प्रश्न-3 स्वचालित वाहनों के पहिए खाँचेदार क्यों होते हैं?
Why are tyres of automobiles treaded ?
प्रश्न-4 द्विधातु पट्टी के कोई दो उपयोग लिखिए।
Write any two uses of Bimetallic strip.
2011212
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The tyres of vehicles have treads in them to increase the friction between the tyre and the road and to prevent skidding.
A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper, or in some cases steel and brass.
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3. taki wah fisle na aur taste ko pakade rhe
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