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491. Piezoelectric is a material

A. Whose properties is midway between the constituent materials
B. Which gets polarised, when stressed
C. In which magnetising force reduces when current flowing through it is in-cresed
D. Which changes dimensions due to applied field
✅ The correct answer is option B.

457. Nusselt number/Biot number varies

A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid
✅ The correct answer is option A.
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