2. You are shrunk to the height of a 2p coin and thrown into a blender. Your mass is reduced so that your density is the same as usual. The blades start moving in 60 seconds. What do you do?

Asked by Google, the answer to this conundrum is jump. Because your density remains the same, your muscles will have the same power as a normal-sized human. This means that you will still be able to jump high enough to clear the blades, even though you're the size of a 2p coin. That's a brain-teaser and a half.

3. A man pushed his car to a hotel and lost his fortune. What happened?

Another one from Google, this one has a much simpler answer: He was playing Monopoly.

4. If I was talking to your best friend, what is one thing they would say you need to work on?

A slightly more straightforward question from Apple, this one asks for a personal response. It's always best to err on the side of caution with these questions - you probably shouldn't, for example, say, "They think I'm lazy and prone to lying".

5. If you had a choice between two superpowers - being invisible or flying - which would you choose?

Microsoft asked this question in an interview for a high level product lead position. It's unlikely that it is intended as a trick question, given that a successful interviewee answered, "That's easy I would choose being invisible since then I could fly." A skeptical person on Glass Door said, "Invisible = you have a fear of something or you are shy. Flying = you don't have a fear of being on stage (good leaders)."

6. If you woke up and had 2,000 unread emails and could only answer 300 of them how would you choose which ones to answer?

In asking this question, recruiters at Dropbox were looking for answers that involved interviewees filtering for emails sent to by their boss.

7. What would you do if you were the one survivor in a plane crash?

Airbnb asks this question of people applying to be trust and safety investigators. The most popular answer on Glass Door is "Be glad that I was flying solo that day". One of the least popular was "I would turn on my cellphone and call you to say that I'll be late for work".

8. What's your favourite 90s jam?

This question from Squarespace judges applicants based on how millennial they are.

9. Jeff Bezos walks into your office and says you can have a    million dollars to launch your best entrepreneurial idea. What is it?

Amazon likes to think big, so this question is probably testing candidates about their ability to come up with creative ideas. That said, a funny answer on given Glass Door could trick them into giving you the job: "I cannot tell you right now, I am in an interview, and once I get hired we can talk about it".

10. You’re in a row boat, which is in a large tank filled with water. You have an anchor on board, which you throw overboard (the chain is long enough so the anchor rests completely on the bottom of the tank). Does the water level in the tank rise or fall?

The answer to this common sense question from Tesla in an interview for a mechanical engineer position is "the water levels fall".  The anchor is more than water, so its displacement as mass, when it is on the boat, is greater than its displacement as volume, when it’s in the water. So if you throw it overboard the water level will fall.