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

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
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(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.
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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

A fan produces a feeling of comfort during hot weather. Why?

Description : A fan produces a feeling of comfort during hot weather. Why?

Last Answer : – Our perspiration evaporates rapidly

A fan produces a feeling of comfort during hot weather. Why? -Do You Know?

Description : A fan produces a feeling of comfort during hot weather. Why? -Do You Know?

Last Answer : answer:

A fan produces a feeling of comfort during hot weather. Why?

Description : A fan produces a feeling of comfort during hot weather. Why?

Last Answer : Our perspiration evaporates rapidly

We feel cool when we sit near the fan, this is because – (1) fan gives cool air. (2) an cools surrounding air. (3) air vapourises the sweat on our body. (4) we feel cool when air touches the body.

Description : We feel cool when we sit near the fan, this is because – (1) fan gives cool air. (2) an cools surrounding air. (3) air vapourises the sweat on our body. (4) we feel cool when air touches the body.

Last Answer : (3) air vapourises the sweat on our body. Explanation: We feel comfortable sitting under a fan when we are perspiring because a fan increases the rate of evaporation of sweat (or moisture) from our body and makes us feel cool and comfortable.

We feel cool when we sit near the fan, this is because (1) fan gives cool air. (2) fan cools surrounding air. (3) air vapourises the sweat on our body. (4) we feel cool when air touches the body.

Description : We feel cool when we sit near the fan, this is because (1) fan gives cool air. (2) fan cools surrounding air. (3) air vapourises the sweat on our body. (4) we feel cool when air touches the body.

Last Answer : air vapourises the sweat on our body.

The basic underlying principle of using a mist propagation system is that it: a. Keeps the propagation medium uniformly moist and supplies moisture to the base of the cuttings b. Keeps the plant material cool c. Cools the propagation medium to promote root formation and development d. Increases humidity around the cutting and reduces transpiration

Description : The basic underlying principle of using a mist propagation system is that it: a. Keeps the propagation medium uniformly moist and supplies moisture to the base of the cuttings b. ... medium to promote root formation and development d. Increases humidity around the cutting and reduces transpiration

Last Answer : Increases humidity around the cutting and reduces transpiration

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

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.

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

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 : The liquid boils

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)

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)

When hot-water is sprinkled on a hotter glass tumbler, it breaks because – (1) glass suddenly expands (2) glass suddenly contracts (3) water evaporates (4) glass reacts chemically with water

Description : When hot-water is sprinkled on a hotter glass tumbler, it breaks because – (1) glass suddenly expands (2) glass suddenly contracts (3) water evaporates (4) glass reacts chemically with water

Last Answer : (2) glass suddenly contracts Explanation: If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.

When hot-water is sprinkled on a hotter glass tumbler, it breaks because (1) glass suddenly expands (2) glass suddenly contracts (3) water evaporates (4) glass reacts chemically with water

Description : When hot-water is sprinkled on a hotter glass tumbler, it breaks because (1) glass suddenly expands (2) glass suddenly contracts (3) water evaporates (4) glass reacts chemically with water

Last Answer : glass suddenly contracts

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

Description : 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

Last Answer : Ans:(c)

If a crystal cools rapidly it will?

Description : If a crystal cools rapidly it will?

Last Answer : small

Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land? [CSAT 2011] (a) It greatly increases the crop production (b) It makes some soils impermeable (c) It raises the water table (d) It fills the air spaces in the soil with water

Description : Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land? [CSAT 2011] (a) It greatly increases ... c) It raises the water table (d) It fills the air spaces in the soil with water

Last Answer : Ans: (b)

Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land? a. It greatly increases the crop production b. It may lead to crop yield loss c. It raises the water table d. It fills the air spaces in the soil with water

Description : Salinization occurs when the irrigation water accumulated in the soil evaporates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land? a. It greatly increases the crop ... c. It raises the water table d. It fills the air spaces in the soil with water

Last Answer : b. It may lead to crop yield loss

A hot air balloon has a volume of 2800 m^3 at 99°C. What is the volume if the air cools to 80°C?

Description : A hot air balloon has a volume of 2800 m^3 at 99°C. What is the volume if the air cools to 80°C?

Last Answer : A hot air balloon has a volume of 2800 m3 at 99°C. What is the volume if the air cools to 80°C?

