Physics Question Paper Unit Test 3

                          Physics Question Paper Unit Test 3

Time : 90 min                                                                                 M.M = 50

NOTE :

1 =  All question are compulsory .

Q1 =Which is more elastic and why rubber or steel? 

Q2. The meniscus of mercury is convex in shape, why ? 

Q3: State Pascal's law and define terminal velocity. 

Q4 State law of equipartition of energy. Write degree of freedom for a diatomic gas. 

Q5= Show that elastic potential energy per unit volume of a wire is given by U/V = ½ stress x strain. 

Q6:A steel wire of length 4.7 meter and area of cross section 3x10^-5 m so stretches by the same amount as a copper wire of length 3.5 meter and area of cross section 4x 10^-5 m square under a given load .calculate ratio of Young's modulus of steel to that of Young's modulus of copper.

 Q7:How will you show that the effect of gravity on fluid pressure. Calculate the relationship for the pressure. 

Q8:A piece of iron of density 7.8x103 kg m^-3 and volume 10 cm³ is totally immersed in water of density 10³ kg m^-3  Calculate-

 1)weight of iron in air

2)the upthrust and

3)its apparent weight in water. Take g=10 m s^-2

 

Q9: Define Reynolds number, what is the significance of this number? Write its value for streamline, unsteady and turbulent flow of a fluid. 

Q10: Give any three applications of Bernoulli's theorem. 

Q11: Water is flowing through a pipe of area of cross section 9π m² at a speed of 10 ms^-1  if diameter is halved, then find the speed of flow of water through the pipe. 

Q12: Calculate an expression for the excess pressure inside a liquid drop. 

Q13: State three assumptions of kinetic theory of gases, derive an expression for the pressure of an ideal gas also derive gay Lussa's law from it. 

Q14: Prove Bernoulli's theorem for an ideal liquid, define the term gravitational head, velocity hand and pressure head. 

Q15: What is capillarity, derive Ascent formula, show that ϒ=3α where the symbols have their Usual meanings. 

Q16:

a) A 30 gram ice at zero degree centigrade is dropped into 200 gram of H₂O at 30 degree centigrade .Calculate the final temperature of water, when the whole ice is melted .Given specific heat of ice = 1 calorie per gram per degree centigrade and latent heat of ice=80 calorie per gram.

b) Explain stress- strain graph for a material body.

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