The water in an open pond remains cool even in hot summer because (a) Of continuous evaporation of water (b) Water radiates heat more rapidly than the atmosphere (c) Water absorbs heat less rapidly than the atmosphere (d) Water absorbs heat more rapidly than the atmosphere

The water in an open pond remains cool even in hot summer because (a) Of continuous evaporation of water (b) Water radiates heat more rapidly than the atmosphere (c) Water absorbs heat less rapidly than the atmosphere (d) Water absorbs heat more rapidly than the atmosphere
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The surface of water in a pond remains cool even on a hot day because 1. water evaporates at the surface and evaporation causes cooling 2. the heat absorbed at the surface is transmitted downwards 3. Water in contact with the bottom of the pond becomes cool and rises to the surface due to convection Which of the above statements is/are correct? (a) 1 only (b) 3 only (c) 1 and 3 (d) 1, 2 and 3

Description : The surface of water in a pond remains cool even on a hot day because 1. water evaporates at the surface and evaporation causes cooling 2. the heat absorbed at the surface is transmitted downwards 3. Water in contact with the bottom ... /are correct? (a) 1 only (b) 3 only (c) 1 and 3 (d) 1, 2 and 3

Last Answer : Ans:(a)

Why is the water in an open pond cool even on a hot summer day?

Description : Why is the water in an open pond cool even on a hot summer day?

Last Answer : Answer: As the water evaporates from the open surface of a pond, heat is taken away in the process, leaving the surface cool.

During summer, we feel comfortable under a fan because it (a) throws cool air on us (b) sets the air in motion, thereby increasing the evaporation of sweat (c) produces convection currents (d) produces air which carries heat away from the body

Description : During summer, we feel comfortable under a fan because it (a) throws cool air on us (b) sets the air in motion, thereby increasing the evaporation of sweat (c) produces convection currents (d) produces air which carries heat away from the body

Last Answer : Ans:(b)

What The sun heats the surface of the earth and the earth radiates heat back out into the atmosphere?

Description : What The sun heats the surface of the earth and the earth radiates heat back out into the atmosphere?

Last Answer : Need answer

During hot weather, the fan produces a feeling of comfort. This is because – (1) fan supplies cool air (2) fan cools the air (3) our perspiration evaporates rapidly (4) conductivity of air increases

Description : During hot weather, the fan produces a feeling of comfort. This is because – (1) fan supplies cool air (2) fan cools the air (3) our perspiration evaporates rapidly (4) conductivity of air increases

Last Answer : (3) our perspiration evaporates rapidly Explanation: Fans make the air more comfortable for two reasons: (1) by moving the air, they blow away body heat and evaporate sweat, cooling the body, and (2) they also mix the cooler air near the floor with the warmer air by people's faces.

During hot weather, the fan produces a feeling of comfort. This is because (1) fan supplies cool air (2) fan cools the air (3) our perspiration eva-porates rapidly (4) conductivity of air increases

Description : During hot weather, the fan produces a feeling of comfort. This is because (1) fan supplies cool air (2) fan cools the air (3) our perspiration eva-porates rapidly (4) conductivity of air increases 

Last Answer : our perspiration eva-porates rapidly

Pick up the correct statement from the following: (A) Rivers, lakes, oceans and springs get water from the rains (B) Rain water is obtained by evaporation from rivers, lakes and oceans (C) Water remains in atmosphere as vapours(D) All the above

Description : Pick up the correct statement from the following: (A) Rivers, lakes, oceans and springs get water from the rains (B) Rain water is obtained by evaporation from rivers, lakes and oceans (C) Water remains in atmosphere as vapours (D) All the above

Last Answer : Answer: Option D

Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of theoretical plate calculation for distillation column (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature

Description : Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of ... (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature

Last Answer : (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column

In terms of particles how evaporation causes hot water to cool?

Description : In terms of particles how evaporation causes hot water to cool?

Last Answer : For a molecule of water to change from a liquid to a gas requires it absorb heat, called the heat of vaporization. Evaporation is the conversion from a liquid (water) to a gas (water vapor), so each molecule that evaporates takes the heat of vaporization with it making the remaining water cooler.

Give scientific reasons (in not more than four lines each) for the following: (i) Meat takes longer to cook on the mountains (ii) Water remains cool in earthen pitchers (iii) Ice and salt mixture is used as a freezing agent by manual ice cream makers. (iv) It is not advisable to sleep under trees during the night. (v) Greenhouse operators paint their glass roofs white in summer.

Description : Give scientific reasons (in not more than four lines each) for the following: (i) Meat takes longer to cook on the mountains (ii) Water remains cool in earthen pitchers (iii) Ice and salt ... to sleep under trees during the night. (v) Greenhouse operators paint their glass roofs white in summer.

