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301. |
Point out the correct statement. |
A. | mahout is distributed under a commercially friendly apache software license |
B. | mahout is a library of scalable machine- learning algorithms, implemented on top of apache hadoop® and using the mapreduce paradigm |
C. | apache mahout is a project of the apache software foundation to produce free implementations of distributed or otherwise scalable machine learning algorithms |
D. | none of the mentioned |
Answer» D. none of the mentioned | |
Explanation: the goal of mahout is to build a vibrant, responsive, diverse community to facilitate discussions not only on the project itself but also on potential use cases. |
302. |
does not restrict contributions to Hadoop based implementations. |
A. | mahout |
B. | oozie |
C. | impala |
D. | all of the mentioned |
Answer» A. mahout | |
Explanation: mahout is distributed under a commercially friendly apache software license. |
303. |
identification algorithm which scores collocations using log-likelihood ratio. |
A. | collocation |
B. | compaction |
C. | collection |
D. | none of the mentioned |
Answer» A. collocation | |
Explanation: the log-likelihood score indicates the relative usefulness of a collocation with regards other term combinations in the text. |
304. |
Point out the wrong statement. |
A. | ‘taste’ collaborative-filtering recommender component of mahout was originally a separate project and can run standalone without hadoop |
B. | integration of mahout with initiatives such as the pregel-like giraph are actively under discussion |
C. | calculating the llr is very straightforward |
D. | none of the mentioned |
Answer» D. none of the mentioned | |
Explanation: there are a couple ways to run the llr-based collocation algorithm in mahout. |
305. |
to produce NGrams of the desired length. |
A. | shnglefil |
B. | shinglefilter |
C. | singlefilter |
D. | collfilter |
Answer» B. shinglefilter | |
Explanation: the tools that the collocation identification algorithm are embedded within either consume tokenized text as input or provide the ability to specify an implementation of the lucene analyzer class perform tokenization in order to form ngrams. |
306. |
A key of type is generated which is used later to join ngrams with their heads and tails in the reducer phase. |
A. | gramkey |
B. | primary |
C. | secondary |
D. | none of the mentioned |
Answer» A. gramkey | |
Explanation: the gramkey is a composite key made up of a string n-gram fragment as the primary key and a secondary key used for grouping and sorting in the reduce phase. |
307. |
unique ngrams or ngram fragments across multiple documents. |
A. | colloccombiner |
B. | collocreducer |
C. | collocmerger |
D. | none of the mentioned |
Answer» A. colloccombiner | |
Explanation: the combiner treats the entire gramkey as the key and as such, identical |
308. |
integrated into the process that is used to create vectors from sequence files of text keys and values. |
A. | lbr |
B. | lcr |
C. | llr |
D. | lar |
Answer» C. llr | |
Explanation: the –minllr option can be used to control the cutoff that prevents collocations below the specified llr score from being emitted. |
309. |
The LU method of factorization was introduced by the mathematician |
A. | alan tango |
B. | david hilbert |
C. | g. w. leibniz |
D. | alex grothendieck |
Answer» A. alan tango | |
Explanation: the lu method of factorization was introduced by the mathematician alan tango. he was an english mathematician. |
310. |
Which of the following step is not involved in the factorization process? |
A. | converting the given system to matrix form |
B. | the matrix is decomposed into the product of lower and upper triangular matrix |
C. | finding the unknowns using matrix multiplication |
D. | elimination of unknowns using back substitution |
Answer» D. elimination of unknowns using back substitution | |
Explanation: the first step is to convert the given system to matrix form. and then after using this method the matrix is decomposed into the product of lower and upper triangular matrix. lastly, the unknowns are found using matrix multiplication. |
311. |
Errors may occur in performing numerical computation on the computer due to which of the following reasons? |
A. | rounding errors |
B. | power fluctuation |
C. | operator fatigue |
D. | back substitution |
Answer» A. rounding errors | |
Explanation: rounding errors generally produces errors while performing numerical computation on the computer. power fluctuation and operator fatigue are not the general problems which occur in performing numerical computations. |
312. |
What is the other name for factorization method? |
A. | doolittle’s method |
B. | lin bairstow method |
C. | muller’s method |
D. | decomposition method |
Answer» A. doolittle’s method | |
Explanation: another name for factorization method is doolittle’s method as doolittle’s method is basically an algorithm of factorization method. |
313. |
What is the principle of factorization? |
A. | there exists no inverse for a singular matrix |
B. | determinant of an identity matrix is one |
C. | every square matrix can be expressed as a product of a lower triangular matrix and upper triangular matrix |
