Practice Spark RDD Basics MCQ questions with detailed explanations and clear answer validation. These MCQs help you revise core concepts, compare close options, and improve accuracy for interviews, certification exams, and technical screening rounds. Use this updated 2026 set to strengthen fundamentals and confidence.
Q51. Which statement about aggregateByKey is most accurate?
Select an answer to check.
Answer: Aggregate with seed and combine logic.
Here, Aggregate with seed and combine logic. is the right choice. Flexible aggregation. It aligns directly with what the question asks about which statement about aggregatebykey is most accurate. Competing choices sound plausible, but they miss the key condition.
Q52. How is aggregateByKey best characterized?
Select an answer to check.
Answer: Aggregate with seed and combine logic.
In this case, Aggregate with seed and combine logic. is correct. Flexible aggregation. It aligns directly with what the question asks about how is aggregatebykey best characterized. Competing choices sound plausible, but they miss the key condition.
Q53. Which option best describes combineByKey?
Select an answer to check.
Answer: General by-key combiner.
The best option here is General by-key combiner.. Underlies aggregateByKey/reduceByKey. It aligns directly with what the question asks about which option best describes combinebykey. Competing choices sound plausible, but they miss the key condition.
Q54. What is the primary purpose of combineByKey?
Select an answer to check.
Answer: General by-key combiner.
For this question, General by-key combiner. is correct. Underlies aggregateByKey/reduceByKey. It aligns directly with what the question asks about what is the primary purpose of combinebykey. Competing choices sound plausible, but they miss the key condition.
Q55. Which statement about combineByKey is most accurate?
Select an answer to check.
Answer: General by-key combiner.
General by-key combiner. is the correct answer here. Underlies aggregateByKey/reduceByKey. It aligns directly with what the question asks about which statement about combinebykey is most accurate. Competing choices sound plausible, but they miss the key condition.
Q56. How is combineByKey best characterized?
Select an answer to check.
Answer: General by-key combiner.
Here, General by-key combiner. is the right choice. Underlies aggregateByKey/reduceByKey. This matches the core idea being tested around how is combinebykey best characterized. Competing choices sound plausible, but they miss the key condition.
Q57. Which option best describes join (RDD)?
Select an answer to check.
Answer: Join two PairRDDs by key (shuffle).
In this case, Join two PairRDDs by key (shuffle). is correct. Wide transformation. This matches the core idea being tested around which option best describes join (rdd). Competing choices sound plausible, but they miss the key condition.
Q58. What is the primary purpose of join (RDD)?
Select an answer to check.
Answer: Join two PairRDDs by key (shuffle).
The best option here is Join two PairRDDs by key (shuffle).. Wide transformation. This matches the core idea being tested around what is the primary purpose of join (rdd). Competing choices sound plausible, but they miss the key condition.
Q59. Which statement about join (RDD) is most accurate?
Select an answer to check.
Answer: Join two PairRDDs by key (shuffle).
For this question, Join two PairRDDs by key (shuffle). is correct. Wide transformation. This matches the core idea being tested around which statement about join (rdd) is most accurate. Competing choices sound plausible, but they miss the key condition.
Q60. How is join (RDD) best characterized?
Select an answer to check.
Answer: Join two PairRDDs by key (shuffle).
Join two PairRDDs by key (shuffle). is the correct answer here. Wide transformation. This matches the core idea being tested around how is join (rdd) best characterized. Competing choices sound plausible, but they miss the key condition.
Q61. Which option best describes union?
Select an answer to check.
Answer: Concatenate two RDDs.
Here, Concatenate two RDDs. is the right choice. Narrow transformation. That is exactly the concept behind which option best describes union in this context. Competing choices sound plausible, but they miss the key condition.
Q62. What is the primary purpose of union?
Select an answer to check.
Answer: Concatenate two RDDs.
In this case, Concatenate two RDDs. is correct. Narrow transformation. That is exactly the concept behind what is the primary purpose of union in this context. Competing choices sound plausible, but they miss the key condition.
Q63. Which statement about union is most accurate?
Select an answer to check.
Answer: Concatenate two RDDs.
The best option here is Concatenate two RDDs.. Narrow transformation. That is exactly the concept behind which statement about union is most accurate in this context. Competing choices sound plausible, but they miss the key condition.
Q64. How is union best characterized?
Select an answer to check.
Answer: Concatenate two RDDs.
For this question, Concatenate two RDDs. is correct. Narrow transformation. That is exactly the concept behind how is union best characterized in this context. Competing choices sound plausible, but they miss the key condition.
Q65. Which option best describes collect?
Select an answer to check.
Answer: Bring all elements to the driver.
Bring all elements to the driver. is the correct answer here. Action; OOM risk on large data. That is exactly the concept behind which option best describes collect in this context. Competing choices sound plausible, but they miss the key condition.
Q66. What is the primary purpose of collect?
Select an answer to check.
Answer: Bring all elements to the driver.
