You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it inspite of being blindfolded?
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In a group of 70 people, 37 like coffee, 52 like tea, and each person likes at least one of the two drinks. How many people like both coffee and tea?
Let C denote the set of people who like coffee, and T denote the set of people who like tea n(C ∪ T) = 70, n(C) = 37, n(T) = 52 We...
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Which one of the plant growth regulators would you use if you are asked to:
(a) Induce rooting in a twig – Auxins (b) Quickly ripen a fruit – Ethylene (c) Delay leaf senescence – Cytokinins (d) Induce growth in axillary buds – Cytokinins (e) ‘Bolt’ a rosette plant...
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You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
On heating the powder, it will char if it is a sugar. Alternatively, the powder may be dissolved in water and checked for its conduction of electricity. If it conducts,...
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You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from
(c) both concave mirror and convex lens.
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To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet
When we breathe out, moist air comes out (along with energy and carbon dioxide) which make the glasses wet (as water vapours get condense on glass).
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You are provided with two identical metal bars. One out of the two is a magnet. Suggest two ways to identify the magnet.
Hint: (1) By suspending the metal bars (2) By attracting iron filings (3) Using another magnet
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In a group of 70 people, 37 like coffee, 52 like tea, and each person likes at least one of the two drinks. How many people like both coffee and tea
Let C denote the set of people who like coffee, and T denote the set of people who like tea n(C ∪ T) = 70, n(C) = 37, n(T) = 52...
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Deepa was asked to identify bottles of acetic acid from a shelf where a number of other labelled bottles were placed. She reads the labels as:
The correct answer is (D) i, iii
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Make groups of four friends. For the experiment you will need 4-5 glasses or bowls or bowls and the things listed in the table.
Things Did it dissolve or not? What happened after Keeping for 2 minutes? 1. Salt Yes Salt and water got mix together completely. 2. Soil No Soil settled down at the bottom of the glass. 3. Chalk powder ...
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Have you ever climbed a tree? How did you feel? Were you scared? Did you ever fall?
Yes, once I climbed a tree. It was a very exciting experience. Though I was not scared at all while climbing but once I climbed up and looked downwards for...
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