Properties of Solids & Liquids [NEST (National Entrance Screening Test-NISER) Physics]: Questions 1 - 3 of 19
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Question 1
Appeared in Year: 2013
Question MCQ▾
Young-Laplace 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 E0 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 E0 is –
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 2
Appeared in Year: 2014
Question MCQ▾
A solid expands upon heating because –
Choices
Choice (4) | Response | |
---|---|---|
a. | The heating generates a thermal gradient between opposite sides. | |
b. | The potential energy of interaction between atoms in the solid is asymmetric about the equilibrium positions of atoms. | |
c. | a fluid called the caloric flows into the interatomic spacing of the solid during heating thereby expanding it. | |
d. | The frequency of vibration of the atoms increases. |
Question 3
Appeared in Year: 2014
Question MCQ▾
Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross-section. In this region the bubbles
Choices
Choice (4) | Response | |
---|---|---|
a. | move with greater speed and are smaller than in the rest of the pipe | |
b. | move with greater speed and are larger in size than in the rest of the pipe | |
c. | move with lesser speed and are of the same size as in the rest of the pipe | |
d. | move with lesser speed and are smaller than in the rest of the pipe |