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Test: Basic Thermodynamics terms - Chemistry MCQ


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10 Questions MCQ Test Physical Chemistry - Test: Basic Thermodynamics terms

Test: Basic Thermodynamics terms for Chemistry 2024 is part of Physical Chemistry preparation. The Test: Basic Thermodynamics terms questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Basic Thermodynamics terms MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Basic Thermodynamics terms below.
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Test: Basic Thermodynamics terms - Question 1

Which of the following property cannot be used to describe the state of a system?

Detailed Solution for Test: Basic Thermodynamics terms - Question 1

State functions are used to specify the state of a thermodynamic system. The state is described by measurable macroscopic particles like pressure, temperature, volume, amount, etc and the is P, V and T are called state variables.

Test: Basic Thermodynamics terms - Question 2

The system that does not allow the heat to pass through its boundary between the system and surroundings is called as _________ system.

Detailed Solution for Test: Basic Thermodynamics terms - Question 2

An adiabatic system does not allow the exchange of heat between system and surroundings. Energy is transferred to the surrounding only through work Done. In the adiabatic process, the total energy is given as zero.

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Test: Basic Thermodynamics terms - Question 3

An adiabatic process pressure is related to volume as _________

Detailed Solution for Test: Basic Thermodynamics terms - Question 3

Let P is pressure and V is volume whereas Gamma is the ratio of specific heat capacity at constant pressure and volume. The relation between pressure and volume in an adiabatic process is given by PVγ constant.

Test: Basic Thermodynamics terms - Question 4

An open system allows the transfer of ________

Detailed Solution for Test: Basic Thermodynamics terms - Question 4

An open system allows the transfer of both mass and energy into the system from the surroundings. An example of an open system is the human body, we consume food, energy and excrete waste.

Test: Basic Thermodynamics terms - Question 5

If the work is done on an adiabatic wall, then which of the following is true?

Detailed Solution for Test: Basic Thermodynamics terms - Question 5

In an adiabatic process, the total energy is always zero. We have that ΔH = ΔU + W, as ΔH is zero, we get ΔU + W = 0; ΔU = -W. But as work is done on the system by observing no heat W becomes negative, so ΔU = -(-)W = W. Hence ΔU = W.

Test: Basic Thermodynamics terms - Question 6

When work is done on system or by a system there is a change in _________

Detailed Solution for Test: Basic Thermodynamics terms - Question 6

When a work is done or by the system, heat passes into out of the system and matter enters or leaves the system, there is a change in internal energy of the system. It is represented by the symbol “U”.

Test: Basic Thermodynamics terms - Question 7

In an adiabatic process the work done is 50 KJ, what is its internal energy?

Detailed Solution for Test: Basic Thermodynamics terms - Question 7

The total energy in an adiabatic process is zero, so internal energy is equal to the negative of the work done. Here work done is given by 50 kilojoules, so the internal energy is -50 kilojoules as the sum of internal energy and the work done should be zero.

Test: Basic Thermodynamics terms - Question 8

The first law of thermodynamics states that the energy of an isolated system is constant.

Detailed Solution for Test: Basic Thermodynamics terms - Question 8

The first law of thermodynamics is commonly stated as the law of conservation of energy that is energy can neither be created nor be destroyed, in other terms we can also say that the energy of an isolated system is constant.

Test: Basic Thermodynamics terms - Question 9

Both isolated and closed systems are the same.

Detailed Solution for Test: Basic Thermodynamics terms - Question 9

An open system allows only energy transfer whereas an isolated system neither allows energy nor mass transfer through the system from the surroundings. Isolated and closed systems are not the same. So the above statement is false.

Test: Basic Thermodynamics terms - Question 10

The temperature of an object increases slowly, then the energy of that object _________

Detailed Solution for Test: Basic Thermodynamics terms - Question 10

Energy of a substance is directly proportional to its temperature. As we know that heat energy of a substance is q = mcΔT. If the temperature increases slowly then the energy also increases slowly.

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