Related Questions

The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
The weight per unit volume of a liquid at a standard temperature and pressure is called
A Specific weight
B Mass density
C Specific gravity
D None of these
স্বাভাবিক তাপমাত্রা ও চাপে একটি গ্যাসের ঘনত্ব 1/3 একক। স্বাভাবিক চাপ P একক হলে অণুগুলোর গড় বর্গবেগের বর্গমূল কত? (Density of a gas at standard temperature and pressure is 1/3 unit. If the standard pressure is P unit, calculate the root-mean-square velocity of the molecules.)
A 3p
B 3P
C 3p
D 3p
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
A,B,C,D,E,G and I are seven friends who study in three different standards namely 5th, 6th and 7th such that not less than two friends study in the same standard. Each friend also has a different favorite subject namely History, Civics, English, Bangla, Science , Maths , and Economics but not necessarily in the same order. A likes Maths and studies in the 5th standard with only one other friend who likes Bangla. I studies with tow other friends . Both the friends who study with I like languages (Here languages include only Science , English and Bangla ) . D studies in the 6th standard with only one person and does not like Civics . E studies with only one friend . The one who likes history does not study in 5th or 6th standard . E does not like languages. C does not like English , Science or Civics. Which combination represents E's favorite subject and the standard in which he studies?
A Civics and 7th
B Economics and 5th
C Civics and 6th
D History and 7th
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
A Thermal resistance
B Thermal coefficient
C Temperature gradient
D Thermal conductivity
A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.
A Subcooled
B Saturated
C Non-solidifiable
D None of these
Total pressure on the vertical face of a retaining wall of height ‘h’ per unit run exerted by the retained earth weighing ‘w’ per unit volume, is
A $${\text{wh}}\frac{{\left( {1 - \sin \varphi } \right)}}{{\left( {1 + \sin \varphi } \right)}}$$
B $${\text{w}}{{\text{h}}^2}\frac{{\left( {1 - \sin \varphi } \right)}}{{\left( {1 + \sin \varphi } \right)}}$$
C $$\frac{{{\text{w}}{{\text{h}}^2}\left( {1 - \sin \varphi } \right)}}{{2\left( {1 + \sin \varphi } \right)}}$$
D $$\frac{{{\text{w}}{{\text{h}}^2}\left( {1 - \sin \varphi } \right)}}{{3\left( {1 + \sin \varphi } \right)}}$$
Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of
A Mixing
B Adsorption
C Wetting
D Complete wetting
The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about __________ times.the design pressure.
A 1.5 to 2
B 3 to 4
C 4 to 5
D >5

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