Which of the following statement(s) is/are true? A. Rigidity: The mass per unit of a substance is known as its rigidity. B. Kinetic Energy: It is the type of energy present in a substance due to the particles that are in continuous motion in the substance. This is also the cause of motion in matter.
Only B is true
Only B is true is correct.
Statement A is incorrect. Mass per unit volume of a substance is its density, not rigidity. Rigidity refers to a material's resistance to deformation under an applied shear force and is quantified by the modulus of rigidity, not by mass per unit anything.
Statement B correctly describes kinetic energy. The particles of any substance are in continuous motion, and the energy associated with that motion is the kinetic energy of the particles; it also underlies thermal motion and the mobility of matter.
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