Software Reliability and Fault Tolerance MCQs

Which of the following is not a phase of “bathtub curve” of hardware reliability ?

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A. Useful Life
B. Burn-in
C. Wear-out
D. Time
✅ The correct answer is option D.
Explanation: Time is the horizontal dimension on which the bathtub curve is built and not the phase.

How many product quality factors are proposed in McCall quality model ?

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A. 2
B. 3
C. 11
D. 8
✅ The correct answer is option B.
Explanation: McCall quality model has three product quality factors namely: Product revision, Product operation, Product Transition .

Failure In Time (FIT) is another way of reporting __________________?

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A. MTTR
B. MTTF
C. MTSF
D. MTBF
✅ The correct answer is option D.
Explanation: FIT reports the number of expected failures per one billion hours of operation for a device. This term is used particularly by the semiconductor industry but is also used by component manufacturers.

How is software reliability defined ?

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A. time
B. efficiency
C. quality
D. speed
✅ The correct answer is option nu.
Explanation: Software Reliability mainly concerned with the time component. It can be seen in various models like Basic Execution Time Model and Logarithmic Poisson Execution Time Model.

Which level of CMM is for process management ?

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A. Initial
B. Repeatable
C. Defined
D. Optimizing
✅ The correct answer is option D.
Explanation: It is a characteristic of processes at this level that the focus is on continually improving process performance through both incremental and innovative technological changes/improvements.

All fault-tolerant techniques rely on__________________?

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A. Integrity
B. Dependability
C. Redundancy
D. None of the mentioned
✅ The correct answer is option C.
Explanation: All fault-tolerant techniques rely on extra elements introduced into the system to detect & recover from faults.