D. | every matrix can be expressed as a sum of a skew symmetric and a symmetric matrix |
Answer» C. every square matrix can be expressed as a product of a lower triangular matrix and upper triangular matrix | |
Explanation: the principle of factorization is that every square matrix can be expressed as a product of a lower triangular matrix and upper triangular matrix. on the basis of this fact, these lower and upper triangular matrices help us in finding the unknowns. |
314. |
What is the condition applied in factorization method? |
A. | matrix should not be singular |
B. | back substitution should be done |
C. | there must exist a diagonal matrix form of the given matrix |
D. | all principal minors of the matrix should be non-singular |
Answer» D. all principal minors of the matrix should be non-singular | |
Explanation: the necessary condition for factorization method is that all principal minors of the matrix should be non-singular. otherwise, there will be no formation of lower and upper triangular matrix. |
315. |
While solving a system of linear equations, which of the following will be the order of the decomposed matrices; L and U? |
A. | order of l = 3x1, order of u = 1x3 |
B. | order of l = 3x2, order of u = 2x3 |
C. | order of l = 3x3, order of u = 3x3 |
D. | order of l = 3x4, order of u = 4x3 |
Answer» C. order of l = 3x3, order of u = 3x3 | |
Explanation: the order of the decomposed matrices of a given matrix of the coefficient of |
316. |
TCP/IP model does not have layer but OSI model have this layer. |
A. | session layer |
B. | transport layer |
C. | application layer |
D. | network layer |
Answer» A. session layer | |
Explanation: in osi reference model, there are two layers which are not present in tcp/ip model. they are presentation and session layer. the functions of presentation and session layer in the osi model are handled by the transport layer itself in tcp/ip. |
317. |
Which layer is used to link the network support layers and user support layers? |
A. | session layer |
B. | data link layer |
C. | transport layer |
D. | network layer |
Answer» C. transport layer | |
Explanation: physical, data link and network layers are network support layers and session, presentation and application layers are user support layers. the transport layer links these layers by segmenting and rearranging the data. it uses protocols like tcp and udp. |
318. |
Which address is used on the internet for employing the TCP/IP protocols? |
A. | physical address and logical address |
B. | port address |
C. | specific address |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
Explanation: the physical, logical, port and specific addresses are used in tcp/ip protocol. all the addressing schemes, that is physical (mac) and logical address, port address and specific address are employed in both tcp/ip model and osi model. in tcp/ip, the addresses are more focused on the internet implementation of these addresses. |
319. |
TCP/IP model was developed the OSI model. |
A. | prior to |
B. | after |
C. | simultaneous to |
D. | with no link to |
Answer» A. prior to | |
Explanation: several tcp/ip prototypes were developed at multiple research centers between 1978 and 1983, whereas osi reference model was developed in the year 1984. tcp/ip was developed with the intention to create a model for the internet while osi was intended to be a general network model. |
320. |
Which layer is responsible for process to process delivery in a general network model? |
A. | network layer |
B. | transport layer |
C. | session layer |
D. | data link layer |
Answer» B. transport layer | |
Explanation: the role of transport layer (layer 4) is to establish a logical end to end connection between two systems in a network. the protocols used in transport layer is tcp and udp. the transport layer is responsible for segmentation of the data. it uses ports for the implementation of process-to-process delivery. |
321. |
Which address is used to identify a process on a host by the transport layer? |
A. | physical address |
B. | logical address |
C. | port address |
D. | specific address |
Answer» C. port address | |
Explanation: a port number is a way to identify a specific process to which an internet or other network message is to be forwarded when it arrives at a server. some examples of port numbers are port 20 which is used for ftp data, port 22 which is used for ssh remote login ,and port 23 which is used for telnet. |
322. |
Which layer provides the services to user? |
A. | application layer |
B. | session layer |
C. | presentation layer |
D. | physical layer |
Answer» A. application layer | |
Explanation: in networking, a user mainly |
323. |
Transmission data rate is decided by |
A. | network layer |
B. | physical layer |
C. | data link layer |
D. | transport layer |
Answer» B. physical layer | |
Explanation: physical layer is a layer 1 device which deals with network cables or the standards in use like connectors, pins, electric current used etc. basically the transmission speed is determined by the cables and connectors used. hence it is physical layer that determines the transmission speed in network. some of the cables used for high speed data transmission are optical fiber cables and twisted pair cables. |
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