HSEB Exam Questions

260. From what height a block of ice is dropped in order that it may completely melt. It is assumed that 20% of energy of fall is retained by ice. [168000m] Hints: Actually the ice doesn’t melt completely when it is dropped from any height. But just in the view of examination, take 20% PE = mL and determine height.261. Find the rms speed of Nitrogen...

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Hygrometry

228. If the temperature of air is 16.5 0C and dew point is 6.5 0C , find the relative humidity of air. ( SVP at 6, 7 , 16 and 17 0C are 7.05, 7.51, 13.62 and 14.42 mm of Hg respectively ) [ 51.9%]229. What is the dew point on a day if the humidity is 40% on that day when the temperature is 300 C.[12 0C ]230. On a certain day the dew point is 8.5 0C...

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Temperature

189. At what temperature degree Fahrenheit scale shows twice the reading of degree centigrade? [ 160 0C] Hints: The relation between C and F scale of temperature is . Take C = , then F = 2.190. At what temperature degree Fahrenheit scale shows half of the reading of degree centigrade? [ – 24.62 0C] Hints: Take C = , then F will be /2 and put the...

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Revision for ambitious students

132. A body moving through air at high speed ‘v’ experiences a retarding force given by f = k A  vx, where A is the surface area of the body,  is density of air and k is dimensionless constant. Deduce the expression.133. The position of a particle moving along on X – axis is given by x = A t2 + Bt + C. The numerical value of A, B and C are 1, -4,...

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