70+ Physicswallah Interview Questions and Answers

The interview question focuses on algorithm design and programming ability, specifically on the TREE data structure.

• Study the TREE data structure thoroughly

• Focus on traversals and AVL TREE insertions and deletions

• Basic knowledge in algorithm design and reasoning is important

• Solve algorithm design questions in the form of flow charts

• Fill in the blank spaces in the flow chart with appropriate steps

The advice is to not spend too much time on a single question and instead focus on solving other questions within the time limits.

• Manage time effectively

• Prioritize questions based on difficulty

• Skip difficult questions and come back to them later

• Practice solving questions under time constraints

• Utilize shortcuts and techniques to solve questions quickly

Use the Sieve of Eratosthenes algorithm to find prime numbers between 1 to 1 million.

• Implement the Sieve of Eratosthenes algorithm which marks multiples of each prime number as composite.

• Start with a list of numbers from 2 to 1 million, mark 0 and 1 as non-prime.

• Iterate through the list, starting from 2, mark all multiples of each number as non-prime.

• The numbers left unmarked after the iteration are prime numbers.

The probability that three ants at the corner of a triangle will never meet.

• The ants can move randomly in any direction.

• The probability depends on the shape and size of the triangle.

• The probability can be calculated using geometric probability or simulation.

• Assumptions need to be made about the ants' movement patterns.

Bonds are debt securities issued by corporations or governments, while loans are agreements between a borrower and a lender.

• Bonds are typically traded on the open market, while loans are private agreements

• Bonds have a fixed maturity date and interest rate, while loans may have variable terms

• Bonds are usually issued in large denominations, while loans can be tailored to individual needs

SQL is a programming language used for managing and manipulating relational databases.

• SQL is used to retrieve, insert, update, and delete data from databases.

• It uses structured query language to communicate with the database management system (DBMS).

• SQL queries can be used to filter, sort, and aggregate data.

• Aggregate functions like SUM, COUNT, AVG, MAX, and MIN can be used to perform calculations on data.

• Understanding database concepts like tables, columns, primary keys, for...read more

White box testing is a method of testing where the internal structure and implementation details of the software are known and tested. Black box testing is a method of testing where the internal structure and implementation details of the software are unknown and only the inputs and outputs are tested.

• White box testing is also known as clear box testing, glass box testing, or structural testing.

• It focuses on testing the internal logic, code paths, and branches of the software...read more

To swap two numbers without using a third variable, use arithmetic operations like addition and subtraction.

• Store the sum of the two numbers in one of the variables, then subtract the other number from the sum to get the value of the first variable.

• Finally, subtract the value of the first variable from the sum to get the value of the second variable.

Print a pattern using code

• Use nested loops to iterate through rows and columns

• Use string concatenation to build each row of the pattern

• Print each row to display the pattern

Yes, I am okay with travelling to Goregaon.

• I am comfortable with travelling to Goregaon for work purposes.

• I have no issues with commuting to Goregaon for meetings or projects.

• I am willing to travel to Goregaon as required for the job.

Power Apps can be used for creating custom reporting and automating business processes.

• Power Apps can connect to various data sources to pull in data for reporting purposes.

• Users can create custom dashboards and reports using Power Apps to visualize data.

• Automation can be achieved by creating workflows and processes within Power Apps.

• Examples: Creating a Power App to track sales leads and generate reports, automating approval processes using Power Apps.

Swaptions are options on interest rate swaps. Option pricing involves calculating the expected future value of the underlying asset.

• Swaptions give the holder the right to enter into an interest rate swap at a future date.

• Pricing involves calculating the expected future value of the underlying asset using models such as Black-Scholes or binomial trees.

• Factors that affect option pricing include the underlying asset price, strike price, time to expiration, volatility, and intere...read more

Merge two arrays without using a third array.

• Use the concat() method to merge the arrays.

• Alternatively, you can use the push() method to add elements from one array to another.

• Remember to handle the case where the arrays have different lengths.

I have used a variety of tools including Excel, SQL, Tableau, Python, and Power BI.

• Excel

• SQL

• Tableau

• Python

• Power BI

DSA stands for Data Structures and Algorithms. Sorting is the process of arranging data in a particular order. Array is a data structure that stores elements of the same data type in contiguous memory locations, while linked list is a data structure that stores elements in nodes with pointers to the next node.

