MHT CET 2019 2nd May Morning Shift | Heat and Thermodynamics Question 143 | Physics

If ' $C_P$ ' and ' $C_V$ ' are molar specific heats of an ideal gas at constant pressure and volume respectively. If ' $\lambda$ ' is the ratio of two specific heats and ' $R$ ' is universal gas constant then ' $C_p$ ' is equal to

$\frac{R \gamma}{\gamma-1}$

$\gamma R$

$\frac{1+\gamma}{1-\gamma}$

$\frac{R}{\gamma-1}$

MHT CET 2019 2nd May Morning Shift

MCQ (Single Correct Answer)

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A clock pendulum having coefficient of linear expansion. $\alpha=9 \times 10^{-7} /{ }^{\circ} \mathrm{C}^{-1}$ has a period of 0.5 s at $20^{\circ} \mathrm{C}$. If the clock is used in a climate, where the temperature is $30^{\circ} \mathrm{C}$, how much time does the clock lose in each oscillation? ( $g=$ constant)

$25 \times 10^{-7} \mathrm{~s}$

$5 \times 10^{-7} \mathrm{~s}$

$1.125 \times 10^{-6} \mathrm{~s}$

$2.25 \times 10^{-6} \mathrm{~s}$

MHT CET 2019 2nd May Morning Shift

MCQ (Single Correct Answer)

-0

If $\alpha$ is the coefficient of performance of a refrigerator and ' $Q$ ' is heat released to the hot reservoir, then the heat extracted from the cold reservoir ' $Q_2$ ' is

$\frac{\alpha Q_1}{\alpha-1}$

$\frac{\alpha-1}{\alpha} Q_1$

$\frac{\alpha Q_1}{1+\alpha}$

$\frac{1+\alpha}{\alpha} Q_1$

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