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Physics M.C.Q (1 Marks)

PART - 2 CH - 11 Thermodynamics · Rajasthan Board (RBSE) STD 11 Science (Rajasthan - English Medium). 36 questions.

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M.C.Q (1 Marks)

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36 questions · timed · auto-graded

MCQ 11 Mark
If opened door of a refrigerator in working condition kept in an insulated room:
  • A
    The temperature of the room will reduce to a certain degree.
  • B
    The room can be cooled to the temperature of a refrigerator.
  • ✓
    The room will become a little warmer.
  • D
    The room will be neither hot nor cold.
Answer
Correct option: C.
The room will become a little warmer.
C
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MCQ 21 Mark
The initial pressure of a gas is P. It is adiabatic compressed due to which its density becomes four times its initial density. The final pressure of the gas will be: ${\gamma = 1.5}$
  • A
    4P
  • B
    16P
  • C
    2P
  • ✓
    8P
Answer
Correct option: D.
8P
D
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MCQ 31 Mark
Which thermodynamic property has the same value in systems when they are in thermal equilibrium?
  • ✓
    Heat
  • B
    Pressure
  • C
    Volume
  • D
    None of these
Answer
Correct option: A.
Heat
A
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MCQ 41 Mark
If the specific heats per gram of an ideal gas of molecular weight M are represented by Cp and $C _{ \text v }$ then :
  • A
    $C _{ P }- C _{ V }=\frac{ R }{ M ^2}$
  • B
    $C _{ P }- C _{ V }= R$
  • ✓
    $C_p-C_V=\frac{R}{M}$
  • D
    $C _{ P }- C _{ V }= MR$
Answer
Correct option: C.
$C_p-C_V=\frac{R}{M}$
C
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MCQ 51 Mark
Which of the following processes is irreversible?
  • A
    Slow isothermal change
  • B
    Slow adiabatic change
  • C
    Evaporation process
  • ✓
    Diffusion of gases
Answer
Correct option: D.
Diffusion of gases
D
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MCQ 61 Mark
Complete conversion of heat into work by a device, it is not possible. This statement is given :
  • A
    From the zeroth law of thermodynamics
  • B
    From the first law of thermodynamics
  • ✓
    From the second law of thermodynamics
  • D
    According to Joule's law
Answer
Correct option: C.
From the second law of thermodynamics
C
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MCQ 71 Mark
If an electric fan is run in a heat-insulated closed room, then the temperature of the roons air will be:
  • A
    less
  • ✓
    m ore
  • C
    unchanged
  • D
    first less then more
Answer
Correct option: B.
m ore
B
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MCQ 81 Mark
An engine works between temperatures of $727^{\circ}\text C $ and $227^{\circ}\text C.$ The maximum possible efficiency of the engine is :
  • ✓
    $\frac{1}{2}$
  • B
    $\frac{1}{4}$
  • C
    $\frac{3}{4}$
  • D
    $1$
Answer
Correct option: A.
$\frac{1}{2}$
A
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MCQ 91 Mark
The volume of one litre of gas is constant at 1 Atomos $(10^5 N / m ^2).$ It doubles as it expands under pressure. What will be the work done by the gas?
  • A
    $10^5$ joules
  • B
    $10^4$ joules
  • C
    $10^3$ joules
  • ✓
    $10^2$ joules
Answer
Correct option: D.
$10^2$ joules
D
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MCQ 101 Mark
The heat engine with maximum efficiency is:
  • A
    diesel engine
  • B
    steam engine
  • C
    auto engine
  • ✓
    Carnot engine
Answer
Correct option: D.
Carnot engine
D
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MCQ 111 Mark
The efficiency of an engine working between temperatures $T _1$ and $T _2$ is :
  • A
    $\left(1-\frac{T_1}{T_2}\right)$
  • ✓
    $\left(1-\frac{T_2}{T_1}\right)$
  • C
    $\left(\frac{T_1}{T_2}-1\right)$
  • D
    $\left(\frac{T_1-T_2}{T_2}\right)$
Answer
Correct option: B.
