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# Materials Science MCQ’s – Design and Safety Factors

1 - Question

Which of the following is the numerator of factor safety formula?

a) Working stress

b) Shear stress

c) Tensile stress

d) Ultimate stress

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Answer: dExplanation: Factor of safety is defined as ratio of ultimate stress and working stress. It is also called as factor of ignorance. The factor of safety is dependent on the type of load.

2 - Question

Which of the following can be the factor of safety for a dead load?

a) 6

b) 2

c) 4

d) 7

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Answer: cExplanation: For dead load, the range in which the factor of safety can lie is 4 to 5. Therefore only 4 lies in that range and 6, 2, 7 are all values which are beyond that range.

3 - Question

Which of the following can be the factor of safety for shock loading?

a) 11

b) 13

c) 4

d) 7

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Answer: bExplanation: For shock loading, the range in which the factor of safety can lie is 12 to 15. Therefore only 13 lies in that range and 11, 4, 7 are all values which are beyond that range.

4 - Question

Factor of safety is used to find out the reliability of the design.

a) True

b) False

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Answer: aExplanation: Factor of safety tells us about how much load the material can take before it fails. Basically, it states the load carrying capacity of a material beyond the actual load.

5 - Question

What can understand by the factor of safety equal to one?

a) It means that the structure will fail under load

b) It means that the structure will only support the actual load

c) it means that the structure will support more than the actual load

d) There is no relation between factor safety and load application

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Answer: bExplanation: When the factor of safety is one it means that the ultimate stress is equal to the working stress and therefore the body can only support load up to actual load and no more before failing.

6 - Question

For which of the following design factor of safety the design will work properly?

a) 0.1

b) 1

c) 2

d) 0.9

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Answer: cExplanation: If the design factor of safety is not more than 1 then the design may not work and will fail under certain conditions.

7 - Question

What is a safe factor of failure for a component which on failure can result in financial loss or serious injury?

a) 1

b) 2

c) 3

d) 4

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Answer: dExplanation: For components which on failing can be hazardous and can lead to serious injuries, death and financial loss, the factor of safety should be taken equal to or more than 4.

8 - Question

Design factor for most aircraft structures is 2.

a) True

b) False

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Answer: bExplanation: The design factor of safety for most aircraft structures or components is taken to be 1.5 and not 2. More factors affect this value, but it is most of the time taken as 1.5.