Description : What happens to a liquid, when the vapour pressure equals the atmospheric pressure? (1) The liquid cools (2) The liquid boils (3) No change (4) The liquid evaporates
Last Answer : (2) The liquid boils Explanation: Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus ... pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
Last Answer : The liquid boils
Description : What is the atmospheric pressure on the earth's surface ?
Last Answer : Atmospheric pressure on the Earth's surface is about `10 ^ 5N` per square meter
Description : Why does atmospheric pressure decrease when the amount of water vapor in the air increases ?
Last Answer : As water vapor is lighter than air, the pressure in the atmosphere decreases as the amount of water vapor in the air increases. During cooking, water vapor is seen rising upwards. This indicates that ... of air decreases. So as the amount of water vapor in the air increases, the pressure decreases.
Description : What is atmospheric pressure ?
Last Answer : The amount of force applied by the atmosphere per unit area of the earth per unit area for its weight is called atmospheric pressure of that place.
Last Answer : The amount of force applied by the atmosphere per unit area of the earth for its weight per unit area is called atmospheric pressure of that place.
Description : The wall of a dam is broader at the base (1) because streamlining is required (2) to withstand pressure that increases with depth (3) to withstand pressure that increases in a horizontal plane (4) to withstand pressure that is increased with atmospheric pressure
Last Answer : (2) to withstand pressure that increases with depth Explanation: Darns are built broader at the base for two reasons. The first is because it needs to be stable enough to support the dam, and two, ... the structure the lower levels of water are at higher pressure than the upper levels of the water.
Description : At boiling point of liquids, its : (1) Temperature increases (2) Atmospheric pressure increases (3) Timperature remains increases (4) Vapour pressure decreases
Last Answer : (3) Timperature remains increases
Description : In severe winter, in cold countries water pipes burst because – (1) Water expands on freezing (2) Contraction of water pipes (3) High atmospheric pressure (4) Combined effect of all the above three
Last Answer : (1) Water expands on freezing Explanation: Most liquids have a quite simple behavior when they are cooled (at a fixed pressure): they shrink. The liquid contract as it is cooled; ... substance solidifies, which causes it to contract some more because crystalline solids are usually tightly packed.
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 : The colours of stars depend on their – (1) temperature (2) distance (3) radius (4) atmospheric pressure
Last Answer : (1) temperature Explanation: The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase.
Description : The boiling point of water depends upon the – (1) atmospheric pressure (2) volume (3) density (4) mass
Last Answer : (1) atmospheric pressure Explanation: The boiling point corresponds of water to the ternperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on ... pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
Description : Which instrument is used to record Atmospheric pressure? (1) Thermometer (2) Barometer (3) Seismometer (4) Oscilloscope
Last Answer : (2) Barometer Explanation: A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A barometer using mercury is common. This is often recorded as mm Hg.
Description : At boiling point of liquids, its – (1) Temperature increases (2) Atmospheric pressure increases (3) Temperature remains constant (4) Vapour pressure decreases
Last Answer : (3) Temperature remains constant Explanation: An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point.
Description : Water from soil enters into the root hairs owing to : (1) Atmospheric pressure (2) Capillary pressure (3) Root pressure (4) Osmotic pressure
Last Answer : (2) Capillary pressure Explanation: In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, ... the difference in water potential between the soil and the substomatal cavity caused by transpiration.
Description : The sudden fall of atmospheric pressure indicates – (1) fair weather (2) storm (3) rain (4) cold weather
Last Answer : (2) storm Explanation: Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
Description : A storm is predicted if atmospheric pressure – (1) Rises suddenly (2) Rises gradually (3) Falls suddenly (4) Falls gradually
Last Answer : (3) Falls suddenly Explanation: Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the ... reduces the weight of air above the reservoir so the mercury level drops to a lower level.
