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Heat and Thermodynamics Physics - Heat and Thermodynamics

Tamil Nadu Board - STD 11 - Physics (Tamil - English Medium). 125 questions in this chapter.

Question types

Heat and Thermodynamics question types

125 questions across 3 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

125
Questions
3
Question groups
5
Question types
Sample Questions

Heat and Thermodynamics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
The coefficient of performance of a refrigerator is $5$. If the temperature inside freezer is $– 20°C$, the temperature of the surroundings to which it rejects heat is ……
  • A
    $ 21°C$
  • ✓
    $31°C$
  • C
    $ 41°C$
  • D
    $ 11°C$

Answer: B.

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Q 2MCQ1 Mark
The heat required to increase the temperature of 4 moles of a mono-atomic ideal gas from 273 K to 473 K constant volume is ….
  • A
    200 R
  • B
    400 R
  • C
    800 R
  • ✓
    1200 R

Answer: D.

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Q 3MCQ1 Mark
The ratio of the specific heat $\frac{C_p}{C_v}=\gamma$ in term of degrees of freedom (n) is given by:
  • A
    $\left(1+\frac{n}{3}\right)$
  • ✓
    $\left(1+\frac{2}{n}\right)$
  • C
    $\left(1+\frac{n}{2}\right)$
  • D
    $\left(1+\frac{1}{n}\right)$

Answer: B.

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Q 4MCQ1 Mark
A carnot engine operates with source at 127°C and sink at 27°C. If the source supplies 40 KJ of heat energy, the work done by the engine is
  • A
    1 KJ
  • B
    4 KJ
  • ✓
    10 KJ
  • D
    30 KJ

Answer: C.

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Q 5MCQ1 Mark
A carnot engine takes heat from a reservoir at 627°C and rejects heat to a sink at 27°C. Its efficiency is
  • A
    3/5
  • B
    $1 / 3$
  • ✓
    $2 / 3$
  • D
    200/209

Answer: C.

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Q 11[ 3 Marks Questions ]3 Marks
A carnot engine, having efficiency of $\eta=\frac{1}{10}$ as heat engine, is used as a refrigerator. If the work done on the system is $10 J$, then find the amount of energy absorbed from the reservoir at lower temperature.
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Q 12[ 3 Marks Questions ]3 Marks
A perfect gas goes from state A to state B by absorbing $8 \times 10^5 J$ of heat and doing $6.5 \times 10^5 J$ of external work. It is now transferred between the same two states in another process in which it absorbs 10s J of heat. In second process. Find the work done in the second process.
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Q 13[ 3 Marks Questions ]3 Marks
A carnot engine operating between temperature $T_1$ and $T_2$ has efficiency $\frac{1}{6}$. When $T_2$ is lowered by $62 K$, its efficiency increases to $\frac{1}{3}$. Then find the values of $T_1$ and $T_2$.
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Q 14[ 3 Marks Questions ]3 Marks
A mass of ideal gas at pressure P is expanded isothermally to four times the original volume and then slowly compressed adiabatically to its original volume. Assuming γ(= CP/CV) to be 1.5, find the new pressure of the gas.
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Q 15[ 3 Marks Questions ]3 Marks
For a gas the difference between the two specific heats is 4150 J/Kg K. What is the specific heat of the gas at constant volume if the ratio of specific heat is 1.4?
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