KVPY Stream SBSX (Class 12 & 1st Year B.Sc.) Physics: Questions 90  92 of 268
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Question number: 90
» Thermodynamics » Measurement of Temperature
Appeared in Year: 2014
Question
Consider two thermometers T_{1} and T_{2} of equal length which can be used to measure temperature over the range θ_{1} to θ_{2}. T_{1} contains mercury as the thermometric liquid while T_{2} contains bromine. The volumes of the two liquids are the same at the temperature θ_{1}. The volumetric coefficients of expansion of mercury and bromine are 18 × 10^{–5} K^{–1} and 108 × 10^{–5} K^{–1}, respectively. The increase in length of each liquid is the same for the same increase in temperature. If the diameters of the capillary tubes of the two thermometers are d_{1} and d_{2} respectively, then the ratio d_{1}: d_{2} would be closest to –
Choices
Choice (4)  Response  

a.  0.4 

b.  2.5 

c.  6.0 

d.  0.6 

Question number: 91
» Thermodynamics » Thermal Equilibrium
Appeared in Year: 2014
Question
An ideal gas follows a process described by from (P_{1}, V_{1}, T_{1}) to (P_{2}, V_{2}, T_{2}) (C is a constant). Then –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 92
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Appeared in Year: 2013
Question
YoungLaplace law states that the excess pressure inside a soap bubble of radius R is given by where σ is the coefficient of surface tension of the soap. The Eӧtvӧs number E_{0} is a dimensionless number that is used to describe the shape of bubbles rising through a surrounding fluid. It is a combination of g (the acceleration due to gravity), ρ (the density of the surrounding fluid), σ and a characteristic length scale L which could be the radius of the bubble. A possible expression for E_{0} is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

