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Grade 11 Exam  >  Grade 11 Tests  >  Assertion & Reason Test: Thermodynamics - Grade 11 MCQ

Assertion & Reason Test: Thermodynamics - Grade 11 MCQ


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10 Questions MCQ Test - Assertion & Reason Test: Thermodynamics

Assertion & Reason Test: Thermodynamics for Grade 11 2024 is part of Grade 11 preparation. The Assertion & Reason Test: Thermodynamics questions and answers have been prepared according to the Grade 11 exam syllabus.The Assertion & Reason Test: Thermodynamics MCQs are made for Grade 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Thermodynamics below.
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Assertion & Reason Test: Thermodynamics - Question 1
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Assertion : Reversible systems are difficult to find in real world.

Reason : Most processes are dissipative in nature

Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 1
In a perfectly reversible system, there is no loss of energy. Losses can be minimised, friction can be reduced, the resistance in L-C oscillating system can also be negligible. But one cannot completely eliminate energy losses. This makes a perfectly reversible system, an ideal.
Assertion & Reason Test: Thermodynamics - Question 2
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Assertion : Thermodynamic process in nature are irreversible.

Reason : Dissipative effects can not be eliminated.

Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 2
In reversible process, there always occurs some loss of energy. This is because energy spent in working against the dissipative force is not recovered back. Some irreversible process occur in nature such as friction where extra work to cancel the effect of friction. Salt dissolves in water but a salt does not separate by itself into pure salt and pure water.
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Assertion & Reason Test: Thermodynamics - Question 3
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Assertion : The isothermal curves intersect each other at a certain point.

Reason : The isothermal change takes place slowly, so the isothermal curves have very little slope.

Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 3
As isothermal processes are very slow and so the different isothermal curves have different slopes so they cannot intersect each other.
Assertion & Reason Test: Thermodynamics - Question 4
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Assertion : We can not change the temperature of a body without giving (or taking) heat to (or from) it.

Reason : According to principle of conservation of energy, total energy of a system should remains conserved.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 4
We can change the temperature of a body without giving (or taking) heat to (or from) it. For example in an adiabatic compression temperature rises and in an adiabatic expansion temperature false, although no heat is given or taken from the system in the respective changes.
Assertion & Reason Test: Thermodynamics - Question 5
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Assertion : The specific heat of a gas is an adiabatic process is zero and in an isothermal process is infinite.

Reason : Specific heat of a gas in directly proportional to change of heat in system and inversely proportional to change in temperature.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 5
In adiabatic process, no heat transfer takes place between gas and surrounding

i.e., ΔQ = 0

From definition of specific heat,

C = ΔQ/mΔT = 0

Again, for isothermal process

ΔT = 0

∴ C = ΔQ/mΔT = ∞

Assertion & Reason Test: Thermodynamics - Question 6
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Assertion : The heat supplied to a system is always equal to the increase in its internal energy.

Reason : When a system changes from one thermal equilibrium to another, some heat is absorbed by it.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 6
According to first law of thermodynamics, ΔQ = ΔU + ΔW = ΔU + PΔV. If heat is supplies in such a manner that volume does not change ΔV = 0 i.e., isochoric process, then whole of the heat energy supplied to the system will increase internal energy only. But, in any other process it is not possible. Also heat may absorbed or evolved when state of thermal equilibrium changes.
Assertion & Reason Test: Thermodynamics - Question 7
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Assertion : A room can be cooled by opening the door of a refrigerator in a closed room.

Reason : Heat flows from lower temperature (refrigerator) to higher temperature (room).
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 7
When the door of refrigerator is kept open, heat rejected by the refrigerator to the room will be more than the heat taken by the refrigerator from the room (by an amount equal to work done by the compressor). Therefore, temperature of room will increase and so it will be warmed gradually. As according to 2nd law of thermodynamics, heat cannot be transferred on its own, from a body at lower temperature to another at higher temperature.
Assertion & Reason Test: Thermodynamics - Question 8
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Assertion : If an electric fan be switched on in a closed room, the air of the room will be cooled.

Reason : Fan air decrease the temperature of the room.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 8
If an electric fan is switched on in a closed room, the air will be heated because due to motion of the fan, the speed of air molecules will increase. In fact, we feel cold due to evaporation of our sweat.
Assertion & Reason Test: Thermodynamics - Question 9
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Assertion : The internal energy of an isothermal process does not change.

Reason : The internal energy of a system depends only on pressure of the system.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 9
The internal energy of system depends only on its temperature. In isothermal process temperature does not change, therefore, internal energy of the system remains the same.
Assertion & Reason Test: Thermodynamics - Question 10
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Assertion : An adiabatic process is an isentropic process.

Reason : Change in entropy is zero in case of adiabatic process.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 10
Basically isentropic process is just a process in which entropy of system remains constant. And adiabatic is the process in which the heat transfer is zero in the process. When the adiabatic process is carried out reversibally then it is called isentropic process.
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