Question 7

Plastics are extremely malleable.

Plastics are extremely malleable; they can be molded into objects in several different ways (for example, by casting or extrusion) and formed into a variety of shapes. This property allows for versatility in manufacturing and design.

A) malleable

This option is correct because "malleable" refers to the ability of a material to be easily shaped or formed, particularly when subjected to pressure. In the context of plastics, this property is essential as it enables them to be molded into various forms and shapes.

B) obscure

"Obscure" is incorrect as it means not clear or hard to perceive. This term does not relate to the characteristics of plastics in terms of their physical manipulation or shaping capabilities, which is the focus of the sentence.

C) ominous

"Ominous" is also incorrect, as it refers to something that suggests a future event, typically a negative one. This word does not apply to the physical properties of plastics and does not contribute to the intended meaning of the sentence.

D) vigorous

"Vigorous" is incorrect, as it means strong, healthy, or full of energy. While it describes a quality that could be associated with some materials, it does not accurately describe the ability of plastics to be molded or shaped, which is the key point of the sentence.

Conclusion

Malleability is the defining characteristic of plastics that allows them to be easily shaped and formed, making option A the only suitable choice. The other options fail to capture the essence of the statement, which focuses on the physical properties of plastics in manufacturing and design. Thus, "malleable" is the word that best completes the sentence.