1) Find the mode for the following numbers - 7,2,5,3,8,5,5 a) 7 b) 4.5 c) 5 d) 2.5 2) Find the median for the following numbers - 1,7,2,5,3,1,1,4 a) 2.5 b) 5 c) 7 d) 1 3) Transpose and solve the following for b. a + b = c a) b = a + c b) a = c - b c) b = c / a d) b = c - a 4) Transpose and solve the following for R. I = V/R a) R = V X I  b) R = V / I c) R = I X R d) R = I / R 5) The following tester should be connected in parallel a) Ammeter b) Voltmeter c) Ohmmeter d) Wattmeter 6) The following tester can be used to measure current without becoming part of the circuit a) Voltmeter b) Ohmmeter c) Clamp meter d) Multi-function meter 7) A bundle of steel trunking has a mass of 20kg. When the trunking is lifted, what is its weight? (W = m x g) a) 196.2N b) 208.5N c) 100N d) 204.1N 8) Power = ? a) work done x time taken b) work done / time taken c) time taken x gravity d) Newton x Gravity 9) Which one of these is the second best conductor? a) Silver b) Copper c) Air d) Aluminium 10) Which of these is material that cant be recycled? a) Copper b) Thermosetting c) Thermoplastic d) Aluminium 11) Which of these has a negative charge? a) Electron b) Nucleus c) Air d) Copper 12) Resistivity is to do with a conductor’s a) length b) size c) insulation d) material 13) If the area of a conductor doubles, its resistance will  a) double b) halve c) increase d) remain the same 14) The ease at which current flows through a conductor will depend upon its a) insulation b) colour c) resistance d) termination 15) What remains constant in a series circuit? a) resistance b) voltage c) current d) potential difference 16) What kind of component is used as a current limiter? a) capacitor b) resistor c) diode d) transistor 17) What kind of semiconductor device is used to control the speed of AC motors? a) Diac b) Zener Diode c) Triac d) Thyristor 18) What allows current to flow in one direction only? a) Relays b) Diodes c) Thermistor d) Resistor 19) What monitors the actual distance to an object a) Ultrasound b) Active infared c) Passive infared d) Multi-sensor detector 20) What type of transformer is this? a) Auto transformer b) Shell type c) Core type d) Safety 21) What multiplication factor is kilo? a) 103 b) 105 c) 101 d) 104 22) What is 30mA equal to? a) 0.30A b) 0.03A c) 3.0A d) 30A 23) What is the resistivity of copper? a) 16.4 x 10-9 b) 17.5 x 10-9 c) 28.5 x 10-9 d) 16.4 x 10-7 24) What is the symbol for resistivity? a) P b) R c) ρ d) r 25) In regards to resistors in parallel.... a) Only one path for the current to flow. b) Current is therefore the same and common to all resistors. c) Total resistance is determined by adding up all values d) Voltage is common to all resistors. 26) Atoms within a liquid... a) are able to move around although they maintain their volume b) have no volume or shape, they can move freely from one another c) are attached to each and do not move around d) inherit a unique material classification 27) Conductors provide very little resistance to the flow of current. This means that their conductance is.... a) very low b) very high c) fluctuating d) non existant 28) What application does not include electromagnetism? a) transformers b) generators c) motors d) heating appliances 29) Gravity =  a) 9.80 m/s2 b) 9.81m/s2 c) 8.91 m/s2 d) 9.18 m/s2 30) efficiency = a) output power/input power x 1000 b) output power/input power x 100 c) input power / output power x 230 d) input power / output power x 100

Electrical Science

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