Science Practice Quiz 159

Q1.Based on the principles of heat transfer discussed, why are people advised to use an umbrella when out in the sun?

A. To increase the absorption of sunlight B. To block direct contact with air C. To reflect a part of the sun's heat D. To enhance the transmission of heat to the body

Q2.How can buildings be constructed to be less affected by external heat and cold?

A. By using hollow bricks in outer walls. B. By painting outer walls with dark colours. C. By installing large glass windows. D. By constructing walls with a single, thick layer of concrete.

Q3.Why are light-coloured clothes preferred in summer, as per the provided information?

A. They absorb more heat, keeping the body warm. B. They reflect most of the heat that falls on them. C. They allow more air circulation. D. They are generally made of lighter fabrics.

Q4.What is the primary reason for wearing dark-coloured clothes in winter?

A. They reflect heat, preventing heat loss. B. They absorb more heat from the surroundings. C. They are typically thicker than light-coloured clothes. D. They are less prone to getting dirty.

Q5.In woollen clothes, what is the role of air trapped between the fibres in keeping us warm?

A. It acts as a good conductor, transferring heat to the body. B. It prevents the flow of heat from our body to the cold surroundings. C. It increases the weight of the clothing, providing pressure. D. It absorbs moisture, keeping the body dry.

Q6.Which property of wool contributes to its ability to keep us warm in winter?

A. Wool is a good conductor of heat. B. Wool is a poor conductor of heat. C. Wool is highly reflective of light. D. Wool generates its own heat.

Q7.If given a choice in winter between one thick blanket or two thin blankets joined together, which option would likely provide more warmth and why, according to the principle mentioned in the text?

A. One thick blanket, as it has more material. B. Two thin blankets, because the trapped air layer between them acts as an insulator. C. One thick blanket, as it is heavier and provides more warmth. D. Two thin blankets, as they are lighter and allow more body heat to escape.

Q8.Based on the context provided about wool, which of the following best describes an 'Insulator'?

A. A material that allows heat to flow easily through it. B. A material that is a poor conductor of heat. C. A material that reflects all light. D. A material that generates heat.

Q9.What is the scientific measure of the degree of hotness of an object?

A. Heat capacity B. Thermal energy C. Temperature D. Specific heat

Q10.Which device is specifically used for measuring temperature?

A. Barometer B. Hydrometer C. Thermometer D. Anemometer

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Science Practice Quiz 159