200+ Practo Interview Questions & Answers | Complete Prep Guide 2025

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Software Developer Interview Questions & Answers

Anonymous

posted on 9 May 2015

Interview Questionnaire

8 Questions

Q1. Implement queue with the help of two stacks

Ans.

Queue can be implemented using two stacks by maintaining the order of elements in the stacks.

Create two stacks, let's call them stack1 and stack2
When an element is enqueued, push it to stack1
When an element is dequeued, pop all elements from stack1 and push them to stack2
Pop the top element from stack2 and return it as the dequeued element
If stack2 is empty, repeat step 3
To get the front element of the queue, peek the

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Q2. Iven a table “student” of with columns Name and Marks. You have to write a SQL query to get the 2nd highest marks from the table. Also write a query to find the nth highest marks, where n can be any number

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Q3. What is left join. Give example. And Full outer join?

Ans.

Left join returns all records from left table and matching records from right table. Full outer join returns all records from both tables.

Left join is used to combine two tables based on a common column.
In left join, all records from the left table are returned along with matching records from the right table.
If there is no match in the right table, NULL values are returned.
Example: SELECT * FROM table1 LEFT JOIN table...

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Q4. What is magic functions and autoloading in PHP?

Ans.

Magic functions are special methods in PHP that start with __. Autoloading is a way to automatically load classes.

Magic functions are used to handle certain events in PHP, such as object creation or property access.
Autoloading allows PHP to automatically load classes when they are needed, without requiring manual includes.
Magic functions can be used in conjunction with autoloading to dynamically load classes or handle

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Q5. Given three arrays sorted in non-decreasing order, print all common elements in these arrays. Examples: ar1[] = {1, 5, 10, 20, 40, 80} ar2[] = {6, 7, 20, 80, 100} ar3[] = {3, 4, 15, 20, 30, 70, 80, 120} Output: 20, 80

Ans.

Given three sorted arrays, find common elements.

Create three pointers to traverse each array
Compare the elements at the pointers and move the pointer of the smallest element
If all pointers point to the same element, add it to the result and move all pointers
Repeat until any pointer reaches the end of its array

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Q6. A puzzle. You will be given with a 3 Litre container & a 7 Litre Container. Measure exactly 5 Litres of water

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Q7. Asked about one of my projects I mentioned in my resume?

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Q8. Find if a number is a power of 2 or not?

Ans.

Check if a number is a power of 2 or not.

A power of 2 has only one bit set in its binary representation.
Use bitwise AND operator to check if the number is a power of 2.
If n is a power of 2, then n & (n-1) will be 0.

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Interview Preparation Tips

Skills: Data structures, PHP, Algortihm
College Name: na
Motivation: Overall it was a very good experience. They test you from every aspect. In the End I would like to say that Practo is one of the best companies to work for.

Skills evaluated in this interview

Software Developer Interview Questions asked at other Companies

Q1. Maximum Subarray Sum Problem Statement Given an array of integers, determine the maximum possible sum of any contiguous subarray within the array. Example: Input: array = [34, -50, 42, 14, -5, 86] Output: 137 Explanation: The maximum sum is... read more

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Senior Android Developer Interview Questions & Answers

Anonymous

posted on 21 Jun 2024

Interview experience

Good

Difficulty level

Moderate

Process Duration

Less than 2 weeks

Result

Selected

I applied via Approached by Company and was interviewed in May 2024. There were 4 interview rounds.

Round 1 - Coding Test

It was a 1.5-hour coding test. We were given three DSA questions to solve. Two of them were Easy to Medium problems and the third one was Medium to Hard question.

Round 2 - Technical

(6 Questions)

Q1. Kotlin interview questions what you'll find in medium posts. (Medium diff)

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Q2. Android Interview Questions that you'll find the medium posts. (Medium Diff)

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Q3. SOLID principle

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Q4. DSA 1 (Whiteboard): A two-pointer array question.

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Q5. DSA 2 (Whiteboard): Leetcode jump-game question

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Q6. Followup on space and time complexity and improvements.

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Round 3 - System Design

(1 Question)

Q1. Design a video streaming app's search page

Ans.

The search page of a video streaming app should allow users to easily search for and discover content.

Include a search bar at the top for users to enter keywords or phrases
Display relevant search results in a grid or list format
Provide filters or sorting options to refine search results
Include thumbnails, titles, and brief descriptions of the search results
Allow users to click on search results to view more details or

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Round 4 - Behavioral