Description : The density of a gas is maximum at – (1) Low temperature, low pressure (2) Low temperature, high pressure (3) High temperature, low pressure (4) High temperature, high pressure
Last Answer : (2) Low temperature, high pressure Explanation: The density of gases depends upon the temperature. The higher the temperature, the more the molecules are spread out and the lower the density. The result is that warm gases rise and cool gases sink.
Description : Clouds float in the atmosphere because of their – (1) low pressure (2) low density (3) low viscosity (4) low temperature
Last Answer : (2) low density Explanation: The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water ... it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
Description : The clouds float in the atmosphere because of their low: (1) temperature (2) velocity (3) pressure (4) density
Last Answer : (4) density Explanation: Clouds generally form, survive and grow in air that is moving upward. Rising air expands as the pressure on it decreases, and that expansion into thinner, high-altitude air causes cooling.
Description : Clouds float in the atmosphere because of their (1) low pressure (2) low density (3) low viscosity (4) low temperature
Last Answer : low density
Description : Pressure of gas depends on the A. density of gas B. mean square speed of gas molecules C. both A and B D. temperature
Last Answer : both A and B
Description : A real gas can act as an ideal gas in - (1) high pressure and low temperature (2) low pressure and high temperature (3) high pressure and high temperature (4) low pressure and low temperature
Last Answer : (2) low pressure and high temperature Explanation: Real gases approximate ideal gases when their pressure is relatively low, and their temperature reasonably high. A real gas deviates increasingly from ideality as it is compressed and cooled to near the point at which it will condense into a liquid.
Description : Which set of conditions represents the easiest way to liquiify a gas? (1) Low temperature and high pressure (2) High temperature and low pressure (3) Low temperat.ure and low pressure (4) High temperature and high pressure
Last Answer : (1) Low temperature and high pressure Explanation: Low temperature and high pressure set of conditions represents the easiest way to liquefy a gas. Liquefaction of gases is physical conversion of a ... pressure by simple cooling; a few, such as carbon dioxide, require pressurization as well.
Description : Gases deviate from gas laws at A. high temperature only B. low pressure only C. high pressure and low temperature D. low temperature only
Last Answer : high pressure and low temperature
Description : Under which of the following conditions does the behavior of a real gas resemble that of an ideal gas? Is it: w) under all conditions of temperature and pressure x) only at very high pressure ... when the gas is near condensation z) only at low densities when the molecules are relatively far apart
Last Answer : ANSWER: Z -- ONLY AT LOW DENSITIES WHEN THE MOLECULES ARE RELATIVELY FAR APART
Description : A real gas can act as an ideal gas in (1) high pressure and low temperature (2) low pressure and high temperature (3) high pressure and high temperature (4) low pressure and low temperature
Last Answer : low pressure and high temperature
Description : Which set of conditions represents the easiest way to liquify a gas ? (1) Low temperature and high pressure (2) High temperature and low pressure (3) Low temperature and low pressure (4) High temperature and high pressure
Last Answer : Low temperature and high pressure
Description : Cyclones are caused due to – (1) low pressure (2) high pressure (3) low temperature (4) high density
Last Answer : (1) low pressure Explanation: Cyclones are huge revolving storms caused by winds blowing around a central area of low atmospheric pressure. In the northern hemisphere, cyclones are called hurricanes ... hemisphere, these tropical storms arc known as cyclones, whose winds blow in a clockwise circle.
Description : Cyclones are caused due to (1) low pressure (2) high pressure (3) low temperature (4) high density
Last Answer : low pressure
Description : Equal volumes of different gases at any definite temperature and pressure have- (1) Equal weights (2) equal masses (3) equal density (4) equal no. of molecules
Last Answer : (4) equal no. of molecules
Description : Which one among the following doesn't have any effect on velocity of sound? (1) Pressure (2) Temperature (3) Humidity (4) Density
Last Answer : (3) Humidity Explanation: The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density ... (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
Description : Velocity of sound in air does not depend on – (1) Density of air (2) Temperature of air (3) Pressure of air (4) Humidity of air
Last Answer : (3) Pressure of air Explanation: Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. ... air pressure because the air pressure and air density are proportional to each other at the same temperature.
