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Explain what happens to the level of water when an ice containing an iron ball melts in water?
When an ice cube with a iron ball inside floating on water melts, the level of water will decrease as per Archimedes' Principle
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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(d) starch,is the correct option.
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When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of
(b) carbon dioxide
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A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water.
Hint— No. Bending will be different in different liquids since velocity of light at the interface separating two media depends on the relative refractive index of the medium.
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The number of moles of water belonging in two liter water provided its density is 1gm/cc at 25 degree centigrade is?
Given : The density of water is 1g/cc, so if you do dimensional analysis, you can find that in 1 L of water, there is 55.56 mol. Water density is: 1g/cc 1ml *...
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Based on the information given below classify each of the situations as ‘suffering from water scarcity’ or ‘not suffering from water scarcity’.
(a) Not suffering from water scarcity (b) Suffering from water scarcity (c) Suffering from water scarcity (d) Not suffering from water scarcity
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Explain why pure water has the maximum water potential.
Water potential quantifies the tendency of water to move from one part to the other during various cellular processes. It is denoted by the Greek letter Psi or Ψ. The...
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The two forms of oxygen found in the atmosphere are (a) water and ozone (b) water and oxygen (c) ozone and oxygen (d) water and carbon-dioxide
(c) ozone and oxygen
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Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler
Rainwater contains dissolved salts. This makes it a conducting solution. There are no dissolved salts present in the distilled water. Hence, rainwater can allow electricity to pass through it while...
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Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected
Biological oxygen demand (BOD) is the method of determining the amount of oxygen required by micro-organisms to decompose the waste present in the water supply. If the quantity of organic...
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