Last Answer : (i) Meat takes longer to cook on the mountains: The atmospheric pressure decreases as the altitude increases. The boiling point of water is 100 c at standard atmospheric pressure. At the mountains this ... of light to a maximum. And therefore white colour is painted on the roofs in the summer.

Airmass near to the earth's surface is warmer because it – (1) radiates heat (2) contains dust particles (3) is warmed by terrestrial radiation (4) is far from the sun

Description : Airmass near to the earth's surface is warmer because it – (1) radiates heat (2) contains dust particles (3) is warmed by terrestrial radiation (4) is far from the sun

Last Answer : (3) is warmed by terrestrial radiation Explanation: The air close to the ground is warmer because the earth's surface is what heats the atmosphere, for the most part. Terrestrial radiation accounts for ... Earth's surface. The further away from the earth's surface we go, the cooler the atmosphere.

Airmass near to the earth’s surface is warmer because it (1) radiates heat (2) contains dust particles (3) is warmed by terrestrial radiation (4) is far from the sun

Description : Airmass near to the earth’s surface is warmer because it (1) radiates heat (2) contains dust particles (3) is warmed by terrestrial radiation (4) is far from the sun

Last Answer : is warmed by terrestrial radiation

Higher concentration of CO2 in atmosphere (A) Allows visible solar radiation (ultraviolet) of short wave-length to pass through (B) Reflects and absorbs the longer wavelength (infra-red) radiations (C) Prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming (D) All (A), (B) and (C)

Description : Higher concentration of CO2 in atmosphere (A) Allows visible solar radiation (ultraviolet) of short wave-length to pass through (B) Reflects and absorbs the longer wavelength (infra-red) radiations (C) Prevents solar heat being ... in 'heat trap' i.e., global warming (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Pick up the correct statement from the following: (A) Phytoplankton contains photosynthetically active pigment (B) An increase of phytoplankton increases the back scattering in the green region (C) An increase of phytoplankton absorbs the bule region rapidly (D) An increase of phytoplankton decreases the back scattering in the green region

Description : Pick up the correct statement from the following: (A) Phytoplankton contains photosynthetically active pigment (B) An increase of phytoplankton increases the back scattering in the green region ( ... rapidly (D) An increase of phytoplankton decreases the back scattering in the green region

Last Answer : Answer: Option D

The increasing amount of CO2 in the atmosphere is slowly raising its temperature because it absorbs (a) the infrared part of the solar radiation (b) the ultraviolet part of the solar radiation (c) all the solar radiations (d) the water vapour of the air

Description : The increasing amount of CO2 in the atmosphere is slowly raising its temperature because it absorbs (a) the infrared part of the solar radiation (b) the ultraviolet part of the solar radiation (c) all the solar radiations (d) the water vapour of the air

Last Answer : Ans:(a)

A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. (A) Hydrogen (B) Carbon dioxide (C) Ozone (D) None of these

Description : A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. (A) Hydrogen (B) Carbon dioxide (C) Ozone (D) None of these

Last Answer : (C) Ozone

What is A device that absorbs and draws heat from a hot object dispersing it into the surroundings is which one of the following?

Description : What is A device that absorbs and draws heat from a hot object dispersing it into the surroundings is which one of the following?

Last Answer : Need answer

The rapidly growing mass of phytoplankton coveting the surface water of a lake or pond is known as – (1) Eutrophication (2) Water bloom (3) Water pollution (4) Water hyacinth

Description : The rapidly growing mass of phytoplankton coveting the surface water of a lake or pond is known as – (1) Eutrophication (2) Water bloom (3) Water pollution (4) Water hyacinth

Last Answer : (1) Eutrophication Explanation: Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage, to an aquatic ... increase of phytoplankton in a water body as a response to increased levels of nutrients.

The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as?

Description : The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as?

Last Answer : Eutriphication.

The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as : (1) Eutrophication (2) Water bloom (3) Water pollution (4) Water hyacinth

Description : The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as : (1) Eutrophication (2) Water bloom (3) Water pollution (4) Water hyacinth

Last Answer : Eutrophication

It is a very hot day. You are in a special kitchen, in that there are no exits and the walls of this kitchen are thermally very well insulated. If you open the refrigerator door, the room will eventually: w) cool off. x) remain the same. y) heat up.

Description : It is a very hot day. You are in a special kitchen, in that there are no exits and the walls of this kitchen are thermally very well insulated. If you open the refrigerator door, the room will eventually: w) cool off. x) remain the same. y) heat up.

Last Answer : ANSWER: Y -- HEAT UP.

Give reason: a) Soda bottles are often labelled “store in cool and dry place”. b) Balloons pops out during hot summer more frequently than in winter. c) During winter football filled with air reduces to its original size when taken outdoors.

