Neco Model Questions Vol1 2019 Physics Question 48

Practice objective / multiple choice question 48 from the 2019 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2019 Physics Objective / Multiple Choice Medium Difficulty
Question 48 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

200 g of water at \(80^{\circ}\text{C}\) is mixed with 150 g of oil (specific heat \(c_{\text{oil}} = 2.0\ \text{J\,g}^{-1}\!^{\circ}\text{C}^{-1}\)) initially at \(20^{\circ}\text{C}\). The mixture is placed in a calorimeter whose heat capacity is \(50\ \text{J\,}^{\circ}\text{C}^{-1}\). (a) Assuming no heat loss to the surroundings, find the final equilibrium temperature of the system. (b) If, during the mixing, the calorimeter loses 120 J of heat to the surroundings, what is the new final temperature?

Answer Options

A. Without loss \\(T \\approx 58.7^{\\circ}\\text{C}\\); with 120 J loss \\(T' \\approx 58.6^{\\circ}\\text{C}\\).
Correct Answer B. Without loss \(T \approx 62.3^{\circ}\text{C}\); with 120 J loss \(T' \approx 62.2^{\circ}\text{C}\).
C. Without loss \\(T \\approx 60.5^{\\circ}\\text{C}\\); with 120 J loss \\(T' \\approx 60.4^{\\circ}\\text{C}\\).
D. Without loss \\(T \\approx 64.0^{\\circ}\\text{C}\\); with 120 J loss \\(T' \\approx 63.9^{\\circ}\\text{C}\\).
Correct Answer
B
Correct Option:
Without loss \(T \approx 62.3^{\circ}\text{C}\); with 120 J loss \(T' \approx 62.2^{\circ}\text{C}\).

About This Question

This is Neco Model Questions Vol1 2019 Physics Question 48. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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