Engineering Materials MCQ Questions & Answers | Mechanical Engineering Page-8 section-2

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71.
Isotropic materials are those which have the same

A. Elastic properties in all directions

B. Stresses induced in all directions

C. Thermal properties in all directions

D. Electric and magnetic properties in all directions

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72.
The material in which the atoms are arranged chaotically, is called

A. Amorphous material

B. Mesomorphous material

C. Crystalline material

D. None of these

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73.
Tungsten when added to steel __________ the critical temperature.

A. Does not effect

B. Lowers

C. Raises

D. None of these

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74.
Which of the following represents the allotropic forms of iron?

A. Alpha iron, beta iron and gamma iron

B. Alpha iron and beta iron

C. Body centered cubic iron and face centered cubic iron

D. Alpha iron, gamma from and delta iron

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75.
The addition of which of the following improves machining of copper?

A. Sulphur

B. Vanadium

C. Tin

D. Zinc

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76.
Vanadium in high speed steels

A. Promotes decarburisation

B. Provides high hot hardness

C. Forms very hard carbides and thus increases wear resistance

D. Promotes retention of austenite

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77.
Basic solution is one which has pH value

A. Greater than 7

B. Equal to 7

C. Less than 7

D. pH value has nothing to do with basic solution

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78.
Neutral solution is one which has pH value

A. Greater than 7

B. Less than 7

C. Equal to 7

D. pH value has nothing to do with neutral solution

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79.
Acidic solution is one which has pH value

A. Greater than 7

B. Less than 7

C. Equal to 7

D. pH value has nothing to do with neutral solution

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80.
The toughness of a material __________ when it is heated.

A. Remain same

B. Decreases

C. Increases

D. None of these

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Engineering Materials MCQ Questions & Answers | Mechanical Engineering

71. Isotropic materials are those which have the same

Answer & Solution

72. The material in which the atoms are arranged chaotically, is called

Answer & Solution

73. Tungsten when added to steel __________ the critical temperature.

Answer & Solution

74. Which of the following represents the allotropic forms of iron?

Answer & Solution

75. The addition of which of the following improves machining of copper?

Answer & Solution

76. Vanadium in high speed steels

Answer & Solution

77. Basic solution is one which has pH value

Answer & Solution

78. Neutral solution is one which has pH value

Answer & Solution

79. Acidic solution is one which has pH value

Answer & Solution

80. The toughness of a material __________ when it is heated.

Answer & Solution

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71.
Isotropic materials are those which have the same

72.
The material in which the atoms are arranged chaotically, is called

73.
Tungsten when added to steel __________ the critical temperature.

74.
Which of the following represents the allotropic forms of iron?

75.
The addition of which of the following improves machining of copper?

76.
Vanadium in high speed steels

77.
Basic solution is one which has pH value

78.
Neutral solution is one which has pH value

79.
Acidic solution is one which has pH value

80.
The toughness of a material __________ when it is heated.