Singtel Interview Questions and Answers

Q1. What is ur background
Ans. 
I have a Bachelor's degree in Computer Science and have completed multiple internships in software development.
• Bachelor's degree in Computer Science

• Multiple internships in software development
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Q1. What makes you a good fit for this role?
Ans. 
I have a strong background in fraud prevention and a keen eye for detecting suspicious activity.
• Extensive experience in fraud prevention techniques

• Strong analytical skills to identify patterns and anomalies

• Excellent attention to detail

• Ability to work well under pressure

• Effective communication skills to interact with customers and colleagues
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Q2. Description of job
Ans. 
Fraud Prevention Representative is responsible for identifying and preventing fraudulent activities within a company.
• Monitor transactions for any suspicious activity

• Investigate potential fraud cases

• Communicate with customers to verify information

• Implement fraud prevention strategies

• Collaborate with law enforcement agencies if necessary
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Q1. LTE Frame Structure
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Q2. Type 1 and Type 2
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Q1. Difference btwn jdk , jre and jvm
Ans. 
JDK is a development kit that includes JRE and tools for developing Java applications. JRE is a runtime environment for executing Java programs. JVM is a virtual machine that runs Java bytecode.
• JDK (Java Development Kit) includes JRE (Java Runtime Environment) and development tools like compiler and debugger.

• JRE (Java Runtime Environment) is a software package that provides the libraries and components necessary for ru...read more
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Q2. Difference btwn static and volatile
Ans. 
Static variables are shared among all instances of a class, while volatile variables are used to indicate that a variable's value will be modified by different threads.
• Static variables are initialized only once at the start of the program and retain their value throughout the program's execution.

• Volatile variables are used to ensure visibility of changes to variables across multiple threads.

• Static variables are accesse...read more
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Q3. What is final keyword
Ans. 
Final keyword is used in Java to declare constants, prevent method overriding, and prevent class inheritance.
• Used to declare constants - value cannot be changed once assigned

• Prevents method overriding - method cannot be overridden in child classes

• Prevents class inheritance - class cannot be extended
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Q4. Difference btwn paralle stream and stream
Ans. 
Parallel stream allows processing elements concurrently, while stream processes elements sequentially.
• Parallel stream can improve performance by utilizing multiple threads for processing.

• Stream processes elements one by one in a sequential manner.

• Example: stream().parallel() vs stream().sequential()
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Q5. What is stream used for
Ans. 
Streams are used in Java to process collections of objects in a functional style.
• Streams allow for concise and readable code when working with collections.

• They support operations like filter, map, reduce, and collect.

• Streams can be sequential or parallel, depending on the processing requirements.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filter(name -> name.startsWith("A")).forEach(S
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It was a combination of coding and aptitude test. The test had four section and each section had it's time limit.

Q1. The interviewer asked me question based on my resume. He also asked me question related to DBMS, OS & DSA.
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Q2. Define polymorphism.
Ans. 
Polymorphism is the ability of an object to take on many forms.
• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It can be achieved through method overloading or method overriding.

• For example, a parent class Animal can have child classes like Dog, Cat, and Bird, each with their own unique implementation of the method 'makeSound'.
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Q3. Difference between SQL & NoSQL.
Ans. 
SQL is a relational database management system, while NoSQL is a non-relational database management system.
• SQL databases use structured query language for defining and manipulating the data.

• NoSQL databases are schema-less and use various data models like key-value, document, columnar, or graph.

• SQL databases are suitable for complex queries and transactions.

• NoSQL databases are horizontally scalable and provide high perf...read more
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Q1. It was a managerial round.
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Q1. It asked me some situational based questions.
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