Question

are all physical changes are reversible if not give example

Answer 1

No,all are not physical change. 
Ex-Tearing of paper, Burning of paper

Answer 2

All physical changes are reversible if not give example.

• No, certain physiological changes are irreversible. Take the tearing of a piece of paper. When a piece of paper is torn, its size and form change, but its molecular structure doesn't.
• Reversible physical modifications to matter exist: An ice cube can melt into liquid water, which can then be frozen again to form another ice cube. On the other hand, chemical alterations cannot be reversed: A burned log becomes ashes, but the ashes cannot be transformed back into a log.
• Many physical changes, such as the freezing of water into ice, can be undone. However, some physical modifications, like the cracking of an egg or the sawing of wood, cannot occur. Chemistry, Standard VI. Corrections suggested.
• Because physical alterations only affect a substance's physical characteristics—such as condition, shape, size, and color—and no new substances are created, they are typically reversible.
• Reversible changes include those caused by melting, boiling, evaporation, freezing, condensation, and disintegration.

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