Properties of Solids & Liquids (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 3 of 15

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Question number: 1

» Properties of Solids & Liquids » Surface Energy and Surface Tension

Appeared in Year: 2013

MCQ▾

Question

Young-Laplace law states that the excess pressure inside a soap bubble of radius R is given by Equation 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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 2

» Properties of Solids & Liquids » Thermal Expansion

Appeared in Year: 2014

MCQ▾

Question

A solid expands upon heating because –

Choices

Choice (4) Response

a.

The potential energy of interaction between atoms in the solid is asymmetric about the equilibrium positions of atoms.

b.

a fluid called the caloric flows into the interatomic spacing of the solid during heating thereby expanding it.

c.

The frequency of vibration of the atoms increases.

d.

The heating generates a thermal gradient between opposite sides.

Question number: 3

» Properties of Solids & Liquids » Bernoulli's Principle and Its Applications

Appeared in Year: 2014

MCQ▾

Question

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 larger in size than in the rest of the pipe

b.

move with lesser speed and are smaller than in the rest of the pipe

c.

move with greater speed and are smaller than in the rest of the pipe

d.

move with lesser speed and are of the same size as in the rest of the pipe

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