Q 01/05

Which colour is on the outer edge of a rainbow?

A) Violet

B) Blue

C) Green

D) Red

Answer · why

D) Red

The full order is red, orange, yellow, green, blue, indigo, violet, remembered as Roy G. Biv.

Q 02/05

Where must the Sun be for you to see a rainbow?

A) Behind you

B) Directly overhead

C) In front of you

D) Below the horizon

Answer · why

A) Behind you

Rainbows always appear in the part of the sky opposite the Sun, and from an aeroplane you can sometimes see the whole circle.

Q 03/05

What are clouds mostly made of?

A) Smoke from fires

B) Fibres like cotton wool

C) Steam from hot volcanoes

D) Tiny water droplets and ice

Answer · why

D) Tiny water droplets and ice

The droplets are so small that they float on rising air, which is why a cloud can hold tonnes of water and still hang in the sky.

Q 04/05

What do we call a cloud that forms right at ground level?

A) Fog

B) Frost

C) Haze

D) Smog

Answer · why

A) Fog

By definition it cuts visibility to under one kilometre; anything lighter is called mist.

Q 05/05

Which cloud type is the tall, anvil-topped one that produces thunderstorms and hail?

A) Cirrus

B) Cumulonimbus

C) Stratus

D) Altocumulus

Answer · why

B) Cumulonimbus

These giants can tower 12 kilometres high, and the flat anvil forms when the rising air hits the top of the troposphere and spreads out.

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