Real Time Systems - Part 2

Multiple choice questions and answers
Hope the answers(bold) are correct. If any of the answer is wrong, please comment. I will check and update.

26. A job is preemptable if it must be executed from start to completion without interruption

a. True

b. False

27. Effective deadline ___________

a. Of a job without a successor is equal to its given deadline

b. Of a job without a predecessor is equal to its given deadline

c. Of a job without a successor is equal to its given release time

d. None of the above

28. If execution time of three periodic tasks is 1, 1 and 3 and their periods are 3, 4 and 10 respectively, then their utilizations are

a. .33, .25 and .3

b. .36, .25 and .4

c. .25, .33 and .3

d. None of the above

29. A validation algorithm is ____________ when it is overly pessimistic and declares tasks unable to meet their timing constraints except when system resources are unduly underutilized.

a. Accurate

b. Inaccurate

c. Accepted

d. None of the above

30. Which is not the real time system?

a. A system that must satisfy explicit response time constraint or risk severe consequences, including failure

b. A system that can not satisfy one or more of the requirements stipulated in the formal system specification

c. A system is one whole logical correctness is based on both the correctness of the outputs and their timeline

d. None of the above

31. Which feature of OOPs help the reuse of code

a. Inheritance

b. Class

c. Object

d. None of the above

32. SRD is

a. Software requirements definition

b. Structured requirements definition

c. Software requirements diagram

d. Structured requirements diagram

33. Memory reference instruction is an instruction that communicate with virtual memory, writing to it or reading from it

a. True

b. False

34. Who does unit testing?

a. Testers

b. Customer

c. End users

d. Developers

35. Capability maturity model is a software life cycle model

a. True

b. False

36. Flow chart algorithm can be used for

a. Unit testing

b. Black box testing

c. White box testing

d. None of the above

37. __________ include interrupts that occur at both fixed rates and sporadically

a. Hybrid system

b. Preemptive system

c. Open system

d. None of above

38. In which model, the second phase will be started only when defined set of goals is achieved in first phase

a. The waterfall model

b. Prototyping model

c. The evolutionary model

d. The spiral model

39. Encapsulation in OPP, encapsulate the

a. Data only

b. Behavior only

c. a and b

d. None of the above

40. Register that holds the address of the memory location

a. MAR

b. MDR

c. LRU

d. None of the above

41. Which model is oldest in software development

a. The waterfall model

b. Prototyping model

c. The evolutionary model

d. The spiral model

42. _______ is the process of saving and restoring sufficient information for a real time task so that it can be resumed after interrupt.

a. Hardware interrupt

b. Software interrupt

c. Context switching

d. None of the above

43. SRS is

a. Software requirement specification

b. Software requirement solution

c. System requirement specification

d. None of the above

44. Run time stack cannot be used in a round robin system because of the first in, first out nature of the scheduling.

a. True

b. False

45. Risk management is the most important feature of

a. The waterfall model

b. Prototyping model

c. Agile model

d. The spiral model

46. The memory which does not rely on a capacitive charge to store binary data

a. Static

b. Dynamic

c. a and b

d. None of the above

47. Which model is mostly used in these days for software development

a. The waterfall model

b. Prototyping model

c. Agile model

d. The spiral model

48. Which SDLC model starts testing activities with development activities

a. The waterfall model

b. Spiral model

c. V model

d. Linear model

49. Unit testing is a

a. Stress testing

b. Black box testing

c. Regression testing

d. None of the above

50. Critical section is most important layer of OS

a. True

b. False