1) This material permits moving charges to pass through. a) Conductor b) Insulator c) Semiconductor d) All these 2) Which of the following material is insulator? a) Copper b) Diode c) Integrated Ciruit d) Paper 3) Which of the following describes the temperature dependence of an insulator? a) The resistance of an insulator increases as the temperature increases. b) The resistance of an insulator decreases in high temperature. c) The resistance of an insulator is very high but still decreases at low temperature. d) All of the above. 4) This material does not permit moving charges to pass through. a) Conductor b) Insulator c) Semiconductor d) All these 5) The following are characteristics in which both insulator and conductor share. Which is NOT? a) Both insulator and conductor are examples of matter. b) Both insulator and conductor share the same hardness and softness. c) Both insulator and conductor share the same atomic composition. d) Both insulator and conductor permit the passage of electric current. e) None of the above 6) This material can permit or does not permit charge to pass through. a) Conductor b) Insulator c) Semiconductor d) All these 7) Why does semiconductor can permit or does not permit charge to pass through? a) Because there is no space on the band gap. b) Because of the moving charge and holes in the band gap. c) Because the wide band gap and no hole. d) All of the above. 8) Which of the following is best example of semiconductor? a) Wood b) Paper c) Integrated Circuit d) Bulb 9) The following are examples of an insulator except____. a) Wood b) Silver c) Rubber d) Paper 10) What is the primary purpose of an insulator? a) To conduct electricity b) To prevent electricity flow c) To increase heat transfer d) To store electric charge 11) Which material is most commonly used as a semiconductor? a) Silicon b) Iron  c) Copper d) Aluminum 12) What characteristic does an insulator typically have? a) High resistivity b) Low melting point c) High density d) High conductivity 13) Which of the following describes the purpose of insulators in transformers? a) Enhancing magnetic fields b) Preventing short circuits c) Reducing resistance d) Increasing current 14) Which material is commonly used as an insulator in electric power lines? a) Copper b) Aluminum c) Glass d) Silver 15) Inside your gadget, like cellphones and computers, there are small part called integrated circuits, diodes, and transistors. There materials are called? a) Conductors b) Transistors c) Semiconductors d) Insulator 16) In which devices are semiconductors primarily used? a) wires b) batteries c) integrated circuits d) light bulbs 17) Why is copper widely used for electrical wiring? a) It is highly resistant to corrosion b) It is a good insulator c) It has high electrical conductivity d) It is magnetic 18) Why are semiconductors essential in electronics? a) They conduct electricity as well as metals b) They do not conduct electricity c) They have flexible conductivity properties d) They cannot be damaged by heat 19) Why do metals generally make good conductors? a) They are light in weight b) Their electrons are loosely bound and move easily c) They have high density d) They do not react with other substances 20) Why do conductors allow electric current to flow easily? a) They have high resistivity b) They have many free electrons c) They do not react with air d) They are flexible 21) What do you call the actions taken in advance to protect against possible danger, failure, or injury? a) Electrical hazards b) Electric drilling c) Soldering d) Safety precautions 22) What does this symbol indicate? a) Danger b) Buried electricity cables c) Explosive d) Flammable gas 23) It is the flow of electric charge in a circuit. a) Electricity b) Electric current c) Power d) Parallel circuit 24) What is any source of potential damage, harm or adverse health effect on something or someone? a) Hazards b) Safety c) Protocols d) Electrical precautions 25) What does this symbol indicate? a) Explosive b) Flammable c) Injury or death due to high voltage equipment d) Buried electricity cables 26) Below are safety equipment EXCEPT: a) Metal jewelries b) Fire extinguisher c) First aid kit d) Mobile phone 27) When working with an electronic project one should not wear: a) Safety goggles b) Rubber gloves c) Loose clothing d) Rubber shoes 28) It is an electrical accident that can have serious, often fatal, affects on a person. a) Electrocution b) Cancer c) Electric shock d) Shortness of breath 29) It is defined as combustion or burning, in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and chemically with oxygen from the air and typically give out bright light, heat, and smoke. a) Fire b) Fog c) Smog d) Earthquake 30) Listed below are some of the safety precautions EXCEPT: a) Always use the right electronics repair and maintenance use. b) Always return covers after removing them to reduce the risk of electric shock. c) Always ensure that all electronics equipment is properly grounded. d) Make sure that your circuit is always overloaded 31) Jimi, a grade 10 student is attending his online class. He just used one extension power outlet to plug his laptop charger, cell phone charger, router, and electric fan. What general safety should Jimi consider? a) Always use the right electronics repair and maintenance tools. b) Make sure your circuit is not overloaded. c) Replacing cables instead of repairing it. d) Always have safety equipment like fire extinguisher. 32) Ms Jane, a newly engaged teacher wears her engagement ring all the time. She didn’t even bother to remove her bracelet and wrist watch too before working on an electric circuit. What personal safety should Ms Jane consider? a) Always work on a dry place. b) Don’t use bare hands to remove hot parts. c) Don’t work with metallic jewelry on hands. d) Don’t wear loose clothes while working 33) After the Christmas Party, Jacobe was asked to return the speakers they used to the owner. When he is about to get the speakers, he noticed some spilled liquids near the speakers and electrical cables. Jacobe didn’t bother and just proceeded to do his deed. What personal safety should he consider? a) Always work on a well-ventilated area. b) Always wear insulator gloves when dealing with electrical equipment. c) Always wear conductive shoes. d) Always work on a dry place. 