Thermodynamics-Thermal Equilibrium (KVPY Stream-SA (Class 11) Physics): Questions 1 - 3 of 3

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Question number: 1

» Thermodynamics » Thermal Equilibrium

Appeared in Year: 2011

MCQ▾

Question

The following three objects (1) a metal tray, (2) a block of wood, and (3) a woolen cap are left in a closed room overnight. Next day the temperature of each is recorded as T 1, T 2 and T 3 respectively. The likely situation is.

Choices

Choice (4) Response

a.

T3=T2>T1

b.

T3>T2=T1

c.

T1=T2=T3

d.

T3>T2>T1

Question number: 2

» Thermodynamics » Thermal Equilibrium

MCQ▾

Question

A magnesium piece of mass 30 g initially at 350 °C is dipped quickly and taken out of 1 kg of water, initially at 45° C. if the temperature of the magnesium piece immediately after being taken out of the water is found to be 180°C, what is the temperature of the water then? (Specific heat capacities of magnesium and water are 1020 J kg–1 K–1 and 4200 J kg–1, respectively. )

Choices

Choice (4) Response

a.

23.5°C

b.

48°C

c.

38.65°C

d.

46.24°C

Question number: 3

» Thermodynamics » Thermal Equilibrium

Appeared in Year: 2014

MCQ▾

Question

An aluminum piece of mass 50 g initially at 300 °C is dipped quickly and taken out of 1 kg of water, initially at 30° C. if the temperature of the aluminum piece immediately after being taken out of the water is found to be 160°C, what is the temperature of the water then? (Specific heat capacities of aluminum and water are 900 J kg–1 K–1 and 4200 J kg–1, respectively. )

Choices

Choice (4) Response

a.

31.5°C

b.

45°C

c.

28.5°C

d.

165°C

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