1
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

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 $$=1 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1}$$)

A
0.04%
B
0.05%
C
0.1%
D
0.08%
2
AP EAPCET 2022 - 4th July Evening Shift
+1
-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

A
40 J
B
100 J
C
30 J
D
20 J
3
AP EAPCET 2022 - 4th July Evening Shift
+1
-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

A
$$\frac{1}{3} \times 10^3 \mathrm{~K}$$
B
$$\frac{1}{2} \times 10^3 \mathrm{~K}$$
C
200 K
D
$$\frac{1}{6} \times 10^3 \mathrm{~K}$$
4
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

In non-rigid diatomic molecule with an additional vibrational mode

A
$$81 C_V^2=49 C_p^2$$
B
$$49 C_V^2=25 C_p^2$$
C
$$49 C_V^2=81 C_p^2$$
D
$$25 C_V^2=49 C_p^2$$
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