900+ Trainee Interview Questions and Answers

The first question is about keeping track of top 10 trending words in a dynamically changing file. The second question is about finding the length of the longest leaf-to-leaf path in a binary tree. The third question is about navigating through an integer matrix.

• For the first question, you can use a data structure like a priority queue or a hash map to keep track of the word frequencies and update the top 10 trending words accordingly.

• For the second question, you can use a re...read more

The interview questions involve finding repeating numbers in an array, counting the number of times each number is repeated, arranging data elements in increasing order, and finding the row with the maximum number of 1s in a 2D array.

• For Question 1, iterate through the array and use a hash set to track repeating numbers.

• For Question 2, use a hash map to count the occurrences of each number.

• For Question 3, merge all the frames into a single array and sort it.

• For Question 4, us...read more

The second set can follow the first set if the second number of the first set is smaller than the first number of the second set.

• Check if b < c

• If true, the second set can follow the first set

• If false, the second set cannot follow the first set

The plane moves forward during cruise because of the forward momentum it gained during takeoff.

• During takeoff, the plane accelerates and gains forward momentum.

• Once in cruise, the plane maintains its forward momentum even if thrust equals drag.

• The forward momentum allows the plane to continue moving forward.

Overloading is when multiple methods have the same name but different parameters, while overriding is when a subclass provides a specific implementation of a method already defined in its superclass.

• Overloading is compile-time polymorphism, while overriding is runtime polymorphism.

• Overloading is achieved within the same class, while overriding occurs between a superclass and its subclass.

• Overloading is used to provide different ways of calling the same method, while overridin...read more

Ecommerce refers to buying and selling of goods and services online. Popular ecommerce companies include Amazon, Alibaba, and eBay.

• Ecommerce involves online transactions of goods and services

• It has revolutionized the way people shop and has made it more convenient

• Ecommerce companies use various models such as B2B, B2C, C2C, etc.

• Examples of popular ecommerce companies include Amazon, Alibaba, and eBay

• Ecommerce offers a promising career option with opportunities in areas such a...read more

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 does not encrypt data, while HTTPS encrypts data using SSL/TLS.

• HTTP is vulnerable to eavesdropping and data tampering, while HTTPS provides confidentiality and integrity of data.

• HTTPS uses digital certificates to verify the authenticity of websites...read more

Chemistry can be broadly classified into five types based on the type of matter being studied.

• Organic chemistry - study of carbon-based compounds

• Inorganic chemistry - study of non-carbon-based compounds

• Physical chemistry - study of the physical properties and behavior of matter

• Analytical chemistry - study of the composition and properties of matter

• Biochemistry - study of chemical processes in living organisms

ICD-10 is a medical classification system used for coding diagnoses and procedures.

• ICD-10 stands for International Classification of Diseases, Tenth Revision.

• It is used by healthcare providers to accurately code and classify medical diagnoses and procedures.

• ICD-10 codes are alphanumeric codes that provide detailed information about a patient's condition or treatment.

• These codes are used for medical billing, research, and statistical analysis.

• For example, ICD-10 code Z12.31 re...read more

The command for hard disk partition in Linux is fdisk.

• Open the terminal and type 'sudo fdisk /dev/sda' to partition the first hard disk.

• Use 'p' to print the partition table, 'n' to create a new partition, 'd' to delete a partition, 'w' to write changes and 'q' to quit.

• Other partitioning tools in Linux include parted, gparted, and cfdisk.

A program to print random token numbers.

• Generate random numbers using a random number generator

• Convert the numbers to strings and store them in an array

• Print the token numbers from the array

The probability of getting heads or tails when flipping a coin is 50% for each outcome.

• When flipping a fair coin, there are only two possible outcomes: heads or tails.

• Since the coin has no bias, the probability of getting heads is 50% and the probability of getting tails is also 50%.

• This is because there is an equal chance for the coin to land on either side.

• The probability can be calculated by dividing the number of favorable outcomes (1 for heads or 1 for tails) by the tota...read more

Transformer is a device that transfers electrical energy from one circuit to another. Electrical motor converts electrical energy into mechanical energy.

• Transformer works on the principle of electromagnetic induction

• Electrical motor has two main parts - stator and rotor

• DC motor converts electrical energy into mechanical energy through the interaction of magnetic fields

• Armature reaction is the effect of magnetic field produced by the armature current on the main magnetic field...read more

GLR and SSR reactors are different in terms of their design and purpose.

• GLR stands for Gas-Liquid Reactor, while SSR stands for Solid-State Reactor.

• GLR reactors are used for reactions involving gases and liquids, while SSR reactors are used for reactions involving solids.

• GLR reactors typically have a gas phase and a liquid phase, with the reactants and catalysts dissolved or suspended in the liquid phase.

• SSR reactors, on the other hand, have a solid phase where the reactants ...read more

Testing milk or product quality is important to ensure safety, compliance with regulations, and customer satisfaction.

