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Lucent science topic-8 डॉप्लर_प्रभाव #sound physics bpsc_tre_4
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Lucent science topic-9 ऊष्मा Heat physics bpsc tre 4 bpsc educational video science
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Lucent science topic-17 प्रकाशीय यंत्र (physics)
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Lucent science topic-18 विद्युत ,विद्युत धारा ,AC current, DC current
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