MCQ Science and Technology Class 9 Chapter 18 Maharashtra Board Observing Space : Telescopes 1. What has man been curious about since early days?The oceanThe sun, moon, and starsThe forestsThe mountainsQuestion 1 of 202. Why did man begin sky watching?For entertainmentFor navigation and agricultureFor building sheltersFor huntingQuestion 2 of 203. What did early man lack for closer views of stars and planets?KnowledgeEquipmentTimeInterestQuestion 3 of 204. Who made the first telescope in 1608?Galileo GalileiIsaac NewtonSubramanian ChandrashekharHans LippersheyQuestion 4 of 205. What did Galileo use his telescope for in 1609?NavigationAgricultureSpace observationsWeather predictionQuestion 5 of 206. What did Galileo discover using his telescope?Black holesEarth’s rotationMoons of JupiterCometsQuestion 6 of 207. What is light described as in the document?A sound waveA particleA mechanical waveAn electromagnetic waveQuestion 7 of 208. What is the wavelength range of visible light?200 nm to 400 nm800 nm to 1200 nm400 nm to 800 nm100 nm to 200 nmQuestion 8 of 209. Why can’t humans see most electromagnetic waves?They are too brightThey are absorbed by skinEyes are not sensitive to themThey are too fastQuestion 9 of 2010. What type of telescope is used to observe visible radiation?Radio telescopeX-ray telescopeGamma-ray telescopeOptical telescopeQuestion 10 of 2011. What do heavenly bodies emit besides visible light?Only radio wavesOnly ultraviolet raysX-rays, gamma rays, and radio wavesOnly infrared raysQuestion 11 of 2012. What is the main component of an optical telescope?Mirrors onlyA single lensTwo or more lensesA parabolic dishQuestion 12 of 2013. What is the role of the objective lens in an optical telescope?To produce a large imageTo reflect lightTo reduce image sizeTo collect maximum lightQuestion 13 of 2014. What produces a large image in an optical telescope?EyepieceObjective lensConcave mirrorPlane mirrorQuestion 14 of 2015. What causes light rays to change direction in a refracting telescope?ReflectionDiffractionRefractionAbsorptionQuestion 15 of 2016. Why is it difficult to make very large lenses for refracting telescopes?They are too lightThey get distortedThey are too cheapThey are too smallQuestion 16 of 2017. What is a disadvantage of refracting telescopes?Small sizeChromatic aberrationLightweight lensesEasy to manageQuestion 17 of 2018. What type of telescope uses concave mirrors?Refracting telescopeRadio telescopeReflecting telescopeX-ray telescopeQuestion 18 of 2019. Why are large mirrors preferred in reflecting telescopes?They are harder to makeThey collect more lightThey cause color errorsThey are heavierQuestion 19 of 2020. What is an advantage of mirrors over lenses in telescopes?Mirrors are heavierMirrors are easier to make largeMirrors have color errorsMirrors are more expensiveQuestion 20 of 20 Loading...
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