Question : Ice is packed in sawdust because
Option 1: sawdust will not get melted easily
Option 2: sawdust is a poor conductor of heat
Option 3: sawdust is a good conductor of heat
Option 4: sawdust does not stick to the ice
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Correct Answer: sawdust is a poor conductor of heat
Solution : The correct answer is sawdust is a poor conductor of heat.
Heat conducts poorly through the sawdust. Heat is insulated by the air that is present in sawdust's tiny pores. This air prevents heat from the environment from reaching the ice, preventing the melting of the ice. Sawdust is used to pack ice because it slows the melting process. Air and wood shavings combine to form sawdust. Both wood and air are poor heat conductors.
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Question : What do you call a component of identical size that offers a higher resistance to electricity?
Option 1: Poor conductor
Option 2: Semiconductor
Option 3: Good conductor
Option 4: Very good conductor
Question : Water is used in a hot water bag because:
Option 1: it is easily available
Option 2: it has high specific gravity
Option 3: it has high specific heat
Option 4: it is a liquid substance
Question : Which one of the following is a good electrical conductor?
Option 1: Graphite
Option 2: Diamond
Option 3: peat
Option 4: charcoal
Question : Which of the following is not a conductor?
Option 1: Hard rubber
Option 2: Copper
Option 3: Silver
Option 4: Nickel
Question : Fabric made from ____ does not get wrinkled easily.
Option 1: cotton
Option 2: flax
Option 3: silk
Option 4: polyester
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