AIEEE 2004 | Heat and Thermodynamics Question 379 | Physics

The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity $$K$$ and $$2K$$ and thickness $$x$$ and $$4x,$$ respectively, are $${T_2}$$ and $${T_1}\left( {{T_2} > {T_1}} \right).$$ The rate of heat transfer through the slab, in a steady state is $$\left( {{{A\left( {{T_2} - {T_1}} \right)K} \over x}} \right)f,$$ with $$f$$ equal to AIEEE 2004 Physics - Heat and Thermodynamics Question 355 English

AIEEE 2004 Physics - Heat and Thermodynamics Question 355 English

$${2 \over 3}$$

$${1 \over 2}$$

$$1$$

$${1 \over 3}$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

Which of the following statements is correct for any thermodynamic system ?

The change in entropy can never be zero

Internal energy and entropy and state functions

The internal energy changes in all processes

The work done in an adiabatic process is always zero,

AIEEE 2004

MCQ (Single Correct Answer)

-1

Two thermally insulated vessels $$1$$ and $$2$$ are filled with air at temperatures $$\left( {{T_1},{T_2}} \right),$$ volume $$\left( {{V_1},{V_2}} \right)$$ and pressure $$\left( {{P_1},{P_2}} \right)$$ respectively. If the value joining the two vessels is opened, the temperature inside the vessel at equilibrium will be

$${T_1}{T_2}\left( {{P_1}{V_1} + {P_2}{V_2}} \right)/\left( {{P_1}{V_1}{T_2} + {P_2}{V_2}{T_1}} \right)$$

$$\left( {{T_1} + {T_2}} \right)/2$$

$${{T_1} + {T_2}}$$

$${T_1}{T_2}\left( {{P_1}{V_1} + {P_2}{V_2}} \right)/\left( {{P_1}{V_1}{T_1} + {P_2}{V_2}{T_2}} \right)$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

If the temperature of the sun were to increase from $$T$$ to $$2T$$ and its radius from $$R$$ to $$2R$$, then the ratio of the radiant energy received on earth to what it was previously will be

$$32$$

$$16$$

$$4$$

$$64$$

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