Real time Operating Systems | MCQ

Question 1
What are the risks and challenges that we should be aware of when it comes to the Internet of Everything :
Select one:
Privacy.
Security
Network congestion
Electricity consumption at the peaks
All of these
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Your answer is incorrect.
The correct answer is: Electricity consumption at the peaks
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Question 2
What is the hyperperiod of 3 periodic tasks with periods 3,4 and 10
Select one:
60
17
120
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Your answer is correct.
The correct answer is: 60
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Question 3
The time T between any two consecutive sensor reading is called
Select one:
Sampling Period
Response Time
Turn around time
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Your answer is correct.
The correct answer is: Sampling Period
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Question 4
Calculate the idle time of the processor with 3 periodic tasks whose execution times are given as 1, 1, and 3, and their periods are 3, 4, and 10.
Select one:
17%
12%
88%
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The correct answer is: 12%
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Question 5
In rate monotonic scheduling algorithm
Select one:
shorter duration job has higher priority
longer duration job has higher priority
priority does not depend on the duration of the job
none of the mentioned
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Your answer is correct.
The correct answer is: shorter duration job has higher priority
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Question 6
Tasks whose execution would begin randomly and within the interval of arrival times of consecutive tasks is known as
Select one:
Periodic Task
Aperiodic Task
Sporadic Task
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The correct answer is: Sporadic Task
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Question 7
Which of these is true about an open loop system vs closed loop system:
Select one:
Open loop system provides better control in the presence of environmental disturbance
Closed loop systems are comparatively cheaper as they require less components & design effort
A kitchen toaster is a closed loop system
An open loop system can be made closed loop by introducing feedback and controlling
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Your answer is correct.
The correct answer is: An open loop system can be made closed loop by introducing feedback and controlling
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Question 8
State if the following statement is TRUE or FALSE
The objective of any good hard real‐time task scheduling algorithm is to minimize average task response times.
Select one:
True
False
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The correct answer is ‘False’.
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Question 9
What is True for a task vis-à-vis a process?
Select one:
Tasks are complex compared to processes
Tasks represent only a single sequence of instructions
Processes can spawn threads but tasks cannot spawn tasks
Tasks and processes are one and the same thing
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The correct answer is: Tasks represent only a single sequence of instructions
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Question 10
Hard real time operating system has ———jitter than a soft real time operating system
Select one:
less
more
equal
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Your answer is correct.
The correct answer is: less
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Question 11
The default language supported by Raspberry Pi board is _________.
Select one:
Java
Python
C
C#
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Your answer is correct.
The correct answer is: Python
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Question 12
In real time operating system
Select one:
all processes have the same priority
a task must be serviced by its deadline period
process scheduling can be done only once
kernel is not required
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Your answer is correct.
The correct answer is: a task must be serviced by its deadline period
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Question 13
RTOS is ________ in nature
Select one:
timely
non-accurate
memory oriented
high cpacity
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Your answer is correct.
The correct answer is: timely
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Question 14
What does the utilization rate tells us?
Select one:
If it is larger or equal to 1, the system is not feasible
If it is smaller than 1, the system is feasible
If it is exactly 1, the system is feasible if there is no context switch overhead
If it is 0, the system is absolutely feasible
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Your answer is correct.
The correct answer is: If it is larger or equal to 1, the system is not feasible
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Question 15
if jobs have unpredictable release times, a task is termed :
Select one:
aperiodic
sporadic
periodic.
None of these
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The correct answer is: aperiodic
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Question 16
Embedded system does not contain _________.
Select one:
Sensors
Actuators
Microcontrollers
None of these
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The correct answer is: None of these
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Question 17
What is TRUE for an aperiodic task and a sporadic task:
Select one:
A sporadic task and an aperiodic task are one and the same thing
An aperiodic task occurs randomly and has hard real time requirements
A sporadic task occurs randomly and has hard real time requirements
A sporadic task becomes aperiodic when it is executed with a periodic task
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Your answer is incorrect.
The correct answer is: A sporadic task occurs randomly and has hard real time requirements
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Question 18
For real time operating systems, interrupt latency should be
Select one:
minimal
maximum
zero
dependent on the scheduling
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The correct answer is: minimal
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Question 19
Identify the odd one out
Select one:
Vxworks
WinCE
Suse
Chimera
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Your answer is correct.
The correct answer is: Suse
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Question 20
State whether the following statements are True or False for the features of real time operating system.
i) fast process or thread switch
ii) ability to respond to external interrupts quickly.
iii) minimization of intervals during which interrupts are enabled.
iv) preemptive scheduling based on priority
Select one:
i, ii and iii only
ii, iii and iv only
i, ii and iv only
All i, ii, iii and iv
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Your answer is correct.
The correct answer is: i, ii and iv only
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