• DSA stands for Data Structures and Algorithms

• Sorting is the process of arranging data in a particular order

• Array stores elements of the same data type in contiguous memo...read more

The Internet is a global network of computers that communicate with each other using standardized protocols.

• The Internet is made up of millions of interconnected devices, including computers, servers, routers, and switches.

• Data is transmitted over the Internet in the form of packets, which are small units of information.

• The Internet uses a set of protocols, such as TCP/IP, to ensure reliable and efficient communication.

• When you access a website or send an email, your device s...read more

The number of classes required for the page can be calculated by dividing the total number of elements by the number of elements in each class.

• Count the total number of elements on the page

• Count the number of elements in each class

• Divide the total number of elements by the number of elements in each class to get the number of classes required

I prefer to work in a location that offers a vibrant and diverse community, with access to cultural events and opportunities for personal growth.

• I value a location that has a strong sense of community and offers a variety of cultural activities.

• Access to educational and personal growth opportunities is important to me.

• I am open to considering different locations that meet these criteria.

Optimal solution for sorting an array of strings using built-in sorting algorithm in Java.

• Use Arrays.sort() method to sort the array of strings in Java.

• Ensure to import the Arrays class before using the sort() method.

• Example: String[] arr = {"banana", "apple", "orange"}; Arrays.sort(arr);

HTTP is unsecured while HTTPS is secured with SSL/TLS encryption.

• HTTP stands for Hypertext Transfer Protocol, while HTTPS stands for Hypertext Transfer Protocol Secure.

• HTTP operates on port 80, while HTTPS operates on port 443.

• HTTP data is transmitted in plain text, while HTTPS data is encrypted using SSL/TLS.

• HTTPS provides authentication, integrity, and confidentiality of data exchanged between a client and a server.

• Websites using HTTPS have a padlock icon in the address bar...read more

I resolve conflicts within teams by promoting open communication, active listening, and facilitating constructive discussions.

• Encourage open communication among team members to address issues early on

• Practice active listening to understand all perspectives involved

• Facilitate constructive discussions to find mutually beneficial solutions

• Mediate conflicts impartially and ensure all parties feel heard and respected

A basic Google Doc editor designed using OOP principles.

• Create a Document class to represent the Google Doc

• Include methods for editing text, adding images, and formatting

• Use classes like Text, Image, and FormattingOptions for different elements

• Implement features like undo/redo functionality and collaboration tools

Derivatives are financial contracts that derive their value from an underlying asset or security.

• Types of derivatives include futures, options, swaps, and forwards.

• Futures are contracts to buy or sell an asset at a predetermined price and date.

• Options give the buyer the right, but not the obligation, to buy or sell an asset at a predetermined price and date.

• Swaps involve exchanging cash flows based on different financial instruments.

• Forwards are similar to futures, but are cu...read more

The diameter of a binary tree is the number of nodes on the longest path between two leaves in the tree.

• The diameter of a binary tree can be calculated by finding the height of the left subtree, the height of the right subtree, and adding them together.

• The diameter may or may not pass through the root of the tree.

• Example: In a binary tree with nodes 1, 2, 3, 4, 5, the diameter would be 4 (passing through nodes 4, 2, 1, 3, 5).

Synchronous methods block the execution until the task is completed, while asynchronous methods allow the program to continue executing other tasks while waiting for the result.

• Synchronous methods wait for the task to complete before moving on to the next task.

• Asynchronous methods allow the program to continue executing other tasks while waiting for the result.

• Synchronous methods are easier to understand and debug, but can lead to performance issues if used inappropriately.

• As...read more

Mutual funds pool money from multiple investors to invest in a diversified portfolio, while hedge funds are more exclusive and use more aggressive strategies.

• Mutual funds are open to all investors, while hedge funds are typically only available to accredited investors.

• Mutual funds are regulated by the SEC, while hedge funds have more flexibility in their investment strategies.

• Mutual funds are more diversified and have lower fees compared to hedge funds.

• Examples: Vanguard 500 ...read more

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and the new date and time API.

• Lambda expressions allow you to pass functionality as an argument to a method.