$\left(1-\frac{T_2}{T_1}\right)$
B
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MCQ 121 Mark
The temperature at which all three states of matter are in equilibrium is called:
  • A
    Critical point
  • ✓
    Triple point
  • C
    Inversion point
  • D
    Boyle point
Answer
Correct option: B.
Triple point
B
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MCQ 131 Mark
Internal energy of the working fluid after completing the Carnot cycle:
  • A
    Increases
  • B
    Decreases
  • C
    The source temperature depends on $T_1$ and the sink temperature $T_2.$
  • ✓
    Is equal to the initial value
Answer
Correct option: D.
Is equal to the initial value
D
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MCQ 141 Mark
The efficiency of a frictionless engine can be 100% only when the heat sink is:
  • A
    Equal to the temperature of the source
  • B
    Less than the temperature of the source
  • ✓
    $0\text K$
  • D
    $0^{\circ}\text C $
Answer
Correct option: C.
$0\text K$
C
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MCQ 151 Mark
Efficiency of all reversible heat engines working between same temperatures:
  • ✓
    Same
  • B
    Depend on the working substance
  • C
    Changes with change in pressure
  • D
    Depend on other physical quantities
Answer
Correct option: A.
Same
A
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MCQ 161 Mark
The value of internal energy of an ideal gas depends on :
  • A
    pressure
  • B
    volume
  • ✓
    temperature
  • D
    all of these
Answer
Correct option: C.
temperature
C
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MCQ 171 Mark
In isothermal, isobaric and adiabatic processes, the value of work done for equal volume change is minimum:
  • A
    Isothermal
  • B
    Isobaric
  • ✓
    Adiabatic
  • D
    None of these
Answer
Correct option: C.
Adiabatic
C
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MCQ 181 Mark
The efficiency of an engine will be maximum when it works:
  • A
    Between 300K and 250K temperature
  • B
    Between 600k and 300K temperature
  • C
    Between 800K and 400K temperature
  • ✓
    Between 100K and 10K temperature
Answer
Correct option: D.
Between 100K and 10K temperature
D
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MCQ 191 Mark
It is true for adiabatic change:
  • A
    $PV ^{\gamma-1}=$ Constant
  • ✓
    $TV ^{\gamma^{-1}}=$ Constant
  • C
    $T ^{\gamma^{-1} V}=$ Constant
  • D
    TV ${ }^\gamma=$ Constant
Answer
Correct option: B.
$TV ^{\gamma^{-1}}=$ Constant
B
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MCQ 201 Mark
The process of transformation of liquid into vapor is:
  • A
    Only isothermal process
  • B
    Only isobaric process
  • C
    Only adiabatic process
  • ✓
    Isothermal and isobaric process
Answer
Correct option: D.
Isothermal and isobaric process
D
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MCQ 211 Mark
The value of PV for one mole of ideal gas is:
  • ✓
    2 calories
  • B
    2 kilo calories
  • C
    4.18 calories.
  • D
    4.18 kcal
Answer
Correct option: A.
2 calories
A
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MCQ 221 Mark
Which of the following processes is not heat-resistant:
  • A
    Sudden opening of a cylinder filled with $\text {CO}_2$ gas
  • ✓
    Melting of ice.
  • C
    Propagation of longitudinal waves in air.
  • D
    Sudden bursting of a balloon filled with air.
Answer
Correct option: B.
Melting of ice.
B
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MCQ 231 Mark
First law of thermodynamics:
  • A
    Explains temperature.
  • B
    Defines heat
  • C
    Expresses the maximum limit mechanical energy being converted into heat.
  • ✓
    Expresses the equivalence of heat and mechanical energy.
Answer
Correct option: D.
Expresses the equivalence of heat and mechanical energy.
