Software Reliability and Fault Tolerance MCQs

1. What is MTTF ?

A. Maximum time to failure

B. Mean time to failure

C. Minimum time to failure

D. None of the mentioned

✅ The correct answer is option B.

2. A system maintaining its integrity while accepting a temporary halt in its operation is said to be in a state of___________________?

A. Full Fault Tolerance

B. Graceful Degradation

C. Fail Soft

D. Fail Safe

✅ The correct answer is option D.

3. What type of fault remains in the system for some period and then disappears ?

A. Permanent

B. Transient

C. Intermittent

D. All of the mentioned

✅ The correct answer is option B.
Explanation: For example many faults in communication systems are transient in nature.

4. Exception handling is a type of_________________?

A. forward error recovery mechanism

B. backward error recovery mechanism

C. All of the mentioned

D. None of the mentioned

✅ The correct answer is option A.
Explanation: Exception handling is a forward error recovery mechanism, as there is no roll back to a previous state; instead control is passed to the handler so that recovery procedures can be initiated.

5. Time Behavior and Resource Behavior fall under which quality attribute of ISO 9126 ?

A. Reliability

B. Efficiency

C. Functionality

D. Usability

✅ The correct answer is option B.
Explanation: The Characteristics mentioned in the question are related to the relationship between the level of performance of the software and the amount of resources used, under stated conditions.

6. NHPP stands for__________________?

A. Non Homogeneous Poisson Product

B. Non-Hetrogeneous Poisson Product

C. Non-Hetrogeneous Poisson Process

D. Non Homogeneous Poisson Process

✅ The correct answer is option D.

7. It is imperative for a communicating processes to reach consistent recovery points to avoid the __________________ effect, with backward error recovery mechanism ?

A. Static

B. Dynamic

C. Domino

D. Whirlpool

✅ The correct answer is option C.

8. IMC Networks is a leading __________________ certified manufacturer of optical networking and LAN/WAN connectivity solutions for enterprise, telecommunications and service provider applications ?

A. Telco Systems

B. D-Link

C. Arista Networks

D. ISO 9001

✅ The correct answer is option A.
Explanation: Founded in 1988, with over one million products installed worldwide, IMC Networks offers a wide range of fiber media and mode converters for a variety of applications.

9. How many levels are present in CMM ?

A. three

B. four

C. five

D. six

✅ The correct answer is option C.
Explanation: The five levels are: initial, repeatable, defined, managed, optimizing

10. All fault-tolerant techniques rely on__________________?

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.