MEDIUM
Earn 100

How will you prove that water vapour is present in the air?

Important Questions on Matter in our Surroundings

MEDIUM
Science>Chemistry>Matter in our Surroundings>Evaporation
Read the following and select the correct option.
Statement (a) : When we pour little petrol on our palm, it causes the palm to feel cool.
Reason (b) : Particles of petrol evaporate using the energy from our palm which causes the palm to feel cool. 
EASY
Science>Chemistry>Matter in our Surroundings>Evaporation
The water kept in an earthen pot(matka) become cool during summer by which process?
EASY
Science>Chemistry>Matter in our Surroundings>Evaporation

Let T = Temperature; H = Humidity and v = Wind speed
Which of the following are the best suited conditions for drying up of clothes?

MEDIUM
Science>Chemistry>Matter in our Surroundings>Evaporation

The vapour content in the air is measured using a physical quantity called 

EASY
Science>Chemistry>Matter in our Surroundings>Evaporation
A person takes hot coffee by pouring it into the saucer when he is in a hurry because he knows that:
EASY
Science>Chemistry>Matter in our Surroundings>Evaporation
"Spirit kept in an open watch glass is converted into gaseous state even at room temperature". Explain.
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Science>Chemistry>Matter in our Surroundings>Evaporation

Why does water evaporate faster in a Petri dish than in a test tube?

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Science>Chemistry>Matter in our Surroundings>Evaporation
Is evaporation an endothermic or exothermic process? Give one example to support your answer.
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Science>Chemistry>Matter in our Surroundings>Evaporation

Define:

A. evaporation

B. sublimation

MEDIUM
Science>Chemistry>Matter in our Surroundings>Evaporation
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
HARD
Science>Chemistry>Matter in our Surroundings>Evaporation
Describe the factors which affect evaporation.
MEDIUM
Science>Chemistry>Matter in our Surroundings>Evaporation

Why does our palm feel cold when we put some acetone, ethyl alcohol, petrol or perfume on it?

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Science>Chemistry>Matter in our Surroundings>Evaporation
Why is it that wet clothes dry quickly in the sun than in the shade? 
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Science>Chemistry>Matter in our Surroundings>Evaporation
Why does ethanol evaporate faster than water?
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Science>Chemistry>Matter in our Surroundings>Evaporation

What are the factors which affect the rate of evaporation?

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Science>Chemistry>Matter in our Surroundings>Evaporation
Why does it take longer time for the evaporation process on a rainy day?
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Science>Chemistry>Matter in our Surroundings>Evaporation

Why do we feel cool under a fan when we perspire?

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Science>Chemistry>Matter in our Surroundings>Evaporation
Why do we wear cotton clothes in summer? 
EASY
Science>Chemistry>Matter in our Surroundings>Evaporation

Which of the following conditions will increase the evaporation of water?

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Science>Chemistry>Matter in our Surroundings>Evaporation

During summer months, water kept in an earthen pot becomes cool due to the phenomenon of