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.

Edit

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.

Edit

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

Edit