Recent questions in Chapter 5: Heat

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4.A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg °C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg °C.

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A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained?

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Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C,

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Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3°C and B by 5°C. Which object has more specific heat? And by what factor?

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8. Read the following paragraph and answer the questions.

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d. On what basis and how will you determine whether air is saturated with vapour or not?

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c. Explain the role of latent heat in the change of state of a substances?

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b Which principle is used to measure the specific heat capacity of a substance?

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a. What is meant by latent heat? How will the state of matter transform if latent heat is given off?

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c. In cold regions in winter, the rocks crack due to anomalous expansion of water.

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b. How can you relate the formation of water droplets on the outer surface of a bottle taken out of refrigerator with formation of dew?

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a. What is the role of anomalous behaviour of water in preserving aquatic life in regions of cold climate?

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Explain the following temperature versus time graph.

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While deciding the unit for heat, which temperatures interval is chosen? Why?

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What is meant by specific heat capacity? How will you prove experimentally that different substances have different specific heat capacities?

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2. Observe the following graph. Considering the change in volume of water as its temperature is raised from 0 o C,

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1. Fill in the blanks and rewrite the sentence.

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