1) Why does an object become charged? a) Gains/Loses protons b) Gains/Loses electrons c) Gains/Loses neutrons 2) What will these two objects do? a) Attract b) Repel c) Nothing 3) Which one of these is not dangerous? a) Dust and dirt on TV screens b) Mobile phones in petrol stations c) Refuelling aeroplanes d) Cleaning oil tankers 4) Which one will not reduce the chance of an electric shock? a) Connecting an earth wore b) touching a conductor c) wearing thick soled shoes d) Standing on an insulating mat 5) What is the charge of the particles at the bottom of the chimney? a) positive b) negative c) neutral d) Impossible to tell 6) What charge will the particles have when they pass through the grid? a) positive - they gain electrons b) negative - they lose electrons c) negative - they gain electrons d) positive - they lose electrons 7) Which of these is not a use of static electricity? a) Photocopying b) Paint Spraying c) Crop Dusting d) Knitting 8) What are the advantages of electrostatic paint spraying? (2 answers) a) Less wasted paint b) Better colours c) Even coat d) Quick 9) How does a defibrillator work? a) Charges pass through the heart and make it contract b) The positive plate attracts the negative plate c) Lose your charge to the operator 10) What is the job of the earth wire? a) Completes the circuit by providing a return path b) Prevents electric shocks by earthing the casing c) Supplies high voltage d) Melts when current is too high 11) Why is a double insulated device special? (2 answers) a) No earth wire required b) Earth wire prevents shocks c) Metal casing d) Plastic casing cannot become chargedPlastic casing 12) A fuse is in a plug connected to 230 V mains. It has a power rating of 1800W. Which fuse should be used in the plug? a) 5 b) 10 c) 13 d) 3 13) If the resistance increases, what will happen to the current? a) decreases b) increases c) nothing d) impossible to tell 14) What is the frequency of ultrasound? a) above 20 kHz b) above 2000 Hz c) above 20 Hz d) below 20,000 Hz 15) What happens to ultrasound when it is transmitted? a) When a boundary is met some ultrasounds reflect and some are transmitted b) At a boundary all ultrasound reflects c) At a boundary all ultrasounds transmit 16) What am I defining? 'The distance between two identical points on a wave' a) wavelength b) frequency c) amplitude 17) What am I defining? 'The number of waves per second' a) wavelength b) frequency c) amplitude 18) What is a rarefaction? (2 answers) a) An area of high pressure b) An area of low pressure c) particles are far apart d) particles are tightly packed 19) Other than scans, how else can ultrasound be used? a) take temperature b) check for broken bones c) break down kidney stones 20) Why do we sometimes have to use ultrasound? (2 answers) a) To see bones b) You can see soft tissue c) To cause mutations d) It is It is not ionising

P4 a-d revision

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