Heat and Energy Quiz - ICSE Class 9 Physics

Free practice quiz: Heat and Energy (ICSE Class 9 Physics). 47 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 9 Physics practice quiz has 47 multiple-choice questions on Heat and Energy, and 47 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. A block of ice at -10°C is heated. Which of the following processes will occur at a constant temperature?

   1. Increase in temperature of ice
   2. Melting of ice
   3. Increase in temperature of water
   4. Boiling of water
   Show answer

   Answer: B. Melting of ice

   When ice at -10°C is heated, its temperature will first increase until it reaches its melting point (0°C). At 0°C, the ice will start to melt into water. The melting process occurs at a constant temperature until all the ice has melted. After all ice has melted, the temperature of the water will then increase.

2. Which of the following phenomena demonstrates heat transfer by radiation?

   1. Feeling the warmth of a hot stove when you touch it.
   2. The circulation of water in a pot being heated from below.
   3. Feeling the warmth of the sun on your skin.
   4. The transfer of heat through a metal rod.
   Show answer

   Answer: C. Feeling the warmth of the sun on your skin.

   Heat transfer by radiation does not require a medium. The sun's heat reaches the Earth through the vacuum of space via electromagnetic waves, which is radiation. Touching a hot stove is conduction. Water circulation in a pot is convection. Heat transfer through a metal rod is conduction.

3. A bimetallic strip is made of two metals with different coefficients of thermal expansion. When heated, the strip bends. This is because:

   1. Both metals expand by the same amount.
   2. One metal expands more than the other.
   3. Both metals contract.
   4. The strip becomes magnetic.
   Show answer

   Answer: B. One metal expands more than the other.

   When a bimetallic strip is heated, the metal with the higher coefficient of thermal expansion will expand more than the metal with the lower coefficient. This differential expansion causes the strip to bend, with the more expansive metal on the outside of the curve.

4. When a substance undergoes a phase change from gas to liquid, it is called condensation. During condensation, the substance:

   1. Absorbs heat energy.
   2. Releases heat energy.
   3. Does not change temperature.
   4. Both absorbs heat and does not change temperature.
   Show answer

   Answer: B. Releases heat energy.

   Condensation is an exothermic process, meaning it releases energy. This released energy is the latent heat of vaporization. For example, when steam condenses into water, it releases latent heat.

5. When ice melts into water, its density:

   1. Increases.
   2. Decreases.
   3. Remains the same.
   4. First increases then decreases.
   Show answer

   Answer: A. Increases.

   The density of ice is approximately 920 kg/m³, while the density of liquid water at 0°C is approximately 1000 kg/m³. Therefore, when ice melts into water, its density increases.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Two identical metal spheres, one at 100°C and the other at 0°C, are brought into thermal contact. After some time, their temperatures become equal. This is an example of:
2. A substance has a specific heat capacity of 2000 J/kg°C. If 5 kg of this substance is heated from 20°C to 70°C, how much heat energy is absorbed by the substance?
3. The process by which heat is transferred through solids by direct contact of particles is called:
4. Which of the following statements about specific heat capacity is INCORRECT?
5. A container of water is heated from below. The primary mode of heat transfer in the water is:
6. What is the unit of specific latent heat of fusion?
7. When a gas is heated in a closed container, its temperature increases. This is because:
8. A metal block absorbs 1500 J of heat energy, and its temperature rises by 30°C. If the mass of the block is 0.5 kg, what is its specific heat capacity?
9. A substance is heated at a constant rate. Its temperature-time graph shows a horizontal line segment during a phase change. This indicates that:
10. If the coefficient of volume expansion of a liquid is $\gamma$ and its coefficient of linear expansion is $\alpha$, what is the relationship between $\gamma$ and $\alpha$?
11. A 2 kg block of metal at 100°C is placed on a 0.5 kg block of ice at 0°C. Assuming no heat loss to the surroundings and that all the ice melts, what will be the final temperature of the mixture?
12. Which of the following is a property of good thermal insulators?
13. A solid undergoes sublimation when heated. This means it changes directly from:
14. The SI unit of heat is:
15. A black body is a hypothetical object that:
16. When water boils, it changes from liquid to gas. This process requires energy input, known as:
17. Which of the following statements about heat transfer by convection is true?
18. The temperature at which a substance changes from a liquid to a solid is called its:
19. If 500 J of heat is added to a system, and the system does 200 J of work, what is the change in internal energy of the system?
20. The Celsius scale is based on the freezing point and boiling point of water at standard atmospheric pressure. What are these temperatures in Celsius?
21. When heat is transferred through the vacuum of space from the Sun to Earth, the primary mechanism is:
22. The specific latent heat of fusion for ice is approximately 334,000 J/kg. If 1 kg of ice at 0°C is completely melted into water at 0°C, how much heat energy is absorbed?
23. A thermometer measures temperature by:
24. Which of the following statements about thermal expansion is correct?
25. The heat capacity of an object is defined as:
26. A piece of copper is heated from 20°C to 120°C. If its initial length is 100 cm and its coefficient of linear expansion is $17 imes 10^{-6}$ °C$^{-1}$, what is the change in length?
27. Which of the following is a characteristic of heat transfer by radiation?
28. When a gas is expanded isothermally, its internal energy:
29. The process of heat transfer from the Sun to the Earth occurs mainly by:
30. Which of the following is NOT a unit of temperature?
31. A metal rod is heated at one end. Heat is transferred along the rod to the other end primarily by:
32. What happens to the internal energy of a substance when it boils at a constant temperature?
33. Which of the following describes the transfer of heat through electromagnetic waves?
34. A blacksmith heats a metal rod until it glows red. This glow is a manifestation of:
35. If the coefficient of volume expansion of a liquid is $4.5 imes 10^{-4}$ °C$^{-1}$, what is its approximate coefficient of linear expansion?
36. Which of the following is the most efficient way to transfer heat in a fluid?
37. A thermometer registers a temperature of 20°C. This means:
38. When steam at 100°C condenses into water at 100°C, the energy change involved is due to:
39. The heat energy required to increase the temperature of a unit mass of a substance by one degree Celsius is known as:
40. When a solid melts, its temperature:
41. Which of the following is the most effective radiator of heat?
42. The ideal gas law relates pressure (P), volume (V), temperature (T), and the number of moles (n). It is expressed as PV = nRT, where R is the ideal gas constant. If a gas is heated at constant volume, what happens to its pressure?

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