Explanation: Generally ceramics have equal or better hardness, toughness and yield strength but are highly susceptible to plastic deformation. Even a small stress beyond their yield point leads to fracture.

Explanation: Since steels have very small amounts of carbon (usually less than 6%), they are considered iron alloy; hence metallic solid.

Explanation: Glass Fibre Reinforced Polymer (GFRP) or commonly called fiberglass is a lightweight, high-strength, and corrosion-resistant industrial material.

Explanation: Ceramics, which mainly consist of oxides, carbides and nitrides, can withstand very high temperatures; furnaces are generally lined with such ceramics.

Explanation: Bio-materials are implanted into living bodies for replacement of damaged parts and hence, must be compatible with the body tissues and be non-toxic. As long as these criteria are met, all of the above materials – metals, ceramics, polymers and their combinations can be used as bio-materials.

Explanation: Polymeric molecules are aggregates of a large number of monomer units and possess high molecular mass. Hooke’s law generally does not apply to polymers as the stress developed is not directly proportional to deformation. Due to low densities, strength to mass ratio of polymers is often comparable to metals and ceramics.

Explanation: Isotopes of a given element have the same number of protons but not of neutrons which causes variation in molar mass. This also results in different p-n ratio, thus making one isotope more stable than other. For example, protium is stable but tritium is radioactive.

Explanation: Isobars differ in a number of protons as well as that of neutrons but total number of nucleons( protons and neutrons) is the same for all the isobars. Hence, isobars have the same atomic weight.