Electricity, Light and Sound MCQs – Page 2

Solved Everyday Science MCQs on electricity (conductors, fuses, AC, transformers, kWh), light (refraction, scattering, optical fibre) and sound (echo, ultrasound).

1. 21

   Bats find their way in the dark using:

   AMagnetic senseBSmell onlyCEcholocationDInfrared vision

   Correct answer: C. Echolocation

   Bats emit high-pitched sounds and listen for the echoes to locate objects and prey.

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2. 22

   SONAR, used by ships to detect underwater objects, works using:

   ARadio wavesBSound wavesCLight wavesDX-rays

   Correct answer: B. Sound waves

   SONAR (Sound Navigation and Ranging) sends out sound pulses and measures the time their echoes take to return.

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3. 23

   Sound generally travels fastest through:

   AAirBWaterCSteelDA vacuum

   Correct answer: C. Steel

   Sound travels fastest in solids such as steel, slower in liquids and slowest in gases. It cannot travel through a vacuum.

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4. 24

   Benjamin Franklin's famous kite experiment showed that lightning is a form of:

   ASoundBHeatCMagnetismDElectricity

   Correct answer: D. Electricity

   Franklin's 1752 experiment suggested that lightning is electrical, which led to his invention of the lightning rod.

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