1) When atoms have the same amount of protons and electrons, they are? a) Positivley charged b) Negitivly charged c) Neutral d) Unreactive force 2) What is the range of alpha radiation? a) Short - a few centimeters b) Short - a few millimeters c) Mid - 10cm d) High - a few metres 3) What is the most dangerous a) Alpha b) Beta c) gamma d) kaner 4) how can alpha radiation be stopped? a) water b) paper c) led d) a vacuum 5) What is a force caused by Gravity? a) Weight b) Mass c) Acceleration 6) Define Gravity a) An attraction caused by mass b) A force that acts downwards to the centre of the earth c) A force caused by the atmosphere 7) What is weight measured in? a) Mass b) Kg c) Newtons 8) How many planets are in our solar system not including pluto ? a) 9 b) 8 c) 7 d) 10 9) How old is sun light when it hits the earth ? a) 8.5 minutes b) 7.5 minutes c) 8 minutes d) 3 minutes 10) in our solar system how many planets is the earth away from the sun ? a) 4 b) 3 c) 5 d) 2

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