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Class 11  »  Physics  »  Thermal Properties of Matter

Temperature and Heat - UNSOLVED PRACTICE SET

Class 11

Chapter: Thermal Properties of Matter | Topic: Temperature and Heat

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Class 11

TEMPERATURE AND HEAT - UNSOLVED PRACTICE SET

Topic: Temperature and Heat

Time: 40 mins | Marks: 30 | Difficulty: Medium

Multiple Choice Questions

Q1. Heat is defined as:

  1. The total kinetic energy of molecules in a body
  2. Energy in transit due to temperature difference
  3. The property that determines the direction of flow of energy
  4. Both (b) and (c)

Q2. Temperature is a measure of:

  1. The total heat content of a body
  2. The average kinetic energy of molecules
  3. The total mass of a body
  4. The potential energy of molecules

Q3. The SI unit of heat is:

  1. Calorie
  2. Joule
  3. Kelvin
  4. Watt

Q4. Two bodies at different temperatures are brought into thermal contact. Heat flows:

  1. From the body with more heat to the body with less heat
  2. From the body at higher temperature to the body at lower temperature
  3. From the heavier body to the lighter body
  4. In both directions equally

Q5. The absolute zero temperature on the Kelvin scale is:

  1. 0 K
  2. −273.15°C
  3. Both (a) and (b)
  4. Neither (a) nor (b)

Q6. The triple point of water is defined as:

  1. The temperature at which ice, water, and water vapour coexist in equilibrium
  2. 273.16 K
  3. A standard fixed point for thermometry
  4. All of the above

Short Answer Questions

Q7. Distinguish between heat and temperature. Why is heat not a property of a body while temperature is?

Q8. Define the triple point of water. Why is it preferred as a standard fixed point over the melting point of ice?

Q9. Convert 300 K to Celsius and Fahrenheit scales.

Q10. In your school laboratory, a student touches a metal rod and a wooden rod kept in the same room. The metal rod feels colder. Does this mean the metal rod is at a lower temperature? Explain.

Q11. What is thermal equilibrium? State the zeroth law of thermodynamics and explain its significance in temperature measurement.

Q12. Why does a clinical thermometer have a constriction near the bulb?

Long Answer Questions

Q13. Explain the concepts of heat and temperature in detail. Discuss:

(i) The molecular interpretation of temperature

(ii) Heat as energy in transit

(iii) The zeroth law of thermodynamics and its role in defining temperature

(iv) Why temperature is an intensive property while heat is not

(v) The relationship between heat, work, and internal energy

Q14. The triple point of neon is 24.57 K and that of carbon dioxide is 216.55 K.

(a) Convert these temperatures to the Celsius scale.

(b) Convert these temperatures to the Fahrenheit scale.

(c) Explain why the triple point is preferred as a standard fixed point.

(d) What is the significance of the triple point in defining the Kelvin scale?

(e) Why is the melting point of ice not as reliable as the triple point?

Q15. Analyse the following situations:

(i) A large bucket of water at 30°C and a small cup of water at 30°C

(ii) A hot iron ball dropped into cold water

(iii) Two bodies at the same temperature brought into contact

For each case, discuss:

(a) The direction of heat flow (if any)

(b) Whether thermal equilibrium is established

(c) The final state of the system

Application-Based Problems

Q16. A faulty thermometer reads 5°C at the ice point and 95°C at the steam point.

(a) Derive the correction formula to convert readings on this thermometer to the Celsius scale.

(b) What is the actual temperature when this thermometer reads 50°C?

(c) At what temperature will this thermometer give the correct reading?

(d) What will this thermometer read at absolute zero?

(e) Discuss why standard thermometers need calibration against fixed points.

Q17. In a school experiment, students measure the temperature of hot water cooling in a room.

(a) The water cools from 80°C to 70°C in 5 minutes. Calculate the average rate of cooling.

(b) If the room temperature is 25°C, calculate the average temperature difference during this interval.

(c) Predict the time to cool from 70°C to 60°C using Newton's law of cooling (qualitative discussion only).

(d) Design a simple experiment to verify that heat flows from hot to cold.

(e) List three precautions to ensure accurate temperature measurement.

Q18. A platinum resistance thermometer has resistance 4.0 Ω at the ice point, 5.46 Ω at the steam point, and 10.0 Ω in a hot bath.

(a) Calculate the temperature of the hot bath on the platinum scale.

(b) Calculate the temperature of the hot bath on the Celsius scale (assuming linearity).

(c) Why might the platinum scale differ slightly from the Celsius scale?

(d) Discuss the advantages of resistance thermometers over liquid-in-glass thermometers.

(e) At what resistance would this thermometer read 50°C?


Total: 30 Marks | Time: 40 mins

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