1. Range-free localization trying to find _____________ values distances or angles.
Correct : B. approximate
2. Following is the example of Range-Free Localization.
Correct : C. both a and b
3. Trilateration technique measures the _______to all anchors and Triangulation measures ________to all anchors,
Correct : C. distance, angle
4. Hop Based Localization uses the ___________ to calculate the approximate distance to the anchor.
Correct : B. mean hop length
5. Node A and B 130 meters away and 5 hope separated. Node B and C 170 meters away and 6 hope separated and Node A and c 120 meters away and 5 hope separated. Then the mean hop length is___ meters.
Correct : D. 26.1
6. Node A and B 130 meters away and 5 hope separated and Node A and c 120 meters away and 5 hope separated. Then the mean hop length is___ meters.
Correct : B. 25
7. While testing whether a node is inside a triangle or outside by moving node under consideration in any direction. If it gets closer or further away from all three triangle corners, then it is ________ the triangle.
Correct : A. outside
8. While testing whether a node is inside a triangle or outside by moving node under consideration in any direction. If it does not gets closer or further away from all the three triangle corners, then it is ________ the triangle.
Correct : A. outside
9. The node in the network, which produces the required data and is able to send it out to other nodes in the network is called as
Correct : A. data source
10. The node in the network, which requires the data and is able to receive it from other nodes in the network is called as
Correct : B. data destination
11. Any node in the network, which is able to receive it from another node and to send it further is called as
Correct : C. data forwarder
12. A dedicated node(s) in the network, which is the embedded destination of any data in this network is called as
Correct : D. data sink
13. Select the correct statement
Correct : C. a valid routing path consists of a finite number of nodes and it does not contain loops.
14. Select the incorrect statement.
Correct : A. while a normal data destination cannot change over time, the sink can.
15. Select the incorrect statement.
Correct : B. a sink cannot be mobile and change its position.
16. ___________ delivers the message to all nodes in the network. Single source and all destinations
Correct : A. full network broadcast
17. _____________ has one source and one destination, which could be any nodes in the network
Correct : B. unicast
18. ___________ has several destinations. There is a single source, but multiple destinations of the data.
Correct : C. multicast
19. _____________ is special sensor networks and refers to the collection of data from all nodes to a dedicated sink.
Correct : D. convergecast
20. Select incorrect statement
Correct : B. geographic proximity guarantee the availability or the shortness of a route to the destination.
21. Select incorrect statement
Correct : C. number of hops from the destination is always available at all nodes.
22. Select incorrect statement
Correct : D. two protocols can use the same metric, perform the routing differently but has same efficiency.
23. Which of the following measurement is based two signals with different velocities
Correct : D. time difference of arrival (tdoa)
24. Which of the following is not a prohibitive factors for GPS in wireless sensor networks
Correct : B. accuracy maximum up to 15 meters
25. In WSN messages travel multiple hops, so if it has a________ reliability on each link, then the probability of a message transiting the entire network would be _________.
Correct : B. high, low
26. From 20 localization measurements, 19 were inside a radius of 15 meters around the true position, while 1 was outside. This results in an accuracy of 15 meters with a precision of __________.
Correct : C. 95%.
27. A _____________ is a tuple, containing all anchors which can be seen at this place and their signal strengths (RSSI or LQI).
Correct : C. fingerprint
28. Location mules are another interesting approach to proximity schemes, where
Correct : B. a mobile node with an on-board gps
29. From 20 localization measurements, 18 were inside a radius of 15 meters around the true position, while 2 was outside. This results in an accuracy of 15 meters with a precision of __________.