When air is warm, it rises and leaves an area of low pressure which becomes filled with sinking cold air. After a hot, sunny day, the land cools faster than the sea. What is likely to happen after a hot, sunny day on the sea shore?

Description : When air is warm, it rises and leaves an area of low pressure which becomes filled with sinking cold air. After a hot, sunny day, the land cools faster than the sea. What is likely to happen after a hot, sunny day on the sea shore?

Last Answer : When air is warm, it rises and leaves an area of low pressure which becomes filled with sinking cold air. After a hot, sunny day, the land cools faster than the sea. What is likely to happen after a hot, sunny day on the sea shore?

The first step in the generation of a sea breeze is . (a) air over land expands and builds a pressure gradient at the surface that pushes air offshore (b) air over land expands and builds a pressure gradient at the surface that pushes air onshore (c) hot air over land rises, cools and forms a cloud (d) air over land expands and builds a pressure gradient aloft that pushes air offshore

Description : The first step in the generation of a sea breeze is . (a) air over land expands and builds a pressure gradient at the surface that pushes air offshore (b) air over land expands and builds ... forms a cloud (d) air over land expands and builds a pressure gradient aloft that pushes air offshore

Last Answer : air over land expands and builds a pressure gradient aloft that pushes air offshore

How to keep a room cool in hot-humid weather without air conditioning (science!)

Description : How to keep a room cool in hot-humid weather without air conditioning (science!)

Last Answer : I keep my windows open and use a fan,blinds lowered.

When does the air cool most rapidly? Is it during w) a cloudy day x) a cloudy night y) a sunny day z) a clear night

Description : When does the air cool most rapidly? Is it during w) a cloudy day x) a cloudy night y) a sunny day z) a clear night

Last Answer : ANSWER: Z -- A CLEAR NIGHT

After long periods of use, a grey spot develops on the inside of a bulb. This is because – (1) the tungsten filament evaporates and collects there (2) the heat of the bulb scorches the glass at the top (3) dust inside the bulb condenses on the top (4) glass undergoes a change due to the heat

Description : After long periods of use, a grey spot develops on the inside of a bulb. This is because – (1) the tungsten filament evaporates and collects there (2) the heat of the bulb scorches the glass at the top (3) dust inside the bulb condenses on the top (4) glass undergoes a change due to the heat

Last Answer : (3) dust inside the bulb condenses on the top Explanation: At high operating temperatures, tungsten evaporates from the filament and gradually forms a gray film on the inside of the bulb. The inert ... spot develops in the filament. When this happens, the filament will break and the bulb fails.

After long periods of use, a grey spot develops on the inside of a bulb. This is because (1) the tungsten filament evaporates and collects there (2) the heat of the bulb scorches the glass at the top (3) dust inside the bulb condenses on the top (4) glass undergoes a change due to the heat

Description : After long periods of use, a grey spot develops on the inside of a bulb. This is because (1) the tungsten filament evaporates and collects there (2) the heat of the bulb scorches the glass at the top (3) dust inside the bulb condenses on the top (4) glass undergoes a change due to the heat

Last Answer : dust inside the bulb condenses on the top

In a cup, tea cools from 90°C to 80°C in exactly one minute. It will cool from 70°C to 60°C in (a) less than one minute (b) exactly one minute (c) nearly one minute (d) more than one minute

Description : In a cup, tea cools from 90°C to 80°C in exactly one minute. It will cool from 70°C to 60°C in (a) less than one minute (b) exactly one minute (c) nearly one minute (d) more than one minute

Last Answer : Ans:(d)

A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes. (A) 10 (B) > 10 (C) < 10 (D) Either (B) or (C), depends on the mass of the body

Description : A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes. (A) 10 (B) > 10 (C) < 10 (D) Either (B) or (C), depends on the mass of the body

Last Answer : (B) > 10

Asthma worse in foggy weather and relieved by profuse perspiration, is seen in Options: 1) Hypericum 2) Lachesis 3) Sambucus 4) Carbo veg.

Description : Asthma worse in foggy weather and relieved by profuse perspiration, is seen in Options: 1) Hypericum 2) Lachesis 3) Sambucus 4) Carbo veg.