34) While working in the school laboratory, Jojo noticed that an electrical circuit is burning. The fire is quickly spreading that creates thick smoke, and the electrical wires begin to spark. What should Jojo do? a) Get a bucket of water. b) Leave the laboratory burning. c) Call the police. d) Use a fire extinguisher. 35) While at home, Rolly decided to take a rest and watch a good movie. He turned the television on and a few minutes later, the television suddenly turned off then on. Irritated by what’s happening, Rolly decided to unplug the TV and check it. He noticed a damaged cable and grabbed an insulating tape to repair the cable and proceeded to watching the movie. What safety precaution should Rolly consider? a) Make sure that your circuit is not overloaded. b) Remove any electronic equipment you’re testing or working on from the power source c) Use a fire extinguisher. d) If damaged, replace it, instead of repairing with insulating tape. 36) During their online class in Electronics, Layla noticed that her laptop is in low battery and needs to be plugged in immediately. She has four power outlets and already has three plugged electrical appliances, an electric fan, her mobile phone, and a ring light. Layla without a second thought unplugged her mobile phone charger and plugged her laptop charger in. What safety precaution did Layla considered? a) Make sure that your circuit is not overloaded. b) Always check for signs of wear, defects and fraying on electronic equipment, cables, cords, and connectors c) Avoid anything that would cause a fire around your working area like paper, cloth or other combustible materials. d) Always wear safety goggles. 37) All of the following are electrical safety precautions EXCEPT: a) Always have safety equipment like a fire extinguisher, a basic first aid kit and a mobile phone nearby. b) Look out for damaged wire insulation, overheating of electronic equipment, c) Always make sure that all parts of electronic equipment are not well-mounted to create possible electrical accidents. d) Always read safety procedures that come with every electronic equipment you’re about to test or work on. 38) All of the following are possible electrical hazards EXCEPT: a) Electrocution b) Earthquake c) Electric shock d) Fire 39) What would be the effect of 0.001 A of current flowing through the human body? a) It can cause a little pain. b) Muscles of hands can be paralyzed. c) It can lead to death. d) It can cause serious burns to body tissues. 40) A patient in an hospital had an electric current passed through his heart region for more than 2 seconds. It caused him an irregular heart muscle contraction and his blood is not properly pumped. What is the probable amount of current that flowed through his body? a) 0.001 A b) 0.01 A c) 0.1 A d) 1 A 41) An object becomes positively charged when__________. a) It loses electrons b) Protons are added to it c) Neutrons are removed from it d) The number of electrons is increase 42) It is a measure of the opposition to current flow in an electrical circuit. a) Resistance b) Voltage c) Battery d) Current 43) The electric potential difference is also known as: a) Resistance b) Voltage c) Battery d) Current 44) It is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. a) Resistance b) Voltage c) Battery d) Current 45) A component which provides resistance is called __________. a) Heat b) Energy c) Product d) Resistor 46) Insulators are substances which __________. a) Are usually made of cheap materials b) Are extremely slow in allowing a charge c) Actually block a charge from passing through d) Are extremely fast in allowing a charge to pass through 47) Ohmmeter measures _____. a) Length b) Material c) Resistance d) None of the above 48) Ohm’s law is not applicable to__________. a) DC circuits b) High currents c) Small resistors d) Semi-conductors 49) A diagram drawn using symbols which represents electrical components is called__________. a) Circuit diagram b) Current diagram c) Charges diagram d) Electric diagram 50) In a parallel circuit, the current flowing from source to each path is_________. a) Greater b) Lesser c) Equal d) Unequal 51) A resistance of 11 Ω will allow 10 A of current if the electromotive force is_________. a) 0.91 V b) 1.1 V c) 10 V d) 110 V 52) Which among the choices describes an ammeter? a) It is also a galvanometer. b) It measures electrical power. c) It is connected across a circuit. d) It measures the resistance in an electrical system. 53) Ohm’s law states that: a) I in a circuit is inversely proportional to emf b) I in a circuit is directly proportional to the emf c) Emf and resistance are inversely proportional d) I in a circuit is directly proportional to resistance 54) The electromotive force or emf is: a) Measured in volts b) Creates a difference in potential c) Gives the electrons a greater potential energy d) All of the above 55) Total resistance in the circuit? a) 1 Ω b) 2 Ω c) 3 Ω d) 4 Ω 56) Voltage drop in each appliance? a) 10 V b) 110 V c) 20 V d) 220 V 57) Current used by each appliance, in respective order? a) 11 A, 22 A, 44 A, 2.9 A, 4.0 A b) 11 A, 22 A, 33 A, 44 A, 55 A c) 11 A, 22 A, 44 A, 3.9 A, 5.0 A d) 21 A, 22 A, 44 A, 2,9 A, 5.0 A 58) Total current? a) 82 A b) 84 A c) 86 A d) 88 A 59) What is an instrument that directly measures electrical resistance? a) Ammeter b) Voltmeter c) Ohmmeter d) Diameter 60) These electrical circuits are practical circuits that are more complicated. A system with such a complex circuit is commonly described as a:  a) Network b) Parallel circuit c) Series circuit d) Ohm’s law

ELECTRONICS REVIEWER

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