Description : Boyle's law is a relationship between – (1) Pressure and volume (2) Volume and temperature (3) Volume and density (4) Pressure and temperature
Last Answer : (1) Pressure and volume Explanation: Boyle's law states that the absolute pressure and volume of a given mass of confined gas are inversely proportional, if the temperature remains unchanged within a ... law was named after chemist and physicist Robert Boyle, who published the original law in 1662.
Description : The different colours of different stars are due to the variation of – (1) temperature (2) pressure (3) density (4) radiation from them
Last Answer : (1) temperature Explanation: Shortly after blackbody radiation was understood, it was noticed that the spectra of stars look extremely similar to blackbody radiation curves of various temperatures, ... and that the colour variation of stars is a direct consequence of their surface temperatures.
Description : Which one among the following doesn't have any effect on velocity of sound ? (1) Pressure (2) Temperature (3) Humidity (4) Density
Last Answer : Humidity
Description : Velocity of sound in air does not depend on (1) Density of air (2) Temperature of air (3) Pressure of air (4) Humidity of air
Last Answer : Pressure of air
Description : Boyle’s law is a relationship between (1) Pressure and volume (2) Volume and temperature (3) Volume and density (4) Pressure and temperature
Last Answer : Pressure and volume
Description : The different colours of different stars are due to the variation of (1) temperature (2) pressure (3) density (4) radiation from them
Last Answer : temperature
Description : The amount of heat required to change a boiling liquid to a gas at the same temperature depends on one of the following properties of the liquid. Does it depend on the liquid's: w) heat of fusion x) heat of vaporization y) temperature z) density
Last Answer : ANSWER: X -- HEAT OF VAPORIZATION
Description : A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the ... Are they w) electrons x) protons y) negatively charged neon ions z) positively charged neon ions
Last Answer : ANSWER: Z -- POSITIVELY CHARGED NEON IONS
Description : The temperature of boiling water in a steam engine may be high because - (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the lire is at very high temperature
Last Answer : (3) there is high pressure inside the boiler Explanation: In the boiler of a steam engine, there is a firebox where coal is shoveled into. The coal is kept burning at a very high temperature, and ... reservoir; the steam is then controlled by a slide valve to move into a cylinder to push the piston.
Description : The boiling point of water decreases at higher altitudes is due to – (1) low temperature (2) low atmospheric pressure (3) high temperature (4) high atmospheric pressure
Last Answer : (2) low atmospheric pressure Explanation: At higher altitudes, the air pressure is decreased, which forces water's boiling point to lower. The air pressure decreases with altitude because of the ... of air. The lowered boiling point of water requires an increase in cooking times or temperature.
Description : Cryogenic is a science deals with - (1) High Temperatures (2) Low Pressure (3) High Pressure (4) Low Temperature
Last Answer : (4) Low Temperature Explanation: Cryogenics is the branch of physics that deals with the production and effects of very low temperatures.
Description : Why is it difficult to breathe at higher altitudes? (1) Due to low air pressure (2) Due to low temperature (3) Due to ozone (4) Due to high humidity
Last Answer : (1) Due to low air pressure Explanation: Low air pressure is usually the most significant limiting factor in high mountain regions. The percentage of oxygen in the air at 3.2 km is ... high altitudes, the lower air pressure makes it more difficult for oxygen to enter our vascular systems.
