Python: Replace all occurrences of word: "apple" with "froot" and count no.of occurrences of word: "apple" - in a given string (multiple lines) SQL: 1. Retrieve employee details, drawing the maximum salary in each department 2. Retrieve employee details, who got promotions in all distinct locations - department-wise. Spark: 1. Significance of Spark 2. Explain about Spark Transformations and Actions 3. Diff. between RDDs and Data Frames. 4. Explain Spark project worked-on 5. Describe Spark - Cluster architecture