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Physics Part-II
Class 11
NCERT
1
Chapter 1: Mechanical Properties of Solids
28 questions
2
Chapter 2: Mechanical Properties of Fluids
40 questions
3
Chapter 3: Thermal properties of Matter
32 questions
4
Chapter 4: Thermodynamics
27 questions
Q1
What amount of heat must be supplied to of nitrogen (at room temperature) to raise its temperature by at constant pressure? (Molecular mass of .)
Q2
Explain why
(a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature (T +T)/2
(b) The coolant in a chemical or a nuclear plant (i.e. the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat
(c) Air pressure in a car tyre increases during driving
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude
(a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature (T +T)/2
(b) The coolant in a chemical or a nuclear plant (i.e. the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat
(c) Air pressure in a car tyre increases during driving
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude
Q3
A cylinder with a movable piston contains 3 moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is compressed to half its original volume?
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Chapter 5: Kinetic Theory
18 questions
6
Chapter 6: Oscillations
35 questions
7
Chapter 7: Waves
34 questions
Question
Medium
Solving time: 2 mins
Explain why
(a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature (T +T)/2
(b) The coolant in a chemical or a nuclear plant (i.e. the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat
(c) Air pressure in a car tyre increases during driving
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude
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Text solution
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(a)
Law of conservation of Energy says that the energy is transferred from one body to another and from one format to another.
If we consider ideal conditions for heat transfer, when two bodies of temperature and come in thermal contact, heat transfer takes place from body of higher temperature to body of lower temperature.
The quantity thermal energy is the function of mass and temperature. Hence, the mean temperature of the bodies in contact will be given by the weighted average not normal average.
Hence only when , then
If we consider ideal conditions for heat transfer, when two bodies of temperature and come in thermal contact, heat transfer takes place from body of higher temperature to body of lower temperature.
The quantity thermal energy is the function of mass and temperature. Hence, the mean temperature of the bodies in contact will be given by the weighted average not normal average.
Hence only when , then
(b)
A coolant is required to have high heat capacity so that its temperature does not change much during heat transfer. Due to this, the coolant is able to hold more heat and allows quicker temperature drop in the hot body.
(c)
As the car moves, temperature of the gas inside the tyre increases.
Since volume is almost constant, air pressure increases.
(d)
Water has a very high value of specific heat capacity. Due to this, the temperature of the water bodies do not change easily. Hence, climate near a harbour town is moderate.
Sand has a very low value of specific heat capacity. Due to this, the temperature of the sand changes rapidly. Hence, climate of a desert is extreme.
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Practice more questions from Physics Part-II (NCERT)
Q1
What amount of heat must be supplied to of nitrogen (at room temperature) to raise its temperature by at constant pressure? (Molecular mass of .)
Q2
Explain why
(a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature (T +T)/2
(b) The coolant in a chemical or a nuclear plant (i.e. the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat
(c) Air pressure in a car tyre increases during driving
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude
(a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature (T +T)/2
(b) The coolant in a chemical or a nuclear plant (i.e. the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat
(c) Air pressure in a car tyre increases during driving
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude
Q3
A cylinder with a movable piston contains 3 moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is compressed to half its original volume?
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| Question Text | Explain why (a) Two bodies at different temperatures T and T if brought in thermal contact do not necessarily settle to the mean temperature (T +T)/2 (b) The coolant in a chemical or a nuclear plant (i.e. the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat (c) Air pressure in a car tyre increases during driving (d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude |
| Updated On | Mar 6, 2022 |
| Topic | Thermodynamics |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 3 |
| Upvotes | 329 |
| Avg. Video Duration | 10 min |
