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The toughest challenge – a quick quiz

By , 5 December 2018

This time you’re up against our hardest quiz yet! If you get even one question right, we think you have fantastic science knowledge. If you answer all five questions correctly? You’re a quiz whiz. Let us know in the comments below!


Congratulations! You are a real science whiz!

Oh dear! Better brush up before the next quiz!

#1. What fuel does the OPAL nuclear reactor use?

The OPAL reactor uses uranium as fuel.

#2. How fast is the International Space Station moving as it orbits Earth?

The International Space Station orbits Earth once every 93 minutes. That means it’s travelling at more than 27 600 kilometres per hour!

#3. What colour is titanium dioxide?

Titanium dioxide is a bright white pigment. It’s commonly used as an ingredient in sunscreen.

#4. When was Velcro patented?

Velcro was patented in 1955. George de Mestral invented Velcro after going for a walk and noticing seeds caught on his clothes and in his dog’s fur.

#5. Which genus of Australian plants are commonly known as bottlebrushes, and typically have bright red flowers?

Callistemon typically have bright red, cylindrical flowers that look like brushes for cleaning bottles.

Was I right?

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Black lightning bolt in purple circle


  1. Last 2 quizes the answers have not come when I clicked was I right.

    1. Hi Graham,
      We’d love to help you! Can you tell me which browser you are using? is it Chrome? Firefox?

    2. Also, if you’re looking for the answers, they are:
      a) Uranium
      c) 27 600 kilometres per hour
      d) White
      c) 1955
      c) Callistemon

  2. Yep that was hard but I got 2 right. Would have been 3 but I second guessed myself.
    Love the weekly questions!

  3. Same problem here too. Safari 9.1.3.

    1. Thanks Richard!
      I’m sorry that the quiz isn’t working for you, but hopefully you found the answers down here. We’ll pass your browser details to the plugin developer and hopefully they can replicate and fix the problem.


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