Here, Bring all elements to the driver. is the right choice. Action; OOM risk on large data. It fits the requirement in the prompt about what is the primary purpose of collect. Competing choices sound plausible, but they miss the key condition.
Q67. Which statement about collect is most accurate?
Select an answer to check.
Answer: Bring all elements to the driver.
In this case, Bring all elements to the driver. is correct. Action; OOM risk on large data. It fits the requirement in the prompt about which statement about collect is most accurate. Competing choices sound plausible, but they miss the key condition.
Q68. How is collect best characterized?
Select an answer to check.
Answer: Bring all elements to the driver.
The best option here is Bring all elements to the driver.. Action; OOM risk on large data. It fits the requirement in the prompt about how is collect best characterized. Competing choices sound plausible, but they miss the key condition.
Q69. Which option best describes count?
Select an answer to check.
Answer: Return number of elements.
For this question, Return number of elements. is correct. Action. It fits the requirement in the prompt about which option best describes count. Competing choices sound plausible, but they miss the key condition.
Q70. What is the primary purpose of count?
Select an answer to check.
Answer: Return number of elements.
Return number of elements. is the correct answer here. Action. It fits the requirement in the prompt about what is the primary purpose of count. Competing choices sound plausible, but they miss the key condition.
Q71. Which statement about count is most accurate?
Select an answer to check.
Answer: Return number of elements.
Here, Return number of elements. is the right choice. Action. This is the most accurate statement for which statement about count is most accurate. Competing choices sound plausible, but they miss the key condition.
Q72. How is count best characterized?
Select an answer to check.
Answer: Return number of elements.
In this case, Return number of elements. is correct. Action. This is the most accurate statement for how is count best characterized. Competing choices sound plausible, but they miss the key condition.
Q73. Which option best describes take(n)?
Select an answer to check.
Answer: Return first n elements.
The best option here is Return first n elements.. Action. This is the most accurate statement for which option best describes take(n). Competing choices sound plausible, but they miss the key condition.
Q74. What is the primary purpose of take(n)?
Select an answer to check.
Answer: Return first n elements.
For this question, Return first n elements. is correct. Action. This is the most accurate statement for what is the primary purpose of take(n). Competing choices sound plausible, but they miss the key condition.
Q75. Which statement about take(n) is most accurate?
Select an answer to check.
Answer: Return first n elements.
Return first n elements. is the correct answer here. Action. This is the most accurate statement for which statement about take(n) is most accurate. Competing choices sound plausible, but they miss the key condition.
Q76. How is take(n) best characterized?
Select an answer to check.
Answer: Return first n elements.
Here, Return first n elements. is the right choice. Action. It aligns directly with what the question asks about how is take(n) best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q77. Which option best describes saveAsTextFile?
Select an answer to check.
Answer: Write RDD to filesystem as text.
In this case, Write RDD to filesystem as text. is correct. Action. It aligns directly with what the question asks about which option best describes saveastextfile. The remaining choices fail because they don’t satisfy the full definition.
Q78. What is the primary purpose of saveAsTextFile?
Select an answer to check.
Answer: Write RDD to filesystem as text.
The best option here is Write RDD to filesystem as text.. Action. It aligns directly with what the question asks about what is the primary purpose of saveastextfile. The remaining choices fail because they don’t satisfy the full definition.
Q79. Which statement about saveAsTextFile is most accurate?
Select an answer to check.
Answer: Write RDD to filesystem as text.
For this question, Write RDD to filesystem as text. is correct. Action. It aligns directly with what the question asks about which statement about saveastextfile is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q80. How is saveAsTextFile best characterized?
Select an answer to check.
Answer: Write RDD to filesystem as text.
Write RDD to filesystem as text. is the correct answer here. Action. It aligns directly with what the question asks about how is saveastextfile best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q81. Which option best describes partitioning (RDD)?
Here, Partitioner controls key-to-partition mapping. is the right choice. HashPartitioner/RangePartitioner. This matches the core idea being tested around which option best describes partitioning (rdd). The remaining choices fail because they don’t satisfy the full definition.
Q82. What is the primary purpose of partitioning (RDD)?
In this case, Partitioner controls key-to-partition mapping. is correct. HashPartitioner/RangePartitioner. This matches the core idea being tested around what is the primary purpose of partitioning (rdd). The remaining choices fail because they don’t satisfy the full definition.
Q83. Which statement about partitioning (RDD) is most accurate?
The best option here is Partitioner controls key-to-partition mapping.. HashPartitioner/RangePartitioner. This matches the core idea being tested around which statement about partitioning (rdd) is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q84. How is partitioning (RDD) best characterized?
For this question, Partitioner controls key-to-partition mapping. is correct. HashPartitioner/RangePartitioner. This matches the core idea being tested around how is partitioning (rdd) best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q85. Which option best describes persist/cache?
Select an answer to check.
Answer: Keep RDD across actions in memory/disk.
Keep RDD across actions in memory/disk. is the correct answer here. Use storage levels. This matches the core idea being tested around which option best describes persist/cache. The remaining choices fail because they don’t satisfy the full definition.