• To ensure the milk or product is safe for consumption

• To comply with quality standards and regulations

• To maintain customer satisfaction and trust

• To identify any contamination or adulteration

• To prevent health risks and foodborne illnesses

• To ensure consistency in taste, texture, and nutritional value

• To detect any spoilage or deterioration

• To verify the accuracy of...read more

CNC codes are instructions used in computer numerical control (CNC) machines to control the movement and operation of tools.

• G-codes: Control the movement and positioning of the machine

• M-codes: Control auxiliary functions such as coolant or spindle speed

• T-codes: Specify the tool to be used

• F-code: Sets the feed rate

• S-code: Sets the spindle speed

• X, Y, Z-codes: Control the movement along the X, Y, and Z axes

We use step-up transformers to reduce power loss during transmission by increasing voltage and decreasing current.

• Step-up transformers increase voltage and decrease current, which reduces power loss during transmission.

• This is because power loss is proportional to the square of the current, so reducing current reduces power loss.

• For example, power is transmitted over long distances at high voltages (e.g. 500 kV) to reduce power loss.

• Step-down transformers are used at the end ...read more

Data Science is the study of data to extract insights and knowledge. Machine Learning is a subset of Data Science that uses algorithms to learn patterns from data.

• Data Science involves collecting, cleaning, analyzing, and interpreting data to make informed decisions

• Machine Learning algorithms include Linear Regression, Decision Trees, Random Forest, K-Means Clustering, and Neural Networks

• I have used Random Forest algorithm in my project to predict customer churn in a telecom ...read more

Nacelles are aerodynamic structures on aircraft that enclose engines. They help in reducing noise by providing sound insulation and directing exhaust gases.

• Nacelles are structures on aircraft that house engines.

• They are designed to be aerodynamic to reduce drag and improve fuel efficiency.

• Nacelles provide sound insulation to reduce noise generated by the engines.

• They also help in directing exhaust gases away from the aircraft and reducing turbulence.

• By reducing noise and impr...read more

Data security and privacy belong to the 'Social' area in the ESG framework.

• Data security and privacy are important social issues that impact stakeholders such as customers, employees, and the general public.

• Organizations need to protect sensitive data from breaches and unauthorized access to maintain trust and credibility.

• Examples include implementing encryption protocols, access controls, and privacy policies to safeguard data.

• Non-compliance with data protection regulations ...read more

Decision tree is a tree-like model used for classification and regression. Keras is a deep learning library and Random forest is an ensemble learning method.

• Decision tree is a supervised learning algorithm that works by recursively splitting the dataset into subsets based on the most significant attribute.

• Keras is a high-level neural networks API written in Python that runs on top of TensorFlow, CNTK, or Theano. It is used for building and training deep learning models.

• Random...read more

The least count of digital vernier caliper is 0.01mm and normal vernier caliper is 0.02mm.

• Digital vernier caliper has a resolution of 0.01mm or 0.0005 inches.

• Normal vernier caliper has a resolution of 0.02mm or 0.001 inches.

• Least count is the smallest measurement that can be read on the scale.

• It is important to know the least count for accurate measurements.

Stay neutral and provide factual information without expressing personal opinions.

• Remain calm and composed

• Avoid expressing personal opinions

• Stick to factual information

• Provide multiple perspectives if applicable

• Encourage further research and discussion

Essential components of milk are water, fat, protein, lactose, vitamins, and minerals. Preservation methods include pasteurization, sterilization, and refrigeration.

• Water is the main component of milk

• Fat provides flavor and texture

• Protein is essential for growth and repair

• Lactose is the primary carbohydrate in milk

• Vitamins and minerals are important for overall health

• Preservation methods include pasteurization, sterilization, and refrigeration

An associated enterprise is a company that has a significant influence over another company's operations.

• An associated enterprise is determined by the level of control or influence it has over another company.

• There are six criteria to determine if a company is an associated enterprise.

• These criteria include ownership, control, management, financial transactions, technology, and business operations.

• For example, if Company A owns more than 50% of Company B, then Company B is co...read more

CNC machines are computer-controlled machines that can perform complex tasks with high precision and accuracy.

• CNC machines use computer programs to control their movements and operations

• Conventional machines are manually operated and require skilled operators

• CNC machines can produce parts with higher accuracy and consistency

• CNC machines can perform multiple operations without the need for manual intervention

• Examples of CNC machines include CNC mills, lathes, routers, and plas...read more

The combination of solder paste in SMT line typically consists of flux, solder powder, and other additives.

• Flux is used to clean and prepare the surfaces to be soldered.

• Solder powder is the main component that forms the solder joint.

• Additives may include thickeners, activators, and other materials to improve the soldering process.

• Example: A common combination is 60% solder powder, 35% flux, and 5% additives.