frac{1}{a^{n}}$। सही विकल्प चुनिए:

    • A. Both A and R are true, but R is not the correct explanation of A / A और R दोनों सत्य हैं, परंतु R, A की सही व्याख्या नहीं है
    • B. Both A and R are true, and R is the correct explanation of A / A और R दोनों सत्य हैं, तथा R, A की सही व्याख्या है
    • C. A is false but R is true / A असत्य है परंतु R सत्य है
    • D. A is true but R is false / A सत्य है परंतु R असत्य है
    Solution

    $(-3)^{-2}=\frac{1}{(-3)^2}=\frac{1}{9}$, which is exactly what the law in R states, so R correctly explains A.

    $(-3)^{-2}=\frac{1}{(-3)^2}=\frac{1}{9}$, जो ठीक वही है जो R में दिया गया नियम कहता है, अतः R, A की सही व्याख्या करता है।

  2. Q2. The number $4.7\times10^{-4}$ written in the usual (decimal) form is:

    संख्या $4.7\times10^{-4}$ को सामान्य (दशमलव) रूप में लिखने पर प्राप्त होती है:

    • A. $47000$
    • B. $0.00047$
    • C. $0.000047$
    • D. $0.0047$
    Solution

    A power of $10^{-4}$ shifts the decimal point $4$ places to the left, giving $0.00047$.

    $10^{-4}$ की घात दशमलव बिंदु को $4$ स्थान बाईं ओर खिसकाती है, जिससे $0.00047$ प्राप्त होता है।

  3. Q3. If $5^{m}\div 5^{-3}=5^{5}$, then the value of $m$ is:

    यदि $5^{m}\div 5^{-3}=5^{5}$ है, तो $m$ का मान है:

    • A. $8$
    • B. $-8$
    • C. $-2$
    • D. $2$
    Solution

    Dividing with the same base subtracts powers: $m-(-3)=m+3=5$, so $m=2$.

    समान आधार से भाग देने पर घातें घटती हैं: $m-(-3)=m+3=5$, अतः $m=2$।

Frequently asked questions

How many questions are in the Bihar Board Class 8 Mathematics · Ch 2: Power Play?

30 questions for 30 marks, to be answered in 20 minutes.

Is there negative marking in the Bihar Board Class 8 Mathematics · Ch 2: Power Play?

No — wrong answers are not penalised in this test.

Which topics does the Bihar Board Class 8 Mathematics · Ch 2: Power Play cover?

Power Play (30 questions).

Is the Bihar Board Class 8 Mathematics · Ch 2: Power Play free?

It is part of the BSEB Class 8 Test Series 2027 — Chapter-wise + Full Tests (19 tests, ₹99). You can first try English · Ch 1: I Wonder for free.

More tests in the BSEB Class 8 Test Series 2027 — Chapter-wise + Full Tests

See the full BSEB Class 8 Test Series 2027 — Chapter-wise + Full Tests → · Bihar Board Class 8: pattern, notification & syllabus →

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Power Play MCQ Questions with Answers | Bihar Board Class 8 | SeatBeat