KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 90 - 92 of 268

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Question number: 90

Appeared in Year: 2014

MCQ▾

Question

Consider two thermometers T1 and T2 of equal length which can be used to measure temperature over the range θ1 to θ2. T1 contains mercury as the thermometric liquid while T2 contains bromine. The volumes of the two liquids are the same at the temperature θ1. 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 d1 and d2 respectively, then the ratio d1: d2 would be closest to –

Choices

Choice (4) Response

a.

0.4

b.

2.5

c.

6.0

d.

0.6

Question number: 91

Appeared in Year: 2014

MCQ▾

Question

An ideal gas follows a process described by from (P1, V1, T1) to (P2, V2, T2) (C is a constant). Then –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 92

Appeared in Year: 2013

MCQ▾

Question

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.

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