# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 88 - 90 of 268

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## Question number: 88

Appeared in Year: 2012

MCQ▾

### Question

On a bright sunny day a diver with height h stands at the bottom of a lake of depth H. Looking upward, he can see objects outside the lake in a circular region of radius r. Beyond this circle he sees the images of objects lying on the floor of the lake. If refractive index of water is, then the value of r is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 89

Appeared in Year: 2013

MCQ▾

### Question

The figure below shows pressure variation in two different sound waves in air with time at a given position. Both the figures are drawn to the same scale.

Which of the following statements is true?

### Choices

Choice (4) Response

a.

Wave 1 has higher frequency and greater amplitude compared to wave 2

b.

Wave 1 has lower frequency and smaller amplitude compared to wave 2

c.

Wave 1 has shorter wavelength and greater amplitude compared to wave 2

d.

Wave 1 has shorter wavelength and smaller amplitude compared to wave 2

## 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

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