AP EAPCET 2022 - 4th July Evening Shift | Heat and Thermodynamics Question 6 | Physics

A metal tape is calibrated at $$25^{\circ} \mathrm{C}$$. On a cold day when the temperature is $$-15^{\circ} \mathrm{C}$$, the percentage error in the measurement of length is

(Coefficient of linear expansion of metal $$=1 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1}$$)

0.04%

0.05%

0.1%

0.08%

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

A gas is expanded from an initial state to a final state along a path on a $$p$$-$$V$$ diagram. The path consists of (i) an isothermal expansion of work 50 J , (ii) an adiabatic expansion and (iii) an isothermal expansion of work 20 J . If the internal energy of gas is changed by $$-$$30 J , then the work done by gas during adiabatic expansion is

40 J

100 J

30 J

20 J

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

The temperature of the sink of a Carnot engine is 250 K . In order to increase the efficiency of the Carnot engine from $$25 \%$$ to $$50 \%$$, the temperature of the sink should be increased by

$$\frac{1}{3} \times 10^3 \mathrm{~K}$$

$$\frac{1}{2} \times 10^3 \mathrm{~K}$$

200 K

$$\frac{1}{6} \times 10^3 \mathrm{~K}$$

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

In non-rigid diatomic molecule with an additional vibrational mode

$$81 C_V^2=49 C_p^2$$

$$49 C_V^2=25 C_p^2$$

$$49 C_V^2=81 C_p^2$$

$$25 C_V^2=49 C_p^2$$

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