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Thermodynamics MCQs for NEET — Physics Questions with Answers

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Two liquids of equal volume are throughly mixed. If their specific heat are $C_1, C_2$, temperatures $ \theta_1, \theta_ 2$ and densities $d_1, d_2$ respectively. What is the final temperature of the mixture ?

A. $ { d_1 c_1 \theta_1 + d_2 c_2 \theta_2 \over d_1 \theta_1 + d_2 \theta_2 } $ B. $ { c_1 \theta_1 + c_2 \theta_2 \over d_1 c_1 + d_2 c_2 } $ C. $ { d_1 \theta_1 + d_2 \theta_2 \over c_1 \theta_1 + c_2 \theta_2 } $ D. $ { d_1 c_1 \theta_1 + d_2 c_2 \theta_2 \over d_1 c_1 + d_2 c_2 } $

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Explanation

$ mC_1 ( \theta_1 - \theta_e ) = m C_2 ( \theta_e - \theta_2 ) $ $ Vd_1C_1 ( \theta_1 - \theta_e) = Vd_2 C_2( \theta_e - \theta_2) $ $ \Rightarrow d_1 c_1 \theta_1 -(d_1c_1) \theta_e = (d_2 c_2) \theta_e - d_2 c_2 \theta_2 $

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Amount of heat required to raise the temprature of a body through 1k is called it is

A. Water equivalent B. Thermal capacity C. Entropy D. Specific heat

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Explanation

$ \theta = m.c \triangle \theta $ ; if $ \triangle \theta = 1k $ then $ \theta = mc Thermal capacity$

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Assertion & Reason Read the assertion and reason carefully to mark the correct option out of the option given below. Assertion : Melting of solid causes no change in internal energy. Reason :Latent heat is the heat required melt a unit mass of solid.

A. If both assertion and reason are true but reason is the correct explanation of the assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If assertion is true but reason is false D. If the assertion and reason both are false. E. If assertion is false but reason is true.

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Explanation

Melting is associated with increasing of internal energy without change in temperature in view of the reason being correct the amount of heat absorbed or given out during change of state is expressed where m is the mass of the substances and L is the latent heat of the substance.

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A difference of temperature of $25 ^\circ C $ is equivalent to a difference of

A. $ 72 ^\circ F $ B. $ 45 ^\circ F $ C. $ 32 ^\circ F $ D. $ 25 ^\circ F $

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Explanation

$ { \triangle C \over 100 ^\circ } = { \triangle F \over 180 ^\circ } $ $ \therefore {25 \over 100} = { \triangle F \over 180 } $

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What is the value of absolute temperature on the Celsius Scale ?

A. $ - 273 .15 ^\circ C $ B. $ 100 ^\circ C $ C. $ - 32 ^\circ C $ D. $ 0 ^\circ C $

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Explanation

$ T = 273.15 + t^\circ C $ $ 0 = 273.15 + t^\circ C $

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The temperature of a substance increases by $ 27 ^\circ $ What is the value of this increase of Kelvin scale ?

A. 300 K B. 2-46 K C. 7K D. 27 K

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Explanation

equal

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At Which temperature the density of water is maximum?

A. $ 4 ^\circ F$ B. $ 42 ^\circ F$ C. $ 32 ^\circ F$ D. $ 39.2 ^\circ F$

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Explanation

$ 4 ^\circ $

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The temperature on celsius scale is $ 25 ^\circ C $ . What is the corresponding temperature on the Fahrenheit Scale?

A. $ 40 ^\circ F $ B. $ 45 ^\circ F $ C. $ 50 ^\circ F $ D. $ 77 ^\circ F $

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Explanation

$ { c \over 5 } = {F -32 \over 9 } $

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The temperature of a body on Kelvin Scale is found to be x.K.when it is measured by Fahrenhit thesmometes. it is found to be $x^0F$ , then the value of x is .

A. 313 B. 301.24 C. 574-25 D. 40

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Explanation

$ {F -32 \over 9 } = { K -273 \over 5 } $

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A Centigrade and a Fahrenhit thesmometes are dipped in boiling wates-The wates temperature is lowered until the Farenhit thesmometes registered $140 ^\circ $ what is the fall in thrmometers

A. $ 80 ^\circ $ B. $ 60 ^\circ $ C. $ 40 ^\circ $ D. $ 30 ^\circ $

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Explanation

$ { \triangle Tc \over 100 } = { \triangle TF \over 180 } $ $ { \triangle Tc \over 100 } \triangle TC = 40 ^ \circ C $

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