Last Answer : Correct Answer: 1) Hypericum

Why is induced draught considered better than the forced draught? a) Because power requirement is high for forced draught b) Maintenance of induced draught fan is costlier c) Forced draught is less efficient d) Forced draught produces less amount of speed of air

Description : Why is induced draught considered better than the forced draught? a) Because power requirement is high for forced draught b) Maintenance of induced draught fan is costlier c) Forced draught is less efficient d) Forced draught produces less amount of speed of air

Last Answer : Because power requirement is high for forced draught

How do camels cool themselves in hot weather?

Description : How do camels cool themselves in hot weather?

Last Answer : A: Camels have several cooling mechanisms to cope with hot weather. They can sweat to dissipate heat, but their long hair often prevents the sweat from evaporating quickly. They also regulate their body temperature by seeking shade, panting, and reducing activity during the hottest parts of the day.

How warm or hot does the weather need to be before wearing Daisy Duke or booty shorts is comfortable and not too cool?

Description : How warm or hot does the weather need to be before wearing Daisy Duke or booty shorts is comfortable and not too cool?

Last Answer : I walk the shores of a huge lake every day. I’ve been seeing long sleeve sweaters with bikini bottoms at the volleyball courts for a week now. It’s topping out at 60 degrees. Direct sunshine feels great, but those girls are nuts.

Can you still use "Ricey Cauliflower" Had streak hot weather, then cool again.

Description : Can you still use "Ricey Cauliflower" Had streak hot weather, then cool again.

Last Answer : Need Answer

How does La-Nina affect the Pacific Ocean? (1) Decreases salinity of ocean (2) Cools downs the temperature of water (3) Maintains stable temperature of water (4) Increases salinity of ocean

Description : How does La-Nina affect the Pacific Ocean? (1) Decreases salinity of ocean (2) Cools downs the temperature of water (3) Maintains stable temperature of water (4) Increases salinity of ocean

Last Answer : (2) Cools downs the temperature of water Explanation: La-Nina is a climate pattern that describes the cooling of surface waters of the Pacific Ocean along the tropical west coast of South America.

Consider the diurnal (daily) cycle of temperature at the surface. Why is the tem- perature maximum in the mid-to-late afternoon? (a) There is a net energy gain at the surface from dawn to mid- afternoon. (b) Clouds form in mid-to-late afternoon, cutting down the solar heating and cooling the surface. (c) The intensity of solar radiation is at a maximum at this time. (d) Late in the day, evaporation from the surface increases and this cools the surface.

Description : Consider the diurnal (daily) cycle of temperature at the surface. Why is the tem- perature maximum in the mid-to-late afternoon? (a) There is a net energy gain at the surface from dawn to mid- ... this time. (d) Late in the day, evaporation from the surface increases and this cools the surface.

Last Answer : There is a net energy gain at the surface from dawn to mid- afternoon.

A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because– (1) Stone is heavier than parachute (2) Special mechanisms are present in parachute (3) A parachute has a larger surface area and air resistance is more (4) None of these

Description : A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because– (1) Stone is heavier than parachute (2) Special mechanisms are present in parachute (3) A parachute has a larger surface area and air resistance is more (4) None of these

Last Answer : (3) A parachute has a larger surface area and air resistance is more Explanation: Gravity is pulling the man down while friction with the air slows him down. With the parachute out it adds more ... his parachute can make his downward speed vary between about 110 mph and 225 mph-using air resistance.

A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because (1) stone is heavier than parachute (2) special mechanisms are present in parachute (3) a parachute has a larger surface area and air resistance is more (4) None of these

Description : A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because (1) stone is heavier than parachute (2) special mechanisms are present in parachute (3) a parachute has a larger surface area and air resistance is more (4) None of these

Last Answer : a parachute has a larger surface area and air resistance is more

Air coolers are more suitable for – (1) hot and humid climate (2) hot and dry climate (3) cool and humid climate (4) cool and dry climate

Description : Air coolers are more suitable for – (1) hot and humid climate (2) hot and dry climate (3) cool and humid climate (4) cool and dry climate

Last Answer : (2) hot and dry climate Explanation: An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry ... liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.

Air coolers are more suitable for (1) hot and humid climate (2) hot and dry climate (3) cool and humid climate (4) cool and dry climate

Description : Air coolers are more suitable for (1) hot and humid climate (2) hot and dry climate (3) cool and humid climate (4) cool and dry climate

Last Answer :  hot and dry climate

Where can one find a portable fan (about 10" or so) that blows either warm or cool air?

