If orange is called butter, butter is called soap, soap is called ink, ink is called honey and honey is called orange, Which of the following is used for washing clothes?
(A) Honey
(B) Butter
(C) Orange
(D) Ink
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Air is pushed into a soap , bubble of radius r to double its radius. If the surface tension of the soap solution is S,
The correct answer is (d) 24πr2S. Explanation: The surface tension S is equal to surface energy per unit area, S = U/A →U = SA The total area of the soap bubble =2*4πr² =8πr² The...
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The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble.
The correct answer is (d) 0125. Explanation: Let the radius of the first soap bubble = r, Excess pressure inside P = 4S/r Let the radius of the second soap bubble = r' Excess pressure...
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For which one of the following is capillarity not the reason? (a) Blotting of ink (b) Rising of underground water
(b) Capillary action, or capillarity, is a phenomenon where liquid spontaneously rises in a narrow space such as a thin tube, or in porous materials such as paper or in...
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Which of the following types of light are strongly absorbed by plants? (a) Violet and orange (b) Blue and red (c) Indigo and yellow
(b) Photosynthesis occurs between wavelengths of about 400 nm and 750 nm. Red and blue colour wavelength is categories in this wavelength. So, plants absorb these colours. Photosynthesis does not...
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Three persons A, B and C wore shirts of black, blue and orange colours (not necessarily in that order) and pants of green,
(b) Persons Shirt Pant Black Blue Orange Green Yellow Orange A X ✓ X ✓ B ✓ X ✓ C ✓ X ✓ Colour of C’s Pant-Green and Colour of C’s Shirt-Blue
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If acidified potassium dichromate (VI) acts as oxidizing agent, color changes from a) orange to red b) orange to green
b) orange to green
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Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red.
Solution Y is a stronger acid.
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Rahul has been stung by a honey bee and is in great pain. What could be the reason for this burning pain ?
(i) Bee-sting injects methanoic acid. (ii) A mild base like baking soda will give relief.
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At high concentration of soap in water, soap behaves as ____________.
(ii) associated colloid
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Which of the following phenomenon occurs when a chalk stick is dipped in ink? (i) adsorption of coloured substance
(i), (iv) (i) adsorption of coloured substance (iv) absoprtion of solvent
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