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2. Why does mercury rise in a thermometer? It rises when air pressure drops it rises as air pressure rises It increases in volume when the temperature rises
3. How does blood circulate around the body? By movement of the body It is pumped by the heart It flows from the lungs as you breathe
4. We hear an echo when ... Sound is bounced back from an object we are in a cave Everything is silent
5. How do insects breathe? Through their noses Through their mouths Through hspiracles">Through holes known as spiracles
6. Why do we hear a radio? Sound signals are transmitted through space We switch it on We plug it in
7. Why can we see distant objects better with a telescope? The image is compressed though a small opening A lens magnifier produces a magnified image It brings them nearer
8. Why does a candlewick continue to burn? It is enclosed in a cylinder of wax It is made from special meterial The wick is saturated in paraffin
9. How is water from a fire engine propelled to a great height? by extending the hosepipe By a pump on the engine by adjusting the nozzle
10. Why do balloons filled with helium rise? Helium is lighter than air Helium is a very energetic gas Helium propels them