Description : A falling drop of rain water ac-quires the spherical shape due to – (1) Viscosity (2) Surface Tension (3) Atmospheric pressure (4) Gravitational force
Last Answer : (2) Surface Tension Explanation: Raindrops start out as round high in the atmosphere as water collects on dust and smoke particles in clouds. But as raindrops fall, they lose their rounded ... the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules.
Description : Height of atmosphere, if atmospheric density is 1.29 kg m-3 and atmospheric pressure is 101 kPa, is A. 7839.4 m B. 7829.4 m C. 7849.4 m D. 7859.4 m
Last Answer : 7829.4 m
Description : In a weather map, lines joining all those regions with same atmospheric pressure are called A. Bars B. Millibars C. Isobars D. Atmospheric bars
Last Answer : Isobars
Description : An instrument commonly used for the measurement of atmospheric pressure is known as A. Manometer B. Barometer C. Calorimeter D. Potentiometer
Last Answer : Barometer
Description : A rectangle-shaped open-to-sky tank of water has a length of 2 m and a width of 1 m. If the atmospheric pressure is assumed to be 100 kPa and thickness of the tank walls is assumed to be negligible, the force exerted by ... of water is A. 20 kN B. 50 kN C. 100 kN D. 200 kN
Last Answer : 200 kN
Description : A gas at 0 degrees C and at normal atmospheric pressure has a volume of 273 cubic centimeters. If it is held at constant pressure until its volume is doubled, its temperature will be which one of the ... it be w) 2 degrees Celsius x) 200 degrees Celsius y) 273 degrees Celsius z) 546 degrees Celsius
Last Answer : ANSWER: Y -- 273 DEGREES CELSIUS
Description : The boiling point of water depends upon the (1) atmospheric pressure (2) volume (3) density (4) mass
Last Answer : atmospheric pressure
Description : At boiling point of liquids, its (1) Temperature increases (2) Atmospheric pressure increases (3) Temperature remains constant (4) Vapour pressure decreases
Last Answer : Temperature remains constant
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 colours of stars depend on their (1) temperature (2) distance (3) radius (4) atmospheric pressure
Last Answer : temperature
Last Answer : Capillary pressure
Last Answer : to withstand pressure that increases with depth
Description : A falling drop of rain water acquires the spherical shape due to (1) Viscosity (2) Surface Tension (3) Atmospheric pressure (4) Gravitational force
Last Answer : Surface Tension
Description : In severe winter, in cold countries water pipes burst because (1) water expands on freezing (2) contraction of water pipes (3) high atmospheric pressure (4) combined effect of all the above three
Last Answer : water expands on freezing
Description : A storm is predicted if atmospheric pressure (1) rises suddenly (2) rises gradually (3) falls suddenly (4) falls gradually
Last Answer : falls suddenly
Description : The sudden fall of atmospheric pressure indicates (1) fair weather (2) storm (3) rain (4) cold weather
Last Answer : storm
Description : With suction pressure being atmospheric, increase in delivery pressure with fixed clearance volume A. increase volumetric efficiency B. decrease volumetric efficiency C. does not change volumetric efficiency D. First increase volumetric efficiency and then decrease it
Last Answer : ANSWER : B
Description : In an oil lamp, the oil rises up in the wick due to _____? A. Capillary action B. Atmospheric pressure C. Viscosity of oil D. Change in temperature
Last Answer : ANSWER: A
Description : In an oil lamp, the oil rises up in the wick due to? A. Capillary action (Answer) B. Atmospheric pressure C. Viscosity of oil D. Change in temperature
Last Answer : A. Capillary action (Answer)
Description : Maximum Differential pressure: a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure b. Is the absolute pressure provided by the vacuum ... time limit d. Is the absolute pressure the cabin pressure ducting is designed to carry
Last Answer : a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure
Description : Maximum Differential pressure: a. Is the maximum authorized pressure difference between the inside of the fuselage and the atmospheric ambient pressure b. Is the absolute pressure provided by the ... time limit d. Is the absolute pressure the cabin pressure ducting is designed to carry
Description : The weather office predicts "depression" over a certain area. It means (a) cloudy skies (b) atmospheric pressure in that area is lower than that in the surrounding areas (c) heavy weather causing a feeling of depression (d) low atmospheric pressure over a large area
Last Answer : Ans: (b)
Description : The South-East trade winds are attracted towards the Indian sub-continent in the rainy season due to – (1) the development of cyclone over the equator (2) the effect of easterlies (3) the effect of Northern-East trade winds (4) the presence of low atmospheric pressure over North-West India
Last Answer : (4) the presence of low atmospheric pressure over North-West India Explanation: During the Rainy Season in India (Mid-June to the end of September), the intense heat that prevails in the ... they are deflected to their right and blow over the Indian subcontinent as the south-west monsoon winds.