• Functional interfaces have a single abstract method and can be used with lambda expressions.

• Streams provide a way to work with sequences of elements and perform aggregate operations.

• The new date and time API provides improved date and time handling capabilities.

• Default m...read more

The question asks to find the frequency of a specific string in a large paragraph.

• Use a loop to iterate through each word in the paragraph

• Compare each word with the given string

• Keep a count of the number of times the string appears

Mutual funds are investment vehicles that pool money from multiple investors to invest in a diversified portfolio of securities.

• Mutual funds are managed by professional fund managers

• Types of mutual funds include equity funds, bond funds, money market funds, and balanced funds

• Equity funds invest in stocks, bond funds in bonds, money market funds in short-term debt securities, and balanced funds in a mix of stocks and bonds

Deferred revenue is the income received in advance for goods or services that are yet to be delivered or rendered.

• Deferred revenue is also known as unearned revenue.

• It is a liability on the balance sheet until the goods or services are delivered or rendered.

• Examples include magazine subscriptions, prepaid rent, and gift cards.

• Deferred revenue is recognized as revenue on the income statement when the goods or services are delivered or rendered.

Count the number of ones in a given number using pseudo code

• Initialize a count variable to 0

• Iterate through each bit of the number and check if it is 1

• Increment the count if the bit is 1

• Return the count as the result

UseState() is a hook in React that allows functional components to have state variables.

• useState() is used to declare state variables in functional components.

• It returns an array with two elements: the current state value and a function to update it.

• The function to update the state can be called with a new value or a function that takes the previous value as an argument.

• Example: const [count, setCount] = useState(0);

• Example: setCount(prevCount => prevCount + 1);

IRS is the Internal Revenue Service responsible for collecting taxes in the US, while TRS is the Teacher Retirement System providing retirement benefits for educators.

• IRS stands for Internal Revenue Service and is responsible for collecting taxes in the United States.

• TRS stands for Teacher Retirement System and provides retirement benefits for educators.

• IRS deals with tax collection and enforcement, while TRS focuses on managing retirement funds for teachers.

• Example: IRS coll...read more

Fundamental analysis is a method of evaluating a security by analyzing the financial and economic factors that influence its value.

• Involves analyzing financial statements, earnings reports, market trends, and economic indicators

• Focuses on determining the intrinsic value of a security

• Helps investors make informed decisions based on the underlying fundamentals of a company

• Contrasts with technical analysis which focuses on price movements and historical data

Strength is the ability to overcome challenges and obstacles, both physically and mentally.

• Physical strength is the ability to exert force and lift heavy objects.

• Mental strength is the ability to stay resilient in the face of adversity.

• Strength can also refer to emotional resilience and the ability to cope with difficult situations.

• Strength can be developed through consistent practice and perseverance.

• Examples of strength include weightlifting, endurance sports, and overcomin...read more

File types refer to the format in which data is stored in a computer system.

• File types determine how data is organized and accessed

• Common file types include .txt, .jpg, .mp3, .pdf

• Each file type has specific characteristics and uses

Derivatives mutual funds are investment funds that invest in a variety of derivative securities.

• Derivatives mutual funds use derivatives such as options, futures, and swaps to achieve their investment objectives.

• These funds can provide investors with exposure to a wide range of asset classes and strategies.

• Investors should be aware of the risks associated with derivatives, including leverage and potential for loss.

• Examples of derivatives mutual funds include those focused on ...read more

Derivatives are financial instruments whose value is derived from an underlying asset or group of assets.

• Types of derivatives include options, futures, forwards, and swaps.

• Options give the holder the right, but not the obligation, to buy or sell an asset at a specified price before a certain date.

• Futures are contracts to buy or sell an asset at a specified price on a future date.

• Forwards are similar to futures but are customized contracts traded over-the-counter.

• Swaps involve...read more

ReactJS is a JavaScript library for building user interfaces.

• Developed by Facebook

• Uses a virtual DOM for efficient updates

• Supports server-side rendering

• Can be used with other libraries and frameworks

• Uses JSX syntax to write HTML-like code in JavaScript

• Example: Facebook, Instagram, Airbnb, Netflix use ReactJS

The question is asking about how to find the frequency of each character in a given string.