Q86. What is the primary purpose of persist/cache?
Select an answer to check.
Answer: Keep RDD across actions in memory/disk.
Here, Keep RDD across actions in memory/disk. is the right choice. Use storage levels. That is exactly the concept behind what is the primary purpose of persist/cache in this context. The remaining choices fail because they don’t satisfy the full definition.
Q87. Which statement about persist/cache is most accurate?
Select an answer to check.
Answer: Keep RDD across actions in memory/disk.
In this case, Keep RDD across actions in memory/disk. is correct. Use storage levels. That is exactly the concept behind which statement about persist/cache is most accurate in this context. The remaining choices fail because they don’t satisfy the full definition.
Q88. How is persist/cache best characterized?
Select an answer to check.
Answer: Keep RDD across actions in memory/disk.
The best option here is Keep RDD across actions in memory/disk.. Use storage levels. That is exactly the concept behind how is persist/cache best characterized in this context. The remaining choices fail because they don’t satisfy the full definition.
Q89. Which option best describes storage levels?
Select an answer to check.
Answer: MEMORY_ONLY, MEMORY_AND_DISK, etc.
For this question, MEMORY_ONLY, MEMORY_AND_DISK, etc. is correct. Trade memory vs durability. That is exactly the concept behind which option best describes storage levels in this context. The remaining choices fail because they don’t satisfy the full definition.
Q90. What is the primary purpose of storage levels?
Select an answer to check.
Answer: MEMORY_ONLY, MEMORY_AND_DISK, etc.
MEMORY_ONLY, MEMORY_AND_DISK, etc. is the correct answer here. Trade memory vs durability. That is exactly the concept behind what is the primary purpose of storage levels in this context. The remaining choices fail because they don’t satisfy the full definition.
Q91. Which statement about storage levels is most accurate?
Select an answer to check.
Answer: MEMORY_ONLY, MEMORY_AND_DISK, etc.
Here, MEMORY_ONLY, MEMORY_AND_DISK, etc. is the right choice. Trade memory vs durability. It fits the requirement in the prompt about which statement about storage levels is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q92. How is storage levels best characterized?
Select an answer to check.
Answer: MEMORY_ONLY, MEMORY_AND_DISK, etc.
In this case, MEMORY_ONLY, MEMORY_AND_DISK, etc. is correct. Trade memory vs durability. It fits the requirement in the prompt about how is storage levels best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q93. Which option best describes RDD checkpointing?
Select an answer to check.
Answer: Save to reliable storage; truncate lineage.
The best option here is Save to reliable storage; truncate lineage.. For long lineages. It fits the requirement in the prompt about which option best describes rdd checkpointing. The remaining choices fail because they don’t satisfy the full definition.
Q94. What is the primary purpose of RDD checkpointing?
Select an answer to check.
Answer: Save to reliable storage; truncate lineage.
For this question, Save to reliable storage; truncate lineage. is correct. For long lineages. It fits the requirement in the prompt about what is the primary purpose of rdd checkpointing. The remaining choices fail because they don’t satisfy the full definition.
Q95. Which statement about RDD checkpointing is most accurate?
Select an answer to check.
Answer: Save to reliable storage; truncate lineage.
Save to reliable storage; truncate lineage. is the correct answer here. For long lineages. It fits the requirement in the prompt about which statement about rdd checkpointing is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q96. How is RDD checkpointing best characterized?
Select an answer to check.
Answer: Save to reliable storage; truncate lineage.
Here, Save to reliable storage; truncate lineage. is the right choice. For long lineages. This is the most accurate statement for how is rdd checkpointing best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q97. Which option best describes when to use RDDs?
Select an answer to check.
Answer: When fine-grained control is needed (UDF graphs).
In this case, When fine-grained control is needed (UDF graphs). is correct. Generally prefer DF/Dataset. This is the most accurate statement for which option best describes when to use rdds. The remaining choices fail because they don’t satisfy the full definition.
Q98. What is the primary purpose of when to use RDDs?
Select an answer to check.
Answer: When fine-grained control is needed (UDF graphs).
The best option here is When fine-grained control is needed (UDF graphs).. Generally prefer DF/Dataset. This is the most accurate statement for what is the primary purpose of when to. The remaining choices fail because they don’t satisfy the full definition.
Q99. Which statement about when to use RDDs is most accurate?
Select an answer to check.
Answer: When fine-grained control is needed (UDF graphs).
For this question, When fine-grained control is needed (UDF graphs). is correct. Generally prefer DF/Dataset. This is the most accurate statement for which statement about when to use rdds is. The remaining choices fail because they don’t satisfy the full definition.
Q100. How is when to use RDDs best characterized?
Select an answer to check.
Answer: When fine-grained control is needed (UDF graphs).
When fine-grained control is needed (UDF graphs). is the correct answer here. Generally prefer DF/Dataset. This is the most accurate statement for how is when to use rdds best characterized. The remaining choices fail because they don’t satisfy the full definition.