UGC NET COMPUTER SCIENCE SOLVED PAPERS 2017-19 - UGC NET Computer Science November 2017 Paper 2

46. Which of the following is not a Clustering method?

  • Option : C
  • Explanation :
    k-means clustering is a method of vector quantization, originally from signal processing, that is popular for cluster analysis in data mining.
    Self-Organizing Map Self Organizing Map (SOM) provides a data visualization technique. SOM also represents clustering concept by grouping similar data together.
    k-nearest neighbors algorithm (k-NN) is a non-parametric method used for classification and regression.
    Agglomerative hierarchical clustering is a bottom-up clustering method where clusters have sub-clusters, which in turn have sub-clusters, etc.
    Option (C) is correct.
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47. Which of the given wireless technologies used in IoT, consumes the least amount of power?

  • Option : B
  • Explanation :
    Internet of things(IoT) uses short range communication technology - Bluetooth. It’s an ultra low energy wireless technology for IOT devices which consumes the smallest amount of power in comparison to the already existing Bluetooth networking standards. So, option (B) is correct.
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48. Which speed up could be achieved according to Amdahl’s Law for infinite number of processes if 5% of a program is sequential and the remaining part is ideally parallel?

  • Option : C
  • Explanation :
    According to Amdahl's law speed up for infinite number of process:
    S = 1 / (1-P)
    where p is parallel part of program Given, sequential part of program is 5%. So parallel part of the program (P)
    = 1 - sequential part
    = 1 - 0.05 (or 5%)
    = 0.95 (or 95%)
    Now S = 1 / (1-P)
    ie S = 1 / (1-0.95)
     S = 1 / 0.05
     S = 20
    So, option (C) is correct.
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49. Negation of the proposition ∃ x H(x) is:
(1) ∃x ¬ H(x)
(2) ∀x ¬ H(x)
(3) ∀x H(x)
(4) ¬ x H(x)

  • Option : B
  • Explanation :
    ince logic says that there exist some x for which H(x) is true, So the negation for this will be for all x H(x) is not true. We can write it:
    ¬∃xH(x) =∀x¬H(x)
    So, option (B) is correct.
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50. The output of the following combinational circuit is F.

Nov2017 cs
The value of F is:

  • Option : B
  • Explanation :
    We know that (A+B)(A+C) = A + BC ON the basis of Given question OR gates will produce output: (P1+P'2+P'3) (P1+P'2+P3) (P1+P2+P3) AND gate will take all three input produced by OR gate and generate (P1 + P'2P'3) as output.
    Nov2017 cs
    So, option (B) is correct.
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