• Iterate through the string and count the occurrences of each character

• Store the counts in a data structure like a hashmap or array

• Return the counts for each character

Global Interpreter Lock (GIL) in Python restricts execution of multiple threads at once to prevent race conditions.

• GIL is a mutex that protects access to Python objects, preventing multiple threads from executing Python bytecodes at once.

• This means that even in a multi-threaded Python program, only one thread can execute Python code at a time.

• GIL can limit the performance of multi-threaded Python programs, especially for CPU-bound tasks.

• However, for I/O-bound tasks, GIL may n...read more

BlackRock is a global investment management corporation that provides a variety of financial services.

• BlackRock is a multinational investment management corporation based in the United States.

• They offer a wide range of financial services including asset management, risk management, and advisory services.

• BlackRock is known for its expertise in managing exchange-traded funds (ETFs) and other investment products.

• The company serves clients worldwide, including individuals, instit...read more

Asset refers to any resource owned by a person or company, while equity represents ownership in a company.

• Asset is a tangible or intangible resource owned by an individual or company, such as cash, property, or equipment.

• Equity represents ownership in a company and is calculated as total assets minus total liabilities.

• Assets can include stocks, bonds, real estate, and cash, while equity is typically represented by shares in a company.

• Assets are listed on the balance sheet of ...read more

Derivatives are financial instruments whose value is derived from an underlying asset or group of assets.

• Types of derivatives include futures, options, swaps, and forwards.

• Derivatives can be used for hedging, speculation, or arbitrage.

• Examples of derivatives include stock options, commodity futures, and interest rate swaps.

Asset classes are groups of securities that exhibit similar characteristics and behave similarly in the market.

• Asset classes include stocks, bonds, real estate, commodities, and cash equivalents.

• Investors can diversify their portfolios by investing in different asset classes.

• Each asset class has its own risk and return characteristics.

• Asset allocation involves determining the optimal mix of asset classes based on an individual's risk tolerance and investment goals.

A program to find prime numbers within a given range

• Iterate through numbers in the given range

• Check if each number is divisible by any number other than 1 and itself

• If not divisible, it is a prime number

Internal audit allows me to utilize my analytical skills to identify risks, improve processes, and add value to the organization.

• Opportunity to identify and mitigate risks within the organization

• Improving processes and operational efficiency

• Contributing to the overall success and growth of the organization

• Utilizing analytical skills to provide valuable insights

• Continuous learning and development in a dynamic environment

ALADIN tool is a software used for managing client relationships and providing personalized services.

• ALADIN stands for Automated Learning and Decision Intelligence Network.

• It helps in analyzing client data to provide personalized recommendations and services.

• The tool uses machine learning algorithms to improve client servicing and satisfaction.

• ALADIN tool can be used in various industries such as finance, healthcare, and retail.

• It streamlines communication and enhances client...read more

Find the length of the longest increasing subsequence in an array.

• Use dynamic programming to solve this problem efficiently.

• Iterate through the array and keep track of the longest increasing subsequence ending at each index.

• Example: For array [10, 22, 9, 33, 21, 50, 41, 60, 80], the longest increasing subsequence is [10, 22, 33, 50, 60, 80] with length 6.

Derivatives are financial instruments whose value is derived from an underlying asset or group of assets.

• Derivatives can be used for hedging, speculation, or arbitrage.

• Common types of derivatives include options, futures, forwards, and swaps.

• Derivatives allow investors to take on leverage and potentially amplify returns.

• They are often used by institutional investors and traders to manage risk and enhance portfolio performance.

Java 8 introduced several new features including lambda expressions, streams, and functional interfaces.

• Lambda expressions allow for more concise code by enabling functional programming.

• Streams provide a way to process collections of objects in a functional style.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Java 8 also introduced the Optional class to handle null values more effectively.

Merging 2 sorted arrays into a single sorted array.

• Create a new array to store the merged array

• Compare the first elements of both arrays and add the smaller one to the new array

• Repeat until one of the arrays is empty, then add the remaining elements of the other array

• Return the merged array

Find the 2nd largest string in an array of strings.

• Iterate through the array and keep track of the largest and second largest strings.

• Compare each string with the current largest and second largest strings to update them accordingly.