MCQ SECOND LAW THERMODYNAMICS

 

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 SECOND LAW OF THERMODYNAMICS

There are two statements of Second Law.

Planck’s statement

There is no heat engine in the universe which can convert a certain quantity of heat into equivalent amount of work.

Clausius statement

Heat cannot flow from a body at lower temperature to a body at higher temperature without the use  of an external agent. This heat transfer from low to high temperature is refrigeration and this needs energy. Heat transfer from high to low temperature is by itself. Thus, second law talks of irreversibility.

MCQ SECOND LAW THERMODYNAMICS

  1. It is a law of
    • Reversibility
    • Irreversibility
    • Reversibility as well as ir-reversibility
    • None

ANS: (ii)

  1. A heat engine can convert following % of heat into work
    • 25 %
    • 50 %
    • 75 %
    • None

ANS: (iv)

  1. Heat flowing from high temperature body to low temperature body is
    • Refrigeration
    • Heat Transfer
    • Refrigeration as well as heat transfer
    • None

ANS: (ii)

  1. Heat flowing from low temperature body to high temperature body is
    • Refrigeration
    • Heat Transfer
    • Refrigeration as well as heat transfer
    • None

ANS: (i)

  1. There is no heat transfer in the
    • Isen-tropic process
    • Iso-baric process
    • Adiabatic process
    • None

ANS: (iv)

  1. Entropy is a measure of
    • Disorder
    • Order
    • Both order as well as disorder
    • None

ANS: (i)

  1. Heat transfer depends on
    • Entropy difference
    • Enthalpy difference
    • Internal energy difference
    • None

ANS: (iv)

  1. Heat transfer depends on
    • Temperature difference
    • Pressure difference
    • Internal energy difference
    • None

ANS: (i)

  1. A Carnot cycle is a
    • Refrigeration cycle
    • Power consuming cycle
    • Power producing cycle
    • None

ANS: (iii)

  1. A Carnot cycle consists of
    • Ir-reversible processes
    • Reversible processes
    • Ir-reversible and reversible processes
    • None

ANS: (ii)

  1. COP is maximum for a
    • Carnot cycle
    • Otto cycle
    • Diesel cycle
    • None

ANS: (iv)

  1. Work input is maximum for a
    • Isen-tropic compression
    • Iso-baric compression
    • Iso-metric compression
    • None

ANS: (iv)

  1. Work input is maximum for a
    • Isothermal compression
    • Iso-enthalpy compression
    • Adiabatic compression

 

  • None

ANS: (i)

  1. During a reversible process, the entropy reduces to
    • 5
    • 75
    • 95
    • None

AND: (iv)

  1. During an ir-reversible process, the entropy reduces to
    • 5
    • 75
    • 95
    • None

AND: (iv)

  1. Second law of Thermodynamics is also known as the law of

(i) Decreased entropy

(ii) Increased entropy

(iii) Decreased as well increased entropy

  • None

ANS: (ii)

  1. Second law of thermodynamic lead to the discovery of
    • Internal energy
    • Enthalpy
    • Entropy
    • None

ANS: (iii)

  1. Efficiency of a heat engine is governed under which law of thermodynamics
    • Third
    • (zeroth
    • First
    • None

ANS: (iv)

  1. Efficiency of a heat engine is governed under which law of thermodynamics
    • Second
    • (zeroth
    • First
    • None

ANS: (i)

  1. Second Law of Thermodynamics deals with
    • Quality of energy
    • Quantity of energy
    • Both quality and quantity of energy
    • None

ANS: (i)

  1. A process feasibility is governed by which law of thermodynamics
    • First
    • Second
    • Third
    • None

ANS: (iv)

  1. A process feasibility is governed by which law of thermodynamics
    • First
    • Second
    • Both First and Second
    • None

ANS: (iii)

  1. Mathematically second law of thermodynamics is represented by
    • ∆s Univ > 0
    • ∆s Univ < 0
    • ∆s Univ£ 0
    • NONE

ANS: (i)