Vinaya while playing in garden observed a pond with a green coloured covering which was floating on the surface of water? Next day she asked her teacher about the same. What her teacher must have told her?
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Grasshopper A taken `(2)/(3)` rd time in covering the same distance than that of grasshopper B. Grasshopper spent negligible time on the ground while
Maximum range `(theta=45^(@))=(u^(2))/(g)=R`(say) Distance covered is same `U_(A) cos 45^(@)t_(A)=u_(B) cos 45^(@)t` Given `t_(A)=(2)/(3)t_(B)` `(t_(A))/(t_(B))=(2)/(3)t_(B)` `(t_(A))/(t_(B))=(2)/(3)=(u_(B))/(u_(A))=(g^(R)B)^(1//2)/((g^(R)A)^(1//2))` `(R_(A))/(R_(B))=(9)/(4)=2.25`
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Plenty of algal bloom is observed in a pond in your locality. a) Write what has caused this bloom and how does it affect the quality of water. b) Sugg
a) Presence of large amounts of nutrients in water also cause growth of planktonic algae cause algal bloom. It effects on quality of water in many ways. 1) Deterioration of...
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While on a visit to a pond in the city-neighbourhood, the visitors were delighted to find large expanse of water covered with colourful algal mass. (a
(a) As a student biology, do not agree with the delight of the visitors as the colourful algal mass in the pond indicate the excess of nutrients.
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Cu forms coloured salts while Zn forms colourless salts.
Electronic configuration of 29CU is [Ar] 3d10 4s2. while that of Zn is [Ar] 3d104s2. Electronic configuration of Cu in its +1 oxidation state is [Ar] 3d10 while that in +2...
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Number of ways in which 7 green bottles and 8 blue bottles can be arranged in a row if exactly 1 pair of green bottles is side by side, is (Assume all
Correct Answer - C `(c )` First arrange `8` blue alike bottles `to ` number of ways `=1` Now select one gap out of `9` gaps created to put two green...
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In a thin film between two points A and B, eight fringes are observed with light of wavelength 5461 Å. How many fringes will be observed between the s
Correct Answer - 6.72 fringes
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While rotating an object or while opening a door or a water tap we apply a force or forces.
1. Opening a door can be done with ease if the force applied is: proportional to the mass of the object far away from the axis of rotation and the direction of...
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Why do cricketers wear helmet and pads while playing? Is it related with physics?
Helmet and pads used by cricketers protects the head, using principles of physics. 1. The framing between the interior of the helmet and pads increases the time over which the impulse...
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Gopi got an injury while playing Kabaddi. It took a long time for blood clotting.
(D) Vitamin K
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The depth of a pond is 10 m. What is the apparent depth for a person looking normally to the water surface?
Given: Real depth of pond, dreal = 10 m, nw = \(\frac{4}{3}\) To find: Apparent depth Formula: n = \(\frac{Real\,depth}{Apparent\,depth}\) Calculation: From formula, ∴ Apparent depth = \(\frac{Real\,depth}{n}\) = \(\frac{10}{(\frac{4}{3})}\) = \(\frac{10\times3}{4}\) = 7.5 m
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