Spark Training- Post Test

71 Questions | By Ravisoftsource | Updated: Oct 20, 2022 | Attempts: 1706

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Questions and Answers

1.

DataFrame schemas are determined
- A.
  
  Lazily
- B.
  
  Eagerly
2.

Which of the following is the entry point of Spark SQL in Spark 2.0?
- A.
  
  SparkContext (sc)
- B.
  
  SparkSession (spark)
- C.
  
  Both a and b
- D.
  
  None of the above
3.

Which of the following is not a function of Spark Context ?
- A.
  
  To get the current status of Spark Application
- B.
  
  To set the configuration
- C.
  
  To Access various services
- D.
  
  Entry point to Spark SQL
4.

What does the following code print? val lyrics = List("all", "that", "i", "know") println(lyrics.size)
- A.
  
  4
- B.
  
  3
5.

Spark is 100x faster than MapReduce due to
- A.
  
  In-memory computing
- B.
  
  Development in Scala
6.

Which type of processing Apache Spark can handle
- A.
  
  Batch Processing
- B.
  
  Stream Processing
- C.
  
  Graph Processing
- D.
  
  Interactive Processing
- E.
  
  All of the above
7.

Choose correct statement about RDD
- A.
  
  RDD is a database
- B.
  
  RDD is a distributed data structure
- C.
  
  RDD is a programming paradigm
- D.
  
  None
8.

Identify Correct Action
- A.
  
  Reduce
- B.
  
  Map
- C.
  
  Filter
- D.
  
  None
9.

How do you print schema of a dataframe?
- A.
  
  Df.printSchema()
- B.
  
  Df.show()
- C.
  
  Df.take
- D.
  
  Printschema
10.

Which of the following is true about DataFrame?
- A.
  
  DataFrame API have provision for compile time type safety.
- B.
  
  DataFrames provide a more user friendly API than RDDs.
- C.
  
  Both a and b
- D.
  
  None of the above
11.

What does the following code print? var number = {val x = 2 * 2; x + 40} println(number)
- A.
  
  Error
- B.
  
  44
- C.
  
  40
12.

Data transformations are executed
- A.
  
  Eagerly
- B.
  
  Lazily
13.

How many Spark Context can be active per job?
- A.
  
  More than one
- B.
  
  Only one
- C.
  
  Not specific
- D.
  
  None of the above
14.

DataFrames and _____________ are abstractions for representing structured data
- A.
  
  RDD
- B.
  
  Datasets
15.

Apache Spark has API's in
- A.
  
  Java
- B.
  
  Scala
- C.
  
  Python
- D.
  
  All of the above
16.

Which of the following is not the feature of Spark?
- A.
  
  Supports in-memory computation
- B.
  
  Fault-tolerance
- C.
  
  It is cost efficient
- D.
  
  Compatible with other file storage system
17.

Which of the following is true about Scala type inference ?
- A.
  
  The data type of the variable has to be mentioned explicitly
- B.
  
  The type of the variable is determined by looking at its value.
18.

What will be the output: val rawData = spark.read.textFile("PATH").rdd val result = rawData.filter...
- A.
  
  Process the data as per the specified logic
- B.
  
  Compilation error
- C.
  
  Won't be executed
- D.
  
  None
19.

Datasets are only defined in Scala and ______
- A.
  
  Python
- B.
  
  Java
20.

What does the following code print? val simple = Map("r" -> "red", "g" -> "green") println(simple("g"))
- A.
  
  Red
- B.
  
  Green
- C.
  
  Error
21.

What does the following code print? val dd: Double = 9.99 dd = 10.01 println(dd)
- A.
  
  10.01
- B.
  
  9.99
- C.
  
  Error
22.

What does the following code print? var aa: String = "hello" aa = "pretty" println(aa)
- A.
  
  Hello
- B.
  
  Pretty
- C.
  
  Error
23.

Identify correct transformation
- A.
  
  Map
- B.
  
  Filter
- C.
  
  Join
- D.
  
  All of the above
24.

Choose correct statement
- A.
  
  All the transformations and actions are lazily evaluated
- B.
  
  Execution starts with the call of Action
- C.
  
  Execution starts with the call of Transformation
25.

What does Spark Engine do?
- A.
  
  Scheduling
- B.
  
  Distributing data across cluster
- C.
  
  Monitoring data across cluster
- D.
  
  All of the above