D
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MCQ 241 Mark
In the expansion of a gas in the adiabatic process:
  • A
    There is no change in temperature
  • ✓
    Temperature decreases
  • C
    Temperature increases
  • D
    Temperature first increases and then decreases
Answer
Correct option: B.
Temperature decreases
B
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MCQ 251 Mark
A Carnot engine works between temperatures of $727^{\circ}\text C $ and $27^{\circ}\text C $ The efficiency of the engine will be :
  • ✓
    0.7
  • B
    0.96
  • C
    0.35
  • D
    0.29
Answer
Correct option: A.
0.7
A
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MCQ 261 Mark
In thermal compression, the body's:
  • A
    pressure decreases
  • B
    temperature decreases
  • ✓
    temperature increases
  • D
    heat increases
Answer
Correct option: C.
temperature increases
C
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MCQ 271 Mark
Change in intermal energy of ideal gas in cyclic process :
  • A
    depends on pressure
  • B
    depends on volume
  • C
    depends on the path
  • ✓
    is zero
Answer
Correct option: D.
is zero
D
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MCQ 281 Mark
When will the efficiency of Carnot engine be high?
  • ✓
    When the temperature of the source is increased
  • B
    When the temperature of the sink is increased
  • C
    Efficiency of the engine remains constant
  • D
    Nothing can be said
Answer
Correct option: A.
When the temperature of the source is increased
A
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MCQ 291 Mark
The first law of thermodynamics can be explained as :
  • A
    According to Boyle's law
  • B
    By Charles's law
  • ✓
    According to Joule's law
  • D
    From the gas equation
Answer
Correct option: C.
According to Joule's law
C
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MCQ 301 Mark
Why does the air coming out of a tube due to a puncture appear cold?
  • ✓
    In the adiabatic process
  • B
    Through isothermal process
  • C
    By giving heat to the atmosphere
  • D
    By taking heat from the atmosphere
Answer
Correct option: A.
In the adiabatic process
A
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MCQ 311 Mark
Zeroth Law of Thermodynamics :
  • ✓
    Defines temperature.
  • B
    Defines heat.
  • C
    Defines the equivalence of heat and mechanical energy.
  • D
    Determines the direction of heat flow.
Answer
Correct option: A.
Defines temperature.
A
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MCQ 321 Mark
In isothermal process, the work done per gram molecule of gas is:
  • A
    RT $\log _{10}\left(\frac{V_2}{V_1}\right)$
  • B
    $RT \log _{10}\left(\frac{V_1}{V_2}\right)$
  • ✓
    $RT$ $\log _e\left(\frac{V_2}{V_1}\right)$
  • D
    $RT$ $\log _{ e }\left(\frac{ V _1}{V_2}\right)$
Answer
Correct option: C.
$RT$ $\log _e\left(\frac{V_2}{V_1}\right)$
C
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MCQ 331 Mark
A thermos bottle filled with tea is shaken vigorously. The internal energy of the system (tea) will :
  • ✓
    increase
  • B
    there will be a decrease
  • C
    there will be no change
  • D
    none of these.
Answer
Correct option: A.
increase
A
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MCQ 341 Mark
The internal energy of an ideal gas depends only on:
  • A
    pressure
  • B
    volume
  • ✓
    temperature
  • D
    size of molecules
Answer
Correct option: C.
temperature
C
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MCQ 351 Mark
In a cyclic process :
  • A
    Work done is zero.
  • ✓
    The work done by the system is equal to the heat given to the system.
  • C
    Work done does not depend on heat.
  • D
    The internal energy of the system increases
Answer
Correct option: B.
The work done by the system is equal to the heat given to the system.
B
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MCQ 361 Mark
On giving 120 joules of heat to a gas, its internal energy increases by 50 joules. The external work done is:
  • A
    170 joules
  • B
    50 joules
  • C
    120 joules
  • ✓
    70 joules
Answer
Correct option: D.
70 joules
D
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