Thermal Properties of Matter quiz

The temperature at which the Celsius and Fahrenheit readings are equal is:

The SI unit of thermal conductivity is:

Water has its maximum density at:

During melting at constant pressure, the temperature of a substance:

The coefficient of volume expansion of an isotropic solid is about:

Heat transfer through a vacuum takes place by:

The specific heat of water is:

The latent heat of vaporisation of water is about:

The triple point of water is:

Which surface absorbs heat radiation best?

Why are gaps left between railway rails? (2 marks)

Explain the anomalous expansion of water and its importance for aquatic life. (2 marks)

What is meant by latent heat of fusion? (2 marks)

Why are cooking pots made with copper bottoms and wooden handles? (2 marks)

Explain sublimation with an example. (2 marks)

Why is water used as a coolant in car radiators? (2 marks)

What is the principle of calorimetry? (2 marks)

Explain why a thermos flask keeps liquids hot or cold. (2 marks)

What is the absolute zero of temperature? (2 marks)

Why do we prefer light-coloured clothes in summer? (2 marks)

A body cools from 80 to 50 degrees Celsius in 5 minutes in a room at 20 degrees Celsius. Find the time it takes to cool from 60 to 30 degrees Celsius. (3 marks)

A brass disc has a hole of diameter 4.24 cm at 27 degrees Celsius. Find the change in diameter of the hole when the disc is heated to 227 degrees Celsius. Take alpha = 1.9 x 10^-5 per K. (3 marks)

How much heat is needed to melt 0.5 kg of ice at 0 degrees Celsius? Take L = 3.35 x 10^5 J/kg. (3 marks)

Convert 300 K into degrees Celsius and degrees Fahrenheit. (3 marks)

A copper rod 1 m long with a cross-section of 10^-4 m^2 has its ends at 100 and 0 degrees Celsius. Find the heat flow per second. Take K = 385 W/m K. (3 marks)

Read the passage and answer the questions. A railway engineer lays steel rails 10 m long at 20 degrees Celsius. In summer the rails can reach 60 degrees Celsius. Take alpha = 1.2 x 10^-5 per K. (i) Find the increase in length of each rail. (ii) What gap should be left between rails? (iii) What could happen if no gaps were left? (5 marks)

Read the passage and answer the questions. A cup of tea at 90 degrees Celsius is left in a room at 25 degrees Celsius. (i) Which law describes its cooling? (ii) Does the tea cool faster at 90 or at 50 degrees Celsius? Why? (iii) Name two ways in which it loses heat. (5 marks)

Read the passage and answer the questions. A pressure cooker raises the pressure inside it above atmospheric pressure. (i) What happens to the boiling point of water inside? (ii) Why does food cook faster? (iii) Why does water boil at a lower temperature on a mountain? (5 marks)

Read the passage and answer the questions. During the day, land heats up faster than the sea. (i) Which has the higher specific heat, land or water? (ii) In which direction does the breeze blow during the day? (iii) Name the mode of heat transfer involved. (5 marks)

Read the passage and answer the questions. A student heats 0.5 kg of ice at -10 degrees Celsius until it becomes water at 20 degrees Celsius. Take c_ice = 2100 J/kg K and L = 3.35 x 10^5 J/kg. (i) Find the heat needed to warm the ice to 0 degrees Celsius. (ii) Find the heat needed to melt it. (iii) Find the heat needed to warm the water to 20 degrees Celsius and the total heat. (5 marks)

Explain the different temperature scales and derive the relation between the Celsius and Fahrenheit scales. (6 marks)

Explain linear, area and volume expansion. Derive the relation between their coefficients and explain the anomalous expansion of water. (6 marks)

Explain specific heat capacity and calorimetry. Describe how the specific heat of a solid is found by the method of mixtures. (6 marks)

Explain the change of state of matter, latent heat, and the effect of pressure on melting and boiling points. (6 marks)

State Newton's law of cooling. Describe an experiment to verify it and draw the expected cooling curve. (6 marks)