Description : The boiling point of water decreases at higher altitudes is due to (1) low temperature (2) low atmospheric pressure (3) high temprature (4) high atmospheric pressure
Last Answer : low atmospheric pressure
Description : The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature
Last Answer : there is high pressure inside the boiler
Last Answer : Due to low air pressure
Description : If average kinetic energy of molecules is higher, then temperature of gas is A. high B. low C. zero D. infinite
Last Answer : high
Description : Thermal conductivity of a gas at low density, __________ with increase in temperature. (A) Decreases (B) Increases (C) Remains unchanged (D) May increase or decrease; depends on the gas
Last Answer : (B) Increases
Description : Water is used in car radiator because of its – (1) low density (2) easy availability (3) high specific heat capacity (4) low boiling point
Last Answer : (3) high specific heat capacity Explanation: Water is used in car radiators because the Specific heat capacity of water is high as a result of which it takes away the heat from engine better compared to ... coolant used in the radiator. If the radiator was to overheat the car would come to a stop.
Description : Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity
Last Answer : ANSWER: Y -- HIGH MELTING POINT
Description : Water is used in car radiator because of its (1) low density (2) easy availability (3) high specific heat capacity (4) low boiling point
Last Answer : high specific heat capacity
Description : Which of the following set of conditions is favourable for the maximum yield of ammonia by Haber's process? (A) High pressure, low reactants concentration, high temperature (B) High ... , high reactants concentration, low temperature (D) Low pressure, high reactants concentration, low temperature
Last Answer : (C) High pressure, high reactants concentration, low temperature
Description : Pick up the correct statement from the following: (A) A maximum value of dry density is obtained at optimum water content (B) At low value of water content most soils tend to be stiff (C) At high water content, the dry density decreases with an increase of water content (D) All the above
Last Answer : Answer: Option D
Description : If density of a gas is measured at constant temperature and pressure then which of the following statement is correct ?
Last Answer : If density of a gas is measured at constant temperature and pressure then which of the following ... d. All the above statements are correct.
Description : The speed of sound in an ideal gas varies as the (A) Temperature (B) Pressure (C) Density (D) None of these
Last Answer : (A) Temperature
Description : Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is (A) Inversely proportional to ... the gas (C) Proportional to the pressure of the gas (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : The molecular number density of an ideal gas at standard temperature and pressure in cm3 a. Froude number b. Loschmidt number c. Mach number d. Reynold number
Last Answer : Loschmidt number
Description : Which of the following cannot be a property of a gas? a. density b. pressure c. viscosity d. temperature
Last Answer : viscosity
Description : In the stratosphere, why does temperature increase with increasing height? (a) Conduction. (b) Convection. (c) Greater absorption of ultraviolet radiation at the top of the strato- sphere. (d ... you go up through the strato- sphere, thus the ideal gas law requires temperature to increase too.
Last Answer : Greater absorption of ultraviolet radiation at the top of the strato- sphere.
Description : Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively. (A) 200°C and 5 atm (B) 1000°C and 10 atm (C) 500°C and 50 atm (D) 1000°C and 500 atm
Last Answer : (B) 1000°C and 10 atm
Description : Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature (A) Rate of reaction is very low ... (C) Space velocity of gas is very low resulting in decreased conversion (D) None of these
Last Answer : (A) Rate of reaction is very low
Description : When a gas is expanded from high pressure region to low pressure region; temperature change occurs". This phenomenon is related to the (A) Gibbs-Duhem equation (B) Gibbs-Helmholtz equation (C) Third law of thermodynamics (D) Joule-Thomson effect
Last Answer : (D) Joule-Thomson effect
Description : A gas shows deviation from ideal behaviour at (A) Low pressure and high temperature (B) Low pressure and low temperature (C) Low temperature and high pressure (D) High temperature and high pressure
Last Answer : (C) Low temperature and high pressure
Description : Fugacity and pressure are numerically equal, when the gas is (A) In standard state (B) At high pressure (C) At low temperature (D) In ideal state
Last Answer : (D) In ideal state
Description : Plasma is (A) A high temperature neutral gas (B) Nothing but ionised gas (C) A source of steady and highest controllable pressure (D) Formed at very low temperature
Last Answer : (B) Nothing but ionised gas