Please select a subject first
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Would you cool a bucket of water more quickly by placing it on ice or by placing ice in it? Give reasons for your answer.
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Which produces more severe burns : boiling water or steam ? Why ?
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Define the following terms Condensation
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Define the following term Freezing.
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Why does all the water of the earth not get evaporated during hot summer days ?
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If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool ?
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How does the water kept in an earthen pot (matka) become cold during summer ?
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What type of clothes should we wear in summer ? Why ?
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Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
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Why does our palm feel cold when we put some acetone (or perfume) on it ?
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How will you demonstrate that water vapour is present in air ?
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How can the evaporation of a liquid be made faster ?
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What is evaporation ? State the various factors which affect evaporation.
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Why does evaporation cool a liquid ?
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Which of the following are also considered to be the states of matter ?
- Plasma
- Platelets
- BEC
- BHC
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During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :
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The evaporation of water increases under the following conditions :
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Give four important functions of epithelial tissue. Name one specific place in the body where each function is carried out.
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List One Function of the Following:
Goblet Cell
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The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.
- Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
- Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
- Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
- Name the most common substance belonging to state A.
- Which state of matter makes the sun and other stars to glow ?
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