Tech engineers are some of the smartest people in the world. But even they have a hard time answering the brain teaser questions a lot of tech companies like to ask during job interviews. We went through Glassdoor to find out some of the trickiest brain teaser questions they get asked, and we have provided all those questions for you.

Before solving there we will recommend to read this article.(How to Answer a Weird Interview Question ?)
Read: 15 BANNED Google Interview Questions in Job Interview (But other companies are asking)

Brain teaser Interview Questions | SET 1

Q1: A woman shoots her husband. Then she holds him underwater for over 10 minutes. Finally, she hangs him. But 10 minutes later, they both go out and enjoy a wonderful dinner together. How can this be?
Q2: There are three switches outside of a closed room to operate three different light bulb inside the room. You can only go into the room once and you need to determine which switch belongs to which bulb. Just to make it clear, room is perfectly locked and it's not possible to determine whether lights are on from outside the room.
Q3: How many months during this year can have twenty eight days ?
Q4: You are driving along in your car on a wild, stormy night, it’s raining heavily, when suddenly you pass by a bus stop, and you see three people waiting for a bus:1. An old lady who looks as if she is about to die.2. An old friend who once saved your life.3. The perfect partner you have been dreaming about.Which one would you choose to offer a ride to, knowing very well that there could only be one passenger in your car?
Q5: You have a 5 liter Jug and a 3 liter Jug and Free supply of water. You need to measure exactly 4 liter of water but there is no measuring instrument or cup. Also Jugs are oddly shaped and doesn't contain any mark.
Q6: On a sunny day, two fathers and two sons decided to go fishing. After an hour, each one of them was able to catch 1 fish. Then, they returned home and placed all the three fishes in a vessel. How come they had only three fishes in total? If No fish was lost or eaten by them.
Q7: Ramesh and Suresh are playing lawn tennis together. They decide to play a set of three. After the sets, both of them win each three sets. How is this possible?
Q8: A taxi driver was going the wrong way on a one-way road. A traffic police officer noticed him but instead of stopping him or fine him, he let the driver go.
Q9: You have 5 Jars filled with marbles. Each marble weighs 10 gm, except one Jar which contains defective marbles which weighs 9 gm. Given a scale to weigh, How do you find Jar with defective marbles in just one measurement. Here scale is modern day electronic scale to measure weight.
Q10: A person's age is many days as his father's age in weeks and as many month as his grand father's age in years. If you combine age of all three it comes 120 years. What is the age of all three?

Brain teaser Interview Questions | SET 2

Q11: A man builds a house with four sides of rectangular construction, each side having a southern exposure. A big bear comes along. What color is the bear?
Q12: If you had only one match, and entered a dark room containing an oil lamp, some newspaper, and some kindling wood, which would you light first?
Q13: Take two apples from three apples and what do you have?
Q14: A farmer had 17 sheeps. All but 9 died. How many live sheep were left?
Q15: Interviewer said “I shall either ask you ten easy questions or one really difficult question.Think well before you make up your mind!”
Q16: Divide 30 by half and add 10 what do you get?
Q17: HITTMAN was in an interview. The interviewer told him that this is his last question and then he asked him to point at the exact center of the table on which his resume was kept. He gave an answer after which he was selected. Can you think of what happened in the interview room?
Q18: I went to bed at eight in the evening last night and I wound up my clock and set my alarm to sound for nine o'clock in the morning. How many hours sleep did I get?
Q19: How Can U Make 120 With 5 Zeros?
Q20: There is a rectangular shaped cake of arbitrary size. We cut a rectangular piece (any size or orientation) from the original cake. How would you cut the remaining cake into two equal halves in a straight cut of a knife?

Brain teaser Interview Questions | SET 3

Q21: You have a birthday cake and have exactly 3 slices to cut it into 8 equal pieces. How do you do it?
Q22: Interviewer ordered a cup of coffee for the candidate. Coffee arrived kept before the candidate, then he asked what is before you?
Q23: How can you cut a pizza into 3 equal sized pieces with a single cut using a knife ?
Q23: Find the weight of an object attached to another object without detaching them and without using any weighing machines. Both the weights are unknown
Q24: When does an Indian Potato changes its nationality ?
Q25: There is a disk half painted white and the other half black. There are two sensors and the outputs of these sensors are the only signals available. How will you determine if the disk is rotating clockwise or anti-clockwise?
Q26: A Graduate Student Came for Interview , He Clear All Previous Round Was Waiting for Final Hr Round. His Turns Come Interviewer Asked : You Have Some Knowledge in India History ? Candidate : Yes. Interviewer : How Would India Be Different, if It Had Been Ruled by the French Instead of the British?
Q27: Interviewer (to a student girl candidate) – What is one morning you woke up & found that you were pregnant.
Q28: There is a blank disc( like a cd). You are given two colors of paint (black and white) . A sensor can recognize the color painted on the disc and produce an output. Paint the disc in a way such that you can find the direction of rotation by looking at the output.
Q29: Interviewer: take a look at the poster behind me. In the poster there is a beautiful girl, a bottle of expensive wine, and an expensive car; if you could only choose one of the three items, which would you choose and why?
Q30: What will you do if I run away with your sister?

