Critical Thinking Questions: Calorimetry

Type I

Assertion & Reason Based Questions

Q1: Assertion: The amount of heat energy required to raise the temperature of 1 g of water by 1°C is the same as the amount required to raise the temperature of 1 kg of copper by 1°C.
Reason: The specific heat capacity of a substance indicates the amount of heat energy needed to raise the temperature of a unit mass of the substance by 1°C.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q2: Assertion: The S.I. unit of heat is joule, which is equivalent to the amount of heat required to raise the temperature of 1 g of water by 1°C.
Reason: One calorie is defined as the amount of heat energy required to raise the temperature of 1 g of water from 14.5°C to 15.5°C.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) Both the assertion and the reason are true, but the reason is not a correct explanation of the assertion. 
(c) The assertion is true, but the reason is false. 
(d) The assertion is false, but the reason is true.

Q3: Assertion: The heat capacity of an object is directly proportional to its mass and the specific heat capacity of the material it is made of.
Reason: Objects with equal mass made from different substances absorb different amounts of heat energy to raise their temperature by the same amount.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q4: Assertion: When equal masses of copper and water are heated by the same amount, copper will reach a higher temperature than water.
Reason: Copper has a lower specific heat capacity than water, meaning it requires less heat energy to raise its temperature by 1°C.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q5: Assertion: Water has a higher specific heat capacity than sand, which contributes to the moderate climate near the seaside.
Reason: The high specific heat capacity of water allows it to absorb more heat without a significant rise in temperature, which influences the local climate by mitigating temperature extremes.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q6: Assertion: The melting point of ice decreases with an increase in pressure.
Reason: Increased pressure disrupts the crystal lattice of ice, making it easier for the molecules to move past one another and transition into a liquid state.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q7: Assertion: The base of cooking utensils, like pans and electric presses, is often made thick to utilise the property of low heat capacity.
Reason: A thicker base in cooking utensils slows down the transfer of heat to the food, allowing for more even cooking and temperature maintenance.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) Both the assertion and the reason are true, but the reason is not a correct explanation of the assertion. 
(c) The assertion is true, but the reason is false. 
(d) The assertion is false, but the reason is true.

Q8: Assertion: At high altitudes, water boils at temperatures lower than 100°C.
Reason: The atmospheric pressure is lower at high altitudes, which decreases the boiling point of water.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q9: Assertion: The specific latent heat of fusion of ice is the amount of heat required to convert unit mass of ice at 0°C to water at 0°C without any change in temperature.
Reason: During the phase change, the energy supplied is used to overcome the intermolecular forces between water molecules instead of increasing the temperature.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) The assertion is true, but the reason is false. 
(c) The assertion is false, but the reason is true. 
(d) Both the assertion and the reason are false.

Q10: Assertion: The melting point of a substance increases with the addition of impurities.
Reason: Impurities disrupt the regular lattice structure of a solid, thereby requiring more energy to break intermolecular bonds.
(a) Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. 
(b) Both the assertion and the reason are true, but the reason is not a correct explanation of the assertion. 
(c) The assertion is true, but the reason is false. 
(d) The assertion is false, but the reason is true.

Type II

Statements Based Questions

Q11: Statement 1: Heat is a form of energy that flows from a hotter body to a colder body. 
Statement 2: The SI unit of heat is joule (J). 
Statement 3: One calorie is defined as the heat energy required to raise the temperature of 1g of water from 14.5°C to 15.5°C.
(a) Only 1 
(b) Only 2 
(c) Only 1 and 3 
(d) All 1, 2, and 3

Q12: Statement 1: The specific heat capacity is a characteristic property of a substance. 
Statement 2: Copper has a higher specific heat capacity than water. 
Statement 3: Specific heat capacity is measured in units of J/kg K.
(a) Only 1 
(b) Only 1 and 3 
(c) Only 2 and 3 
(d) All 1, 2, and 3

Q13: Statement 1: Temperature is a measure of the average kinetic energy of particles in a substance. 
Statement 2: The zero on the Kelvin scale represents the point at which molecular motion ceases. 
Statement 3: Temperature is measured in Celsius and Kelvin, where 0°C equals 273 K.
(a) Only 1 and 2 
(b) Only 2 and 3 
(c) Only 1 and 3 
(d) All 1, 2, and 3

Q14: Statement 1: Heat capacity is the amount of heat energy required to raise the temperature of an entire body by 1°C. 
Statement 2: Heat capacity depends on the mass of the body and the nature of the substance. 
Statement 3: The unit of heat capacity is JK⁻¹.
(a) Only 1 and 2 
(b) Only 3 
(c) Only 1 and 3 
(d) All 1, 2, and 3

Q15: Statement 1: The principle of calorimetry is based on the law of conservation of energy. 
Statement 2: In calorimetry, the heat lost by a hot object equals the heat gained by a cold object. 
Statement 3: Calorimeters are typically made of materials with high specific heat capacities.
(a) Only 1 and 2 
(b) Only 2 and 3 
(c) Only 1 
(d) All 1, 2, and 3

Q16: Statement 1: Latent heat is the heat involved in changing the state of a substance without a change in temperature. 
Statement 2: The latent heat of fusion refers to the heat required to change a substance from solid to liquid. 
Statement 3: The SI unit of latent heat is Joule per kilogram.
(a) Only 2 
(b) Only 1 and 3 
(c) Only 1 and 2 
(d) All 1, 2, and 3

Q17: Statement 1: The specific heat capacity of copper is 0.385 J/g°C. 
Statement 2: The final temperature of the mixture does not depend on the masses or the specific heat capacities of the copper and water. 
Statement 3: The specific heat capacity of water is 4.18 J/g°C.
(a) Only 1 and 3 
(b) Only 2 
(c) Only 1 and 2 
(d) All 1, 2, and 3

Q18: Statement 1: The thermal capacity of a body is defined as the amount of heat required to raise its temperature by 1 K. 
Statement 2: Specific heat capacity and thermal capacity are directly proportional. 
Statement 3: The higher the specific heat capacity, the more heat is required to raise the temperature.
(a) Only 1 and 3 
(b) Only 1 and 2 
(c) Only 2 and 3 
(d) All 1, 2, and 3

Q19: Statement 1: The heat required to raise the temperature of 2 kg of water from 10°C to 50°C is 336,000 J. 
Statement 2: The specific heat capacity of water is 4200 J/kg K. 
Statement 3: The formula used for this calculation is Q = mc ΔT.
(a) Only 2 and 3 
(b) Only 1 and 3 
(c) Only 1 
(d) All 1, 2, and 3

Q20: Statement 1: If 5000 Joules of heat is required to raise the temperature of an iron ball by 10°C, its heat capacity is 500 J/K. 
Statement 2: The specific heat capacity of the iron ball is 450 J/kg K if its mass is 11 kg and total heat capacity is 495 J. 
Statement 3: The heat capacity of an object is calculated using the formula C = Q/ΔT.
(a) Only 1 and 3 
(b) Only 2 
(c) Only 1 and 2 
(d) All 1, 2, and 3