Concept-wise Practice

bells MCQ Questions for Class 10

bells se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

1 questions tagged with bells.

Question 1/1 Hard Mathematics Real Numbers 4: HCF and LCM using prime factorisation Class 10 Level 10

तीन घंटियाँ क्रमशः (18), (24) और (30) मिनट के अंतराल पर बजती हैं। यदि वे साथ बजना शुरू करती हैं, तो फिर से साथ कितने मिनट बाद बजेंगी?

Three bells ring at intervals of (18), (24), and (30) minutes. If they start ringing together, after how many minutes will they ring together again?

Explanation opens after your attempt
Correct Answer

D. (360)

Step 1

Concept

The time when they ring together again is the LCM of (18), (24), and (30).

Step 2

Why this answer is correct

\(18=2\times 3^2\), \(24=2^3\times 3\), \(30=2\times 3\times 5\). The LCM is \(2^3\times 3^2\times 5=360\).

Step 3

Exam Tip

Use LCM for repeated-time meeting problems. चरण 1: साथ दोबारा बजने का समय (18), (24), और (30) का लघुत्तम समापवर्त्य होगा। चरण 2: \(18=2\times 3^2\), \(24=2^3\times 3\), \(30=2\times 3\times 5\)। लघुत्तम समापवर्त्य \(2^3\times 3^2\times 5=360\) है। चरण 3: दोहराव वाले समय प्रश्नों में लघुत्तम समापवर्त्य लगाएँ।

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