Brain teaser Interview Questions | SET 4

Q31: You have a 5 liter Jug and a 3 liter Jug and unlimited supply of water. You need to measure exactly 4 liter of water but there is no measuring instrument or cup. Also Jugs are oddly shaped and doesn't contain any mark.
Q32: According to famous saying "Two's company, and three's a crowd " then whats four and five?
Q33: Interviewer: From Newyork took a helicopter and traveled 200km to north and 200km to east and 200km to the south and finally 200km to the west. Now where you are ?
Q34: An Interview was lined up, many of them failed to put answer the question was being asked by Interviewer Now, HITTMAN turn comes Interviewer: What can you make from this piece of paper?
Q35: What do you call a fish without an Eye?
Q36: You have done well in all rounds and have a brilliant career, But I want to reject you! Tell me the reason so that I can reject you !!!
Q37: An bacteria grows at the speed that it will double its volume per minute. If you put it in a jar, it will fill the jar in one hour. how long will it take to fill a half of the jar?
Q38: Do you know Java?if your answer is yes then you will be asked questions about .Net.
Q39: 9 identical balls. one ball is heavy. Find the heavy ball with the minimum number of measurements.
Q40: How can you add eight eights to reach 1000?

Brain teaser Interview Questions | SET 5

Q41: You’re about to get on a plane to Seattle. You want to know if it’s raining. You call 3 random friends who live there and ask each if it’s raining. Each friend has a 2/3 chance of telling you the truth and a 1/3 chance of messing with you by lying. All 3 friends tell you that “Yes” it is raining. What is the probability that it’s actually raining in Seattle?
Q42: A Russian gangster kidnaps you. He puts two bullets in consecutive order in an empty six-round revolver, spins it, points it at your head and shoots. *click* You’re still alive. He then asks you, “do you want me to spin it again and fire or pull the trigger again right away?” For each option, what is the probability that you’ll be shot?
Q43: There are 20 different socks of two types in a drawer in a completely dark room. What is the minimum number of socks you should grab to ensure you have a matching pair?
Q44: How many trailing zeros are in the number 5! (5 factorial)?
Q45: You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can’t feel, see or in any other way find out which 10 are heads up. Your goal: split the coins into two piles so there are the same number of heads-up coins in each pile.
Q46: If you have a square room with no roof, and you had four flagpoles you had to plant on the walls so that each flagpole touched two walls, how would you do it?
Q47: There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of its box. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, how can you immediately label all of the boxes correctly?
Q48: You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can’t feel, see or in any other way find out which 10 are heads up. Your goal: split the coins into two piles so there are the same number of heads-up coins in each pile.
Q49: There are 27 coins and a two-pan balance. All coins has same weight except for one, which is heavier than all others. All coins looks identical. What is the minimum number of weighing required to certainly find out heavier coin?
Q50: Two persons are walking into a railway tunnel. Upon crossing 2/3rd of the tunnel, they saw a train is coming from opposite direction. Each person ran for a different end of tunnel with speed of 10 km per hour. Fortunately, both persons escaped from the tunnel just right time i.e.. at the time train would have run through them. Assuming train was running with a constant speed and both persons reacted immediately, Find out speed of train.

Brain teaser Interview Questions | SET 6

Q51: How Many Type Questions: How many cows are in Canada?, How many street lights are there in New York City? How many gas stations are there in the United States? How many barbers are there in Chicago?
Q52: Why Type Questions:1. Why is a tennis ball fuzzy? 2. Why are manhole covers round?
Q53: Explain Type Questions: 1. Describe the internet to someone who just woke up from a 30-year coma. 2. Describe the benefits of wearing a seatbelt 3. Describe the color yellow to a blind person. 4. Teach me how to make an omelet.
Q54: Something Ridiculous Type Questions: 1. How would you fight a bear? 2. How would you kill a giraffe? 3. Where is God?
Q55: Numerical Type Brain Teasers: 1. What is the sum of the numbers one to 100? 2. You’ve got a 10 x 10 x 10 cube made up of 1 x 1 x 1 smaller cubes. The outside of the larger cube is completely painted red. On how many of the smaller cubes is there any red paint? 3. What is the angle between the hour-hand and minute-hand of a clock at [time]? 4. If I roll two dice, what is the probability the sum of the amounts is nine? 5. A shop owner can fit 8 large boxes or 10 medium boxes into a container for delivery. In one consignment, he distributes a total of 96 boxes. If there are more large boxes than medium boxes, how many cartons did he ship?
Q56: How Many Can Fit Type Questions: 1. How many basketballs would fit in this room? 2. How many ping pong balls could fit in a Boeing 747? 3. How many gallons of paint does it take to paint the outside of the White House? 4. How many trees are there in NYC’s Central Park?
Q57: Estimate Type Questions: How much should you charge to wash all the windows in Seattle?
Q58: Mystry Type Questions: A newlywed couple went for hiking trip outside the country. After two days, the wife returned and informed the police that her husband fell while hiking and could not survive. Police registered the case. The next day, they returned to her home and arrested her. On asking why they have arrested her, the police told her that her travel agent had called and they are arresting her for the murder of her husband. How do you think the travel agent knew about the murder?
Q59: Observation about the problem: How would you test a calculator that is going to be used by elementary school aged children?

Brain teaser Interview Questions | SET 7

Q61: How would you fight a bear?
Q62: How would you kill a giraffe?
Q63: How much should you charge to wash all the windows in Seattle?
Q64: Teach me how to make an omelet.
Q65: Describe the benefits of wearing a seatbelt
Q66: How many gas stations are there in the United States?
Q67: How do you value the hot dog stand at Union Square in New York City?
Q68: There's a 10x10x10 cube made of 1,000 1x1x1 cubes if you get rid of the outer layer of cubes how many do you have left?
Q69: My bank wants to send me to Shanghai, but my wife refuses to move there. Pretend I'm my wife, sell the new position in Shanghai to me and convince me to move to China.
Q70: Sell me my blackberry

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Brain Teaser Interview Questions and Answers