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QUIZARD
QUIZARD
JEE MAIN 2026 Crash Course
NEET 2026 Crash Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
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निम्नलिखित में से कौन-से एक वायु में ध्वनि - तरंगो उत्पादित नहीं होता ?
A. ध्रुवण
B. विवर्तन
C. परावर्तन
D. अपवर्तन

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