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15 questions
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- Q11. Which of these common temperature scales does not have negative values?CelsiusFahrenheitKelvinRéaumur30sSC7.E.1
- Q22. What is the process called when heat is transferred through the movement of fluids like liquids or gases?RadiationConvectionConductionInsulation30s
- Q33. Why does a metal spoon left in a hot cup of tea also become hot to the touch?The spoon absorbs cold from the surrounding air.The spoon radiates heat towards the tea.Convection currents in the tea warm the spoon.Heat is conducted from the tea to the spoon.30s
- Q44. What is the key difference between specific heat capacity and specific latent heat?Specific heat capacity relates to temperature change, while specific latent heat relates to state change.Specific heat capacity is a property of mixtures, while specific latent heat is a property of pure substances.Specific heat capacity applies only to solids, while specific latent heat applies to liquids and gases.Specific heat capacity is measured in calories, while specific latent heat is measured in joules.30s
- Q55. You are provided with two identical containers: one black and rough, the other white and shiny. You fill them with boiling water. Which container will cool down faster, and why?The black, rough container will cool faster because darker, rougher surfaces are better emitters of radiation.The black, rough container will cool faster because it absorbs more heat from the surroundings.The white, shiny container will cool faster because lighter, smoother surfaces are better conductors of heat.Both containers will cool at the same rate because the material of the container does not affect cooling.30s
- Q66. When you touch a wooden table and a metal chair in the same room, the metal chair feels colder. Why is this, even though both are at the same room temperature?Wood is a better insulator of heat than metal.Wood radiates more heat than metal.Metal naturally attracts and holds more coldness.Your hand is more sensitive to the texture of metal.30s
- Q77. Why is water used as a coolant in car engines?Water has a high specific heat capacity, allowing it to absorb a large amount of heat without a significant temperature rise.Water is readily available and inexpensive.Water evaporates easily, taking heat away from the engine.Water is a good conductor of heat, transferring heat quickly away from the engine.30s
- Q88. Double-glazed windows are designed with a layer of air trapped between two panes of glass. How does this help to insulate a building?The air layer absorbs heat and prevents it from entering or escaping.The air layer prevents heat transfer by conduction.The air layer reflects heat back into the building.The air layer creates a vacuum, stopping all heat transfer.30s
- Q99. Why do coastal areas often experience milder temperatures than inland areas? Consider the properties of water and land in your explanation.Sea breezes constantly bring cool air from the ocean.Coastal areas are generally at lower altitudes, which are known to have milder temperatures.Water has a higher specific heat capacity than land, so it heats up and cools down more slowly, moderating coastal temperatures.Inland areas have more vegetation, which absorbs heat and makes the temperatures higher.30s
- Q1010. Land breezes and sea breezes are examples of convection currents. Explain how these breezes form, and why they change direction between day and night.During the day, the sea is warmer than the land, causing warm air to rise over the sea and draw in cool air from the land, creating a sea breeze. At night, the land cools down faster, and the cycle reverses.Land breezes and sea breezes are caused by differences in air pressure, unrelated to temperature differences between land and sea.During the day, land heats up faster than water, creating a low-pressure area over land. Cooler air from the sea flows towards the land, forming a sea breeze. At night, the process reverses, with the land cooling faster, leading to a land breeze.Land breezes and sea breezes are driven by the rotation of the Earth and not by temperature differences.30s
- Q1111. Convert 30°C to Fahrenheit. Use the formula: °F = (°C × 9/5) + 32112°F54°F86°F140°F30s
- Q1212. A 200g piece of metal with a specific heat capacity of 0.5 J/g°C is heated from 20°C to 50°C. Calculate the amount of heat energy absorbed by the metal. Use the formula: Q = mcΔT, where Q is heat energy, m is mass, c is specific heat capacity, and ΔT is the change in temperature.1000 J7000 J5000 J3000 J30s
- Q1313. You have 50g of ice at 0°C. Calculate the amount of heat energy required to completely melt the ice into water at 0°C. The latent heat of fusion of ice is 334 J/g. Use the formula: Q = mL, where Q is heat energy, m is mass, and L is the latent heat of fusion.8350 J33400 J66800 J16700 J30s
- Q1414. A 150g block of ice at -10°C is heated until it completely transforms into steam at 100°C. Calculate the total heat energy required for this process.566,100 J679,650 J339,000 J452,550 J30s
- Q1515. 100g of metal at 80°C is dropped into a calorimeter containing 200g of water at 20°C. The final temperature of the mixture is 25°C. Calculate the specific heat capacity of the metal. The specific heat capacity of water is 4.2 J/g°C.1.36 J/g°C0.34 J/g°C0.68 J/g°C1.02 J/g°C30s