Description : Give reason: a) Soda bottles are often labelled “store in cool and dry place”. b) Balloons pops out during hot summer more frequently than in winter. c) During winter football filled with air reduces to its original size when taken outdoors.

Last Answer : a) Soda bottles are often labelled store in cool and dry place . The carbon dioxide filled in soda bottles on exposure to heat, expands because the gas inside the bottle expands as temperature ... . When football is taken out, its temperature decreases so the volume to gas filled also decreases.

In summer, man with excess perspiration feels weak, because of the (a) Loss of more water through evaporation (b) Loss of salts through evaporation (c) Loss of carbohydrates through evaporation (d) All factors mentioned above

Description : In summer, man with excess perspiration feels weak, because of the (a) Loss of more water through evaporation (b) Loss of salts through evaporation (c) Loss of carbohydrates through evaporation (d) All factors mentioned above

Last Answer : Ans:(d)

even cold air radiates?

Description : even cold air radiates?

Last Answer : Heat

An iron hammer, lying in the sun, appears much hotter than its wooden handle because (a) iron is at a higher temperature (b) iron is darker than wood (c) iron absorbs more heat (d) iron is a good conductor of heat

Description : An iron hammer, lying in the sun, appears much hotter than its wooden handle because (a) iron is at a higher temperature (b) iron is darker than wood (c) iron absorbs more heat (d) iron is a good conductor of heat

Last Answer : Ans:(d)

When shopping for bed linens, how do you select sheets that feel "cool" on those hot summer nights?

Description : When shopping for bed linens, how do you select sheets that feel "cool" on those hot summer nights?

Last Answer : I think that just regular cotton is the best. It’s the lightest of the fabric that are used for sheets I think (someone can correct me if I am wrong). And just use two sheets instead of a blanket.

Where would you go to cool down if you were at a foreign city without money to spend in fancy venues, in a totally burning hot summer day?

Description : Where would you go to cool down if you were at a foreign city without money to spend in fancy venues, in a totally burning hot summer day?

Last Answer : Splashing her feet in a fountain…....sitting in the cool dark of a cathedral…..

The Savannah finds its ideal conditions of growth in: (1) mild and humid climate (2) dry summer and wet winter climate (3) hot humid climate with long dry season (4) hot summer and cool winter climate

Description : The Savannah finds its ideal conditions of growth in: (1) mild and humid climate (2) dry summer and wet winter climate (3) hot humid climate with long dry season (4) hot summer and cool winter climate

Last Answer : (3) hot humid climate with long dry season Explanation: Savanna formations find a favourable growth in form of a hot sub-humid tropical climate, a dry season and a rainy season, with an ... either side of the equator on the edges of tropical rainforests. Savannas have warm temperature year round.

The Savannah finds its ideal conditions of growth in : (1) mild and humid climate (2) dry summer and wet winter climate (3) hot humid climate with long dry season (4) hot summer and cool winter climate

Description : The Savannah finds its ideal conditions of growth in : (1) mild and humid climate (2) dry summer and wet winter climate (3) hot humid climate with long dry season (4) hot summer and cool winter climate

Last Answer : hot humid climate with long dry season

Heat that radiates back from greenhouse gases (green house flux) causes

Description : Heat that radiates back from greenhouse gases (green house flux) causes

Last Answer : Heat that radiates back from greenhouse gases (green house flux) causes A. Addition global warming B. Thermal inversion C. Eutrophication D. Smog

Any energy which radiates in the form of radio waves, infrared waves, light waves, x-rays, etc. A. Radiant energy B. Electromagnetic C. Heat D. Ultraviolet

Description : Any energy which radiates in the form of radio waves, infrared waves, light waves, x-rays, etc. A. Radiant energy B. Electromagnetic C. Heat D. Ultraviolet

Last Answer : B. Electromagnetic

The temperature of water at the bottom of a large waterfall is higher than that of the water at the top, because – (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has greater potential energy. (3) the kinetic energy of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.

Description : The temperature of water at the bottom of a large waterfall is higher than that of the water at the top, because - (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has ... of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.

Last Answer : (3) the kinetic energy of the falling water is converted into heat. Explanation: The water gains kinetic energy as it falls down and loses its potential energy. Assuming no other losses, part of the kinetic energy gain of water is converted into heat, raising the temperature of water.

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 temperature (3) the pumping process causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment

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

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 temperature (3) the pumping process causes friction which warms up the water (4) inside water comes out and absorbs heat from the environment

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

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 temperature (3) The pumping process causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

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.

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 temperature (3) The pumping process causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

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.

