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Have a heart (or several?) – a quick quiz

By , 18 July 2018

We’re counting on you this Double Helix quiz, or perhaps you’re the one counting! Can you calculate what’s needed to get 100% this week?


Congratulations! You’re a real science whiz!

Oh dear! Better brush up before the next quiz!

#1. How many hearts does an octopus have?

Octopuses have three hearts – one to pump blood around the body, and one each for its two gills.

#2. After nitrogen and oxygen, what’s the third most abundant gas in the atmosphere?

Argon is the third most abundant gas in our atmosphere, making up almost 1%.

#3. When fully crewed, how many people live on the International Space Station?

The International Space Station has a full crew of six people. However, there have been up to 13 people there at the same time.

#4. What is the Great Artesian Basin?

The Great Artesian Basin is a giant underground ‘water tank’ covering about 22% of the Australian mainland.

#5. How fast is the speed of sound in air?

The speed of sound is roughly 1235 kilometres per hour at sea level, depending on the temperature. It tends to be slower higher up due to cooler temperatures.

Was I right?

If you’re after more fun science for kids, subscribe to Double Helix magazine!


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