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question_answer1) Match the following List A List B (i) Electrostatic force (a) Repulsion of like poles of two magnets (ii) Magnetic force (b) Drawing water from the well (iii) Muscular force (c) Bits of paper attracted to a just used comb
question_answer2) Identify the types of forces in each of the following. (i) Which force always attract objects towards the earth? (ii) An apple is falling from the tree towards the ground. Which type of force is involved here? (iii) Which force makes a charged comb attracts small pieces of paper? (iv) Which type of force is used by a boy to kick a football? (v) Which force makes an iron to be attracted by magnet?
question_answer3) Derive the relation between the S.I and C.GS units of pressure
question_answer4) Express a pressure of \[2\text{ }\times \text{ }{{10}^{5}}\]pascal in units of (i) bar (ii) dyne \[c{{m}^{-2}}\]and (iii) millibar
question_answer5) A book of mass 20 g is placed on a table. Find the thrust exerted by the book on the table. (Take acceleration due to gravity as \[10\text{ }m{{s}^{-2}}\])
question_answer6) The foot of an elephant has an area of\[275\text{ }c{{m}^{2}}\]. If the mass of the elephant is 2200 kg, find the pressure exerted by the elephant on the ground. ( \[g=10m{{s}^{-2}}\]).
question_answer7) A nail has \[2\text{ }c{{m}^{2}}\] at one end \[\frac{1}{100}c{{m}^{2}}\] and at the other end. A force of 1000 g. wt is applied on the first end. Calculate the pressure acting on the wall?
question_answer8) Women generally weight less than men. The footprints of women wearing pointed heels are, however, deeper than those of a man wearing flat shoes. Explain,
question_answer9) The weight of a rider, driving scooter is assumed to be evenly distributed on both the tyres. The area of contact of each type with the ground is \[10\text{ }c{{m}^{2}}\]. If the pressure inside the tyres is 3 bar, find the mass of the rider (\[g\text{ }=\text{ }10\text{ }m{{s}^{-2}}\])
question_answer10) Who exerts more pressure? (a) A girl of 50 kg wearing heels with an area of cross section\[1\text{ }c{{m}^{2}}\]. (b) An elephant of 4000 kg with foot area of each \[250\text{ }c{{m}^{2}}.\]
question_answer11) A cubical block of wood of side 5 cm is placed on a table. Find the thrust by the block wood on the table, if density of wood is \[5\,g\,c{{m}^{-3}}\] and g is \[10m{{s}^{-2}}.\]
question_answer12) Which of the following exerts greater thrust? (a) A spherical object of radius 7 cm and density \[0.21\text{ }g\text{ }c{{m}^{-3}}\]placed on a table (b) A cylindrical object of length 49 cm, radius 7 cm and density \[2.2\text{ }g\text{ }c{{m}^{-3}}\]placed on a table (Acceleration due to gravity is \[9.8\text{ }m{{s}^{-2}}\])
question_answer13) A brick with dimensions of \[20\text{ }cm\text{ }\times \text{ }10\text{ }cm\text{ }\times \text{ }5\text{ }cm\]has a weight 500 g wt. Calculate the pressure exerted by it when it rests on different faces. In which case is the pressure exerted the greatest?
question_answer14) If \[20c{{m}^{3}}\]gas at 1 atm is expanded to \[50c{{m}^{3}}\] at constant T, what is the final pressure?
question_answer15) A sample of a given mass of gas at a constant temperature occupies \[95c{{m}^{3}}\] under a pressure of \[9.962\text{ }\times \text{ 10}W{{m}^{-2}}\]. At the same temperature, what is its volume at a pressure of \[10.13\text{ }\times \text{ }{{10}^{4\text{ }}}N{{m}^{-2}}\]
question_answer16) A gas of volume 100 cc. is kept in a vessel at pressure \[{{10}^{4}}Pa\] maintained at temperature of \[{{24}^{o}}C\]. If now the pressure is increased to \[{{10}^{5}}Pa\], keeping the temperature constant, then find the volume of the gas
question_answer17) A gas occupied a volume of 250 ml at 700 mm Hg pressure and\[{{250}^{o}}C\]. What additional pressure is required to reduce the gas volume to its 4/5th value at the same temperature?
question_answer18) There is a gas in a sphere of radius 2r at a pressure P. If the same amount of gas is present in another sphere of radius r at same temperature, find its pressure:
question_answer19) A certain mass of a dry gas at \[{{26}^{o}}C\] and 760mm pressure has a density of 2.8 gm/cc. What will be its density at \[{{26}^{o}}C\] and 740 mm pressure?
question_answer20) If the pressure of a gas becomes 5 times its original pressure, then the density of the gas changes from d gm/lit to____ gm/lit.
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