Description : The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the (A) Solution has ... B) Evaporators operate under vacuum (C) Evaporators operate at atmospheric pressure (D) None of these
Last Answer : (A) Solution has an elevation of boiling point
Description : The South-East trade winds are attracted towards the Indian subcontinent in the rainy season due to (1) the development of cyclone over the equator (2) the effect of easterlies (3) the effect of Northern-East trade winds (4) the presence of low atmospheric pressure over NorthWest India
Last Answer : the presence of low atmospheric pressure over NorthWest India
Description : The variation of atmospheric potential is caused due to: (A) Difference in temperature over the surface of the earth (B) Change in the density of air (C) Both (a) and (b) (D) Neither (a) nor (b)
Last Answer : (C) Both (a) and (b)
Description : The water from a hand pump is warm in winter because - (1) our body is cold in winter and the water appears to be warm (2) the temperature inside the Earth is higher than the atmospheric ... causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment
Last Answer : (2) the temperature inside the Earth is higher than the atmospheric temperature
Description : The water from a hand pump is warm in winter because - (1) Our body is cold in winter and the water appears to be warm (2) The temperature inside the earth is higher than the atmospheric ... causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment
Last Answer : (2) The temperature inside the earth is higher than the atmospheric temperature Explanation: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the ... the outside temperature is higher than the water of the pump, and therefore, it feels cold.
Description : Why are we able to hear short wave broadcasts better than long wave broadcasts? (1) Short waves are more energetic than long waves (2) Short waves are unaffected by atmospheric disturbances ... convention, short waves are meant for long distances, whereas long waves are reserved for short distances
Last Answer : (1) Short waves are more energetic than long waves Explanation: Shortwave radio is used for broadcasting of voice and music, and longdistance communication to ships and aircraft, or to remote areas ... wired communication or other radio services and that's why it is more energetic than long waves.
Description : Which of the following is not caused by atmospheric refraction of light? (1) Sun appearing red at sunset (2) Twinkling of stars at night (3) Sun appearing higher in the sky than it actually is (4) Sun becoming visible two or three minutes before actual sunrise
Last Answer : (3) Sun appearing higher in the sky than it actually is Explanation: The twinkling of stars and variation in size of the Sun are due to atmospheric refraction of light. Besides, refraction is also ... higher or lower in the sky due to the changing position of the Earth relative to the Sun.
Description : Hydroscope is an instrument that shows changes in: (1) Sound under water (2) Atmospheric humidity (3) Density of liquid (4) None of these
Last Answer : (4) None of these Explanation: Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of water by means of a series of mirrors ... usually converted to sound pressure level (SPL), a logarithmic measure of the mean square acoustic pressure.
Description : The 'Greenhouse effect' is mainly due to increase in atmospheric – (1) Ozone (2) Nitrogen (3) Sulphur dioxide (4) Carbon dioxide
Last Answer : (4) Carbon dioxide Explanation: Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change, 72% of the totally emitted greenhouse gases is carbon dioxide (CO2), 18% Methane ... (NOx). Carbon dioxide emissions therefore are the most important ca s e of global warming.