MCQ Chapter 8 Class 7 Science Curiosity NCERT Advertisement Measurement of Time and Motion 1. What is the primary method used by ancient people to keep track of time?Using mechanical clocksObserving natural cycles like the Sun and MoonUsing quartz clocksMeasuring atomic vibrationsQuestion 1 of 202. Which device uses the shadow of an object to measure time?HourglassSundialWater clockCandle clockQuestion 2 of 203. How does a floating bowl-type water clock measure time?By measuring water flowing out of a vesselBy tracking sand flow between bulbsBy a bowl sinking after filling with waterBy burning a marked candleQuestion 3 of 204. What is the function of markings on a candle clock?To indicate the time as the candle burnsTo measure the length of the candleTo track water flowTo show sand levelsQuestion 4 of 205. What is the world’s largest stone sundial called?Ghatika-yantraSamrat YantraHuygens’ PendulumQuartz ClockQuestion 5 of 206. How often does the shadow of the Samrat Yantra move?1 cm per second1 mm per second2 mm per second2 cm per secondQuestion 6 of 207. In the simple water clock activity, what is used to make the water level visible?SandInk or colourOilSaltQuestion 7 of 208. What was the time unit measured by the Ghatika-yantra?SecondMinuteGhatiHourQuestion 8 of 209. Who invented the pendulum clock?Galileo GalileiChristiaan HuygensAryabhataVarahamihiraQuestion 9 of 2010. What inspired Huygens to invent the pendulum clock?Water clocksGalileo’s pendulum investigationsSundial designsAtomic vibrationsQuestion 10 of 2011. What is the bob in a simple pendulum?The threadThe rigid supportThe metallic ballThe stopwatchQuestion 11 of 2012. When is a pendulum said to have completed one oscillation?When it moves from mean position to one extreme positionWhen it moves from one extreme position to another and backWhen it remains at restWhen it swings only to one sideQuestion 12 of 2013. What is the time period of a pendulum?The time taken to move to one extreme positionThe time taken to complete one oscillationThe time taken to come to restThe time taken to swing to both extremesQuestion 13 of 2014. In Activity 8.2, how is the time period of a pendulum calculated?By multiplying the time for 10 oscillations by 10By dividing the time for 10 oscillations by 10By adding the time for 10 oscillationsBy measuring one oscillation directlyQuestion 14 of 2015. What factor affects the time period of a simple pendulum?The mass of the bobThe length of the stringThe colour of the bobThe type of threadQuestion 15 of 2016. What remains constant for pendulums of the same length at a given location?The mass of the bobThe time periodThe amplitude of oscillationThe speed of oscillationQuestion 16 of 2017. What is the SI unit of time?MinuteHourSecondGhatiQuestion 17 of 2018. How many seconds are in one minute?30601203600Question 18 of 2019. What is the smallest interval of time measurable by the wall clock in Fig.8.9?One minuteOne hourOne secondOne millisecondQuestion 19 of 2020. In sports, how precisely can timekeeping devices measure events?To one secondTo one-tenth of a secondTo one-thousandth of a secondTo one minuteQuestion 20 of 20 Loading...
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