# AIIMS (All India Institute of Medical Sciences) Physics: Questions 261 - 265 of 500

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## Question number: 261

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MCQ▾

### Question

A conducting sphere of radius 20 cm is charged with . Another uncharged sphere of radius 60 cm is allowed to touch it for some time. After that if the sphere are separated, then surface density of charged on the spheres will be in the ratio of:

### Choices

Choice (4)Response

a.

1: 3

b.

2: 1

c.

3: 1

d.

1: 2

## Question number: 262

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MCQ▾

### Question

A string in a musical instrument is 80 cm long and its fundamental frequency is 1000 Hz. If a frequency of 1400 Hz is to be produced, then required length of string is –

### Choices

Choice (4)Response

a.

72.3 cm

b.

65 cm

c.

62.4 cm

d.

57.1 cm

## Question number: 263

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MCQ▾

### Question

The distance of two planets from the sun are in the ratio 3: 1. Assuming that they are moving in circular orbits, what will be the ratio of their time periods?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 264

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MCQ▾

### Question

Find the elastic potential energy of water at depth of 800 m. Compressibility of water is , density of water ,

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 265

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MCQ▾

### Question

Calculate the volume of water flowing in 20 minute through a horizontal tube of 0.4 cm diameter, 80 cm long. The pressure head across the ends of the tube is 30 cm of water column. Coefficient of viscosity of water is S. I. units .

### Choices

Choice (4)Response

a.

b.

c.

d.

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