Description : Where can one find a portable fan (about 10" or so) that blows either warm or cool air?

Last Answer : Why does it need to blow hot air also if you need it to cool?

When it's hotter than hades, and you don't have air (or your fan doesn't keep you cool), how do you sleep?

Description : When it's hotter than hades, and you don't have air (or your fan doesn't keep you cool), how do you sleep?

Last Answer : answer:Pretty much just like you described. We caved a few years ago and bought the window unit for the bedroom when the thermometer in our room started reading 109+. With the humidity around here, it was ... sheets with a mist of cool water or stick an ice pack in my pillow in the past, though.

Is the liquid propane in a barbecue evaporates away because the user left the valve open a chemical or physical change?

Description : Is the liquid propane in a barbecue evaporates away because the user left the valve open a chemical or physical change?

Last Answer : It's a physical change. Chemically, it's still propane - butit's physically changed from a liquid to a gas.

After long periods of use, a gray spot develops on the inside of a bulb. This is because of: A. The tungsten filament evaporates and collects there B. The heat of the bulb scorches the glass at the top C. Dust inside the bulb condenses on the top D. Glass undergoes a change due to the heat

Description : After long periods of use, a gray spot develops on the inside of a bulb. This is because of: A. The tungsten filament evaporates and collects there B. The heat of the bulb scorches the glass at the top C. Dust inside the bulb condenses on the top D. Glass undergoes a change due to the heat

Last Answer : ANSWER: A

A little ether on the palm gives a cooling sensation because ether (a) is a cold liquid (b) evaporates (c) enters the pores of the skin (d) condenses on the palm

Description : A little ether on the palm gives a cooling sensation because ether (a) is a cold liquid (b) evaporates (c) enters the pores of the skin (d) condenses on the palm

Last Answer : Ans:(b)

Plants are killed in winter by frost because (a) No photosynthesis occurs at low temperature (b) Of desiccation (c) Water in the plants freezes (d) Water in the plants evaporates

Description : Plants are killed in winter by frost because (a) No photosynthesis occurs at low temperature (b) Of desiccation (c) Water in the plants freezes (d) Water in the plants evaporates

Last Answer : Ans:(b)

If electrical conductivity increases with the increase of temperature of a substance, then it is a: (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Description : If electrical conductivity increases with the increase of temperature of a substance, then it is a: (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Last Answer : (2) Semiconductor Explanation: A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects

If electrical conductivity increases with the increase of temperature of a substance, then it is a (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Description : If electrical conductivity increases with the increase of temperature of a substance, then it is a (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Last Answer : (2) Semiconductor Explanation: A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects.

What kind of change is it when water cools to ice ?

Description : What kind of change is it when water cools to ice ?

Last Answer : When water cools, it turns into ice. This is a physical change.

In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres. (A) Polythene (B) PVC (C) Rayon (D) Polyvinyl acetate

Description : In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament ... is used for __________ fibres. (A) Polythene (B) PVC (C) Rayon (D) Polyvinyl acetate

Last Answer : (B) PVC

Feeling the termors of an earthquake a scared resident of seventh floor of a multistoried building starts climbing down the stairs rapidly. Which horm

Description : Feeling the termors of an earthquake a scared resident of seventh floor of a multistoried building starts climbing down the stairs rapidly. Which horm

Last Answer : Feeling the termors of an earthquake a scared resident of seventh floor of a multistoried building ... Gastrin B. Thyroxin C. Adrenaline D. Glucagon

Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoryed building starts climbing down the stairs rapidly. Which hormone initiated this action? (a) Adrenaline (b) Glucagon (c) Gastrin (d) Thyroxine

Description : Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoryed building starts climbing down the stairs rapidly. Which hormone initiated this action? (a) Adrenaline (b) Glucagon (c) Gastrin (d) Thyroxine

Last Answer : (b) embryo sac

Transpiration increases in – (1) Hot, thy and windy condition (2) Hot, damp and windy condition (3) Cool, damp and windy condition (4) Cool, dry and still condition

Description : Transpiration increases in – (1) Hot, thy and windy condition (2) Hot, damp and windy condition (3) Cool, damp and windy condition (4) Cool, dry and still condition

Last Answer : (1) Hot, thy and windy condition