Welcome to our Apple Quiz, where we sort the fools from the fanboys. How much do you really know about the world's favourite tech company?

We've already tested you on The Life and Times of Steve Jobs (round 1), Notable Apple employees (round 2) and Apple Through the Years (round 3). Now it's time for Round 4, which is all about the world of iOS: the history of the iPhone, iPad and iPod.

The final round is linked at the end of this article. Good luck!

Q1 What software did PC owners use to manage iPods before iTunes?

Q2 How many versions of the iPhone have been released?

Q3 What two things did Steve Jobs say an Apple tablet must lack?

Q4 How many songs did Apple offer with the US launch of the iTunes Music Store in 2003?

Q5 What's the connection between an apartment sold by Jobs and Apple's 2004 iPods?

Q6 What did Jobs say users would need in order to use tablets with screens less than 10 inches?

Q7 At launch in 2008, how many apps were available to download from the iTunes App Store?

Q8 In what year was Apple first able to offer iTunes songs DRM-free?

Q9 Which classic rock band famously and finally allowed their back catalogue to appear on iTunes in 2012?

Q10 What was the 25 billionth song to be downloaded from iTunes in February 2013?

Apple Quiz round 4: The answers

Q1 What software did PC owners use with iPods before iTunes?

Musicmatch Jukebox. In 2002, Apple launched an iPod for Windows with Musicmatch software to help manage users' music library and transfer files. It was abandoned the following year when iTunes for Windows was introduced.

Q2 How many versions of the iPhone have been released?

As of Christmas 2017 there have been 17, by our count - but we would also allow the answer 13, if you (not unreasonably) think the Plus models shouldn't count as separate.

The iPhone was announced in January 2007 and launched the following June. Since then Apple has released the 3G, 3GS, 4, 4s, 5, 5c, 5s, 6, 6 Plus, 6s, 6s Plus, 7, 7 Plus, 8, 8 Plus and X.

Q3 What two things did Steve Jobs say an Apple tablet must lack?

A keyboard and stylus.

A day after attending a dinner party with Bill Gates at which there was talk of a tablet PC that Microsoft was developing, Jobs reportedly gathered his team and said: "I want to make a tablet, and it can't have a keyboard or a stylus. Users would be able to type by touching the screen with their fingers."

Q4 How many songs did Apple offer at the US launch of the iTunes Music Store in 2003?

There were 200,000: have a point if you're within 50,000.

As of 2017 there are more than 35 million.

Q5 What's the connection between an apartment sold by Jobs and Apple's 2004 iPods?

U2. In 2004, Jobs sold his New York apartment to U2 singer Bono for $15m, and Apple introduced the iPod U2 Special Edition.

The device was part of a partnership between Apple, U2 and Universal Music Group, and featured a black enclosure and custom engraving of U2 band member signatures.

Q6 What did Jobs say users would need in order to use tablets with screens less than 10 inches?

Sandpaper, so they could "file down their fingers".

In October 2010, the Apple CEO warned: "There are clear limits of how close you can physically place elements on a touchscreen before users cannot reliably tap, flick or pinch them. This is one of the key reasons we think the 10in screen size is the minimum size required to create great tablet apps."

In October 2012, Apple launched the 7.9in iPad mini. Sandpaper was not included.

Q7 At launch in 2008, how many apps were available to download from the iTunes App Store?

Just 500: have a point if you're within 100. These days you'll find well over 2 million on there.

Q8 In what year was Apple able to offer iTunes songs DRM-free?

Announced on 9 January 2009, Apple's DRM-free format iTunes Plus was backed by the four major music labels and thousands of independent labels. The move also saw higher-quality 256kbps AAC encoded tracks made available.

Q9 Which classic rock band allowed their back catalogue to appear on iTunes in 2012?

AC/DC's entire back catalogue, including 16 studio albums and four live albums, were made available digitally for the first time exclusively on the iTunes Store in November 2012.

The band had held out, reportedly unhappy that individual tracks could be cherry-picked rather than seen in their true context as album tracks.

Q10 What was the 25 billionth song to be downloaded from iTunes in February 2013?

Monkey Drums (Goksel Vancin Remix) by Chase Buch. The song was purchased by Phillip Lüpke from Germany, who received a €10,000 iTunes Gift Card in celebration of downloading the 25 billionth track.

When you're ready, here's the final round!

Apple Quiz Round 5: The Mac