Civil Services MPPSC State Service Prelims Mock Tests 2025 General Science Physics Measuring Instruments

दूध का घनत्व किसके द्वारा मापा जाता है:

1
लैक्टोमीटर 
2
हाइड्रोमीटर
3
बैरोमीटर
4
हाइग्रोमीटर 
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