Q. A 500 g block of ice at -10°C is heated until it melts completely and the water is at 0°C. How much heat is required? (Specific heat of ice = 2.1 J/g°C, Latent heat of fusion = 334 J/g) (2000)
A.
1050 J
B.
1340 J
C.
1500 J
D.
2000 J
Solution
Heat to raise ice to 0°C = 500g * 2.1 J/g°C * 10°C = 10500 J. Heat to melt = 500g * 334 J/g = 167000 J. Total = 1050 J + 167000 J = 1340 J.
Q. A metal block of mass 2 kg at 100°C is placed in 1 kg of water at 20°C. What is the final temperature of the system? (Specific heat of water = 4.2 J/g°C, Specific heat of metal = 0.9 J/g°C)
A.
30°C
B.
40°C
C.
50°C
D.
60°C
Solution
Using conservation of energy: m1*c1*(T1-Tf) = m2*c2*(Tf-T2). Solving gives Tf = 50°C.
Q. If 200 g of ice at 0°C is added to 100 g of water at 80°C, what will be the final temperature of the mixture? (Latent heat of fusion of ice = 334 J/g)
A.
0°C
B.
20°C
C.
40°C
D.
60°C
Solution
Heat lost by water = Heat gained by ice. 100g * 80°C = 200g * 334 J/g + 200g * (Tf - 0°C). Solving gives Tf = 20°C.
Understanding the concepts of heat and temperature is crucial for students preparing for exams. This topic not only forms a significant part of the curriculum but also appears frequently in objective questions and MCQs. By practicing heat and temperature MCQ questions, students can enhance their grasp of the subject and improve their exam scores. Engaging with practice questions helps in reinforcing key concepts and identifying important questions that are likely to appear in exams.
What You Will Practise Here
Definitions of heat and temperature
Units of measurement for heat and temperature
Specific heat capacity and its applications
Thermal expansion and its effects
Heat transfer methods: conduction, convection, and radiation
Phase changes and latent heat
Key formulas related to heat and temperature calculations
Exam Relevance
The topic of heat and temperature is vital in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of fundamental concepts, as well as their ability to apply these concepts to solve numerical problems. Common question patterns include direct application of formulas, conceptual MCQs, and scenario-based questions that require critical thinking.
Common Mistakes Students Make
Confusing heat with temperature, leading to incorrect answers in conceptual questions.
Misapplying formulas related to specific heat capacity and latent heat.
Overlooking the units of measurement, which can result in calculation errors.
Neglecting the significance of thermal expansion in real-world applications.
Failing to understand the different methods of heat transfer and their implications.
FAQs
Question: What is the difference between heat and temperature? Answer: Heat is the energy transferred between objects due to a temperature difference, while temperature is a measure of the average kinetic energy of the particles in a substance.
Question: How can I calculate the specific heat capacity of a substance? Answer: Specific heat capacity can be calculated using the formula: \( c = \frac{Q}{m \Delta T} \), where \( Q \) is the heat added, \( m \) is the mass, and \( \Delta T \) is the change in temperature.
Now is the perfect time to enhance your understanding of heat and temperature. Dive into our practice MCQs and test your knowledge to excel in your exams!
Soulshift Feedback×
On a scale of 0–10, how likely are you to recommend
The Soulshift Academy?
