Thermal Insulation | MCQs
لوگ موسم گرما میں سفید کپڑے پہننے کا حوالہ دیتے ہیں کیونکہ؟
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A. Absorb heat
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B. None of these
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C. Donot absorb heat
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D. The clothes look nice and cool
Explanation
White clothes reflect most of the sunlight, which helps keep the body cooler compared to darker clothes, which absorb more heat.
موصلی مواد ____________ فطرت میں ہوتے ہیں۔
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A. All of these
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B. Polarizing
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C. Dielectric
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D. Semiconductor
Explanation
dielectric, insulating material, or a very poor conductor of electric current.
When dielectrics are placed in an electric field, practically no current flows in them because, unlike metals
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A. Because ice being cannot be lifted with bare hands
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B. To prevent the dust from collecting on the ice
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C. None of these
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D. To provide necessary insulation from heat
Explanation
Ice blocks are covered with sawdust primarily to provide necessary insulation from heat, preventing them from melting quickly.
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A. None of these
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B. Glass
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C. A porcelain sheet
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D. An asbestos sheet
Explanation
Those substances through which electric current cannot pass are called insulators.
Insulators have very high electrical resistance
. For example, wood, rubber, glass, paper, plastic and wax are insulators of electricity.
Insulators cannot conduct electricity due to absence of free electrons in them.
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