77) Cold working of a metal dramatically a) increases the number of dislocations

Question

77) Cold working of a metal dramatically

a) increases the number of dislocations and makes the material softer

b) decreases the number of dislocations and makes the material softer

c) increases the number of dislocations and makes the material harder

d) decreases the number of dislocations and makes the material harder

.

78) What is concrete made of?

a) calcium sulfate (gypsum), water, and fiberglass.

b) cement, fine and coarse aggregate, water and air

c) calcium oxide, silica, iron oxide, and aluminum oxide.

d) Iron and carbon

.

79) What is cement made of?

a) calcium sulfate (gypsum), water, and fiberglass.

b) gypsum, fine and coarse aggregate, water and air

c) calcium oxide, silica, iron oxide, and aluminum oxide.

d) Iron and carbon

.

80) The matrix in a polymer composite is

a) a virtual reality maintained by artificial intelligence.

b) reinforcing, high modulus , high strength fibers

c) a polymer adhesive binding the filler

d) the shape of the composite.

Please answer all of them without guessing!!! Thanks

Explanation / Answer

77)

Strengthening of Cold working is occurs because of dislocation movements and dislocation generation within the crystal structure of the material. Due to disloaction material softer in nature. Therefore, the correct option is (b).

78)

Cement is gypsum, fine and coarse aggregate, water and air. Therefore, the correct option is (b).

79)

The matrix in a polymer composite is reinforcing, high modulus , high strength fibers. Theefore, the correct option is (b).

Concrete is made of cement, fine and coarse aggregate, water and air. Therefore, the correct option is "b".

79)

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