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 temperature (3) The pumping process causes friction which warms up the water (4) Inside water comes out and absorbs heat from the environment

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 : The temperature inside the earth is higher than the atmospheric temperature

The temperature of water at the bottom of a large waterfall is higher than that of the water at the top. because (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has greater potential energy. (3) the kinetic energy of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.

Description : The temperature of water at the bottom of a large waterfall is higher than that of the water at the top. because (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has greater ... of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.

Last Answer : the kinetic energy of the falling water is converted into heat.

By which of the following methods could a cup of hot coffee lose heat if placed on a metal table in a room? (a) Conduction and radiation (b) Conduction and convection (c) Convection and radiation (d) Conduction, convection, radiation and evaporation

Description : By which of the following methods could a cup of hot coffee lose heat if placed on a metal table in a room? (a) Conduction and radiation (b) Conduction and convection (c) Convection and radiation (d) Conduction, convection, radiation and evaporation

Last Answer : Ans:(d)

Leidenfrost point is a term concerned with the (A) Condensation of the saturated vapor on a cold surface (B) Concentration of a corrosive solution by evaporation (C) Heat transfer between two highly viscous liquids (D) Boiling of a liquid on a hot surface

Description : Leidenfrost point is a term concerned with the (A) Condensation of the saturated vapor on a cold surface (B) Concentration of a corrosive solution by evaporation (C) Heat transfer between two highly viscous liquids (D) Boiling of a liquid on a hot surface

Last Answer : (D) Boiling of a liquid on a hot surface

A hot body will radiate heat most rapidly, if its surface is (A) White & rough (B) Black & rough (C) White & polished (D) Black & polished

Description : A hot body will radiate heat most rapidly, if its surface is (A) White & rough (B) Black & rough (C) White & polished (D) Black & polished

Last Answer : (B) Black & rough

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by (A) Solvent extraction (B) Continuous distillation (C) Evaporation (D) Absorption

Description : Acetic acid will be most economically separated from a dilute solution of acetic acid in water by (A) Solvent extraction (B) Continuous distillation (C) Evaporation (D) Absorption

Last Answer : (A) Solvent extraction

Swenson-Walker crystalliser is a __________ unit. (A) Continuous (B) Batch (C) Semi-batch (D) Cooling (adiabatic)-cum-evaporation

Description : Swenson-Walker crystalliser is a __________ unit. (A) Continuous (B) Batch (C) Semi-batch (D) Cooling (adiabatic)-cum-evaporation

Last Answer : (A) Continuous

Wollen clothes keep the body warm because – (1) Wool increases the temperature of the body (2) Wool is a had conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects

Description : Wollen clothes keep the body warm because – (1) Wool increases the temperature of the body (2) Wool is a had conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects

Last Answer : (2) Wool is a had conductor Explanation: It is just because woolen clothes have fibres and between those fibres air is trapped which reduces heat loss. Air reduces heat loss because it is an ... have a greater bulk than other textiles, and retain air, which causes the product to retain heat.

Wollen clothes keep the body warm because – (1) Wool increases the temperature of the body (2) Wool is a had conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects

Description : Wollen clothes keep the body warm because – (1) Wool increases the temperature of the body (2) Wool is a had conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects

Last Answer : (2) Wool is a had conductor Explanation: It is just because woolen clothes have fibres and between those fibres air is trapped which reduces heat loss. Air reduces heat loss because it is an ... have a greater bulk than other textiles, and retain air, which causes the product to retain heat.

Wollen clothes keep the body warm because (1) Wool increases the temperature of the body (2) Wool is a bad conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects

Description : Wollen clothes keep the body warm because (1) Wool increases the temperature of the body (2) Wool is a bad conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects 

Last Answer :  Wool is a bad conductor

What are built to cool down the cooling water in a power plant 1 Towers 2 Cooling pond 3 Air filter 4 non of these

Description : What are built to cool down the cooling water in a power plant 1 Towers 2 Cooling pond 3 Air filter 4 non of these

Last Answer : 1 Towers

The plant which absorbs ammonia di- rectly from the atmosphere?

Description : The plant which absorbs ammonia di- rectly from the atmosphere?

Last Answer : Paddy

Which element in the atmosphere absorbs ultraviolet rays ?

Description : Which element in the atmosphere absorbs ultraviolet rays ?

Last Answer : Ozone in the atmosphere absorbs ultraviolet rays.

The process by which a substance absorbs moisture upon exposure to the atmosphere is called: w) efflorescence x) deliquescence y) dehydrogenation z) desalination

Description : The process by which a substance absorbs moisture upon exposure to the atmosphere is called: w) efflorescence x) deliquescence y) dehydrogenation z) desalination 

Last Answer : ANSWER: X -- DELIQUESCENCE