Question

Equal volumes of two different substancest
have equal masses.​

Answer 1

Answer : false

Would equal volumes of two different substances have the same or different masses?

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Different masses, almost always.

Consider a marble made of glass, and one made of plastic. Even if the marbles are identical sizes, the glass one will weigh more (on the same scale) and therefore must have more mass.

Or consider a liter of water and a liter of oil. Combine the two in a large pot and stir all you want, but they will soon separate—the oil will float on the water, indicating a lower density, which means it must have less mass.