Q. Which of the following contribute to the reason behind the origin of surface tension?

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Q. What will be the diameter (in mm) of a water droplet, the pressure inside which is 0.05 N/cm² greater than the outside pressure? (Take surface tension as 0.075 N/m)

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Q. A soap bubble of d mm diameter is observed inside a bucket of water. If the pressure inside the bubble is 0.075 N/cm², what will be the value of d? (Take surface tension as 0.075 N/m)

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Q. A liquid jet of 5 cm diameter has a pressure difference of N/m². (Take surface tension as 0.075 N/m)

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Q. The rise in the level of a liquid in a tube is h. What will be the rise in the level if the same amount of liquid is poured into a tube of half the diameter.

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Q. The ratio of the surface tension S and density ρ of liquid 1 and 2 are 1:2 and 1:4 respectively. Equal amount of the two liquids is poured into two identical tubes. What will be the ratio of the rise in the liquid level in the two tubes? (Assume the angle of contact to be same)

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Q. The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in liquid level?

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Q. If a glass tube of 10 mm diameter is immersed in water, what will be the rise or fall in capillary?

(Take surface tension = 0.075 N/m, g = 10 m/s² and angle of contact = 0)

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Q. A water drop of diameter 1 cm breaks into 1000 similar droplets of same diameter. What will be the gain or loss in the surface energy? (Take surface tension as 0.075 N/m)

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Q. If there is no exchange of heat between system and surrounding where system comprises of a compressible fluid but the heat is generated due to friction, the process is an adiabatic.

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Q. For a compressible fluid, if there is no change in specific volume at constant temperature, what type of process it is?

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Q. If the fluid is incompressible, do thermodynamic properties play an important role in its behaviour at varying temperature and pressure?

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Q. If for same temperature and pressure change, the value of bulk modulus is compared for isothermal process and adiabatic process, which one would be higher?

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Q. The value of gas constant is same for all the gases.

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Q. Calculate the pressure exerted by 9 kg of air at a temperature of 20℃ if the volume is 0.8m³. Assuming ideal gas laws are applicable.

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Q. A gas weighs 16 N/m³ at 30℃ and at an absolute pressure of 0.35 N/mm². Determine the gas constant.

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Q. A cylinder of 0.8 m³ in volume contains superheated steam at 70℃ and 0.4 N/m² absolute pressure. The superheated steam is compressed to 0.3 . Find pressure and temperature.

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Q. Determine the compressibility of an incompressible fluid, if the pressure of the fluid is changed from 70 N/m² to 130 N/m². The volume of the liquid changes by 0.15 percent.

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Q. What is the variation of cp, cv and k in case of gases when the temperature increases?

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Q. Calculate the magnitude of capillary effect in millimeters in a glass tube of 7mm diameter, when immersed in mercury. The temperature of the liquid is 25℃ and the values of surface tension of mercury at 25℃ is 0.51 N/m. The angle of contact for mercury is 130°.

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