MCQ Chapter 3 Class 7 Science Curiosity NCERT Advertisement Electricity: Circuits and their Components 1. Why does a lamp not glow if an insulator is connected between its terminals?Insulators increase current flowInsulators block current flowInsulators generate heatInsulators store energyQuestion 1 of 202. In the document, what is used to connect the positive terminal of one cell to the negative terminal of another in a battery?Plastic stripThick wire or metal stripGlass rodRubber bandPLANATION HawkinsQuestion 2 of 203. What type of energy source is used at the Bhakra Nangal Dam to generate electricity?Wind energySolar energyFalling waterNatural gasQuestion 3 of 204. Which of the following is a use of electricity under the 'Cooking' category?TelevisionElectric kettleWater pumpMobile phoneQuestion 4 of 205. What happens to the lamp in a circuit if the switch is in the 'OFF' position?The lamp glows dimlyThe lamp does not glowThe lamp glows brightlyThe lamp flickersQuestion 5 of 206. Which component in a torchlight is responsible for controlling the flow of electricity?BatteryLampSwitchWireQuestion 6 of 207. What is the role of the filament in an incandescent lamp?It conducts electricity without glowingIt gets hot and glows to produce lightIt insulates the lampIt stores electrical energyQuestion 7 of 208. Why is silver not commonly used for electrical wires despite being a good conductor?It is too heavyIt is less conductive than copperIt is more expensiveIt is an insulatorQuestion 8 of 209. What is the purpose of the metal case in an incandescent lamp?To act as one of the terminalsTo insulate the filamentTo store electricityTo cool the lampQuestion 9 of 2010. What should you use for safe experiments with electricity, according to the document?Wall socket powerPortable generatorsBatteries or cellsSolar panelsQuestion 10 of 2011. In a battery, how are the cells typically arranged to make a lamp glow?Positive to positive terminalNegative to negative terminalPositive to negative terminalRandomlyQuestion 11 of 2012. What does the triangle in the LED symbol indicate?The direction of light emissionThe direction of current flowThe positive terminalThe filament positionQuestion 12 of 2013. What is the result if the wires in a circuit are not stripped of their plastic covering?The lamp will glow brighterThe circuit will remain openThe current will increaseThe battery will overheatQuestion 13 of 2014. Which of the following is a conductor of electricity?RubberGlassMetal keyWooden blockQuestion 14 of 2015. What happens if you reverse the connections of an LED in a circuit?The LED glows brighterThe LED does not glowThe LED changes colorThe LED uses less powerQuestion 15 of 2016. What is the primary purpose of insulators in electrical devices?To increase current flowTo protect from electric shocksTo generate electricityTo store energyQuestion 16 of 2017. Why does a lamp not glow in some circuit arrangements?The circuit is completeThe circuit is openThe battery is overchargedThe lamp is too brightQuestion 17 of 2018. What type of cell is used in watches, according to the document?Cylindrical batteryButton cellRechargeable batterySolar cellQuestion 18 of 2019. What is the benefit of using standard symbols for electrical components?They reduce the cost of circuitsThey make circuits more efficientThey help global understandingThey increase conductivityQuestion 19 of 2020. What should you do if you cannot read the '+' and '–' symbols on a battery?Use it randomlyTest it with a conduction testerConnect it to a lamp and observeDiscard the batteryQuestion 20 of 20 Loading...
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