Communication System-Basic Elements of Communication System (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 1 - 6 of 9

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Question number: 1

» Communication System » Basic Elements of Communication System

MCQ▾

Question

If μ 1 and μ 2 are two refractive indices of the materials of core and cladding of an optical fiber, then the loss of light due to its leakage can be minimized by having

Choices

Choice (4) Response

a.

μ 1 = μ 2

b.

μ 1 < μ 2

c.

μ 1 > μ 2

d.

Question does not provide sufficient data or is vague

Question number: 2

» Communication System » Basic Elements of Communication System

MCQ▾

Question

A laser beam is used for carrying out surgery because it

Choices

Choice (4) Response

a.

Is highly directional

b.

Is highly monochromatic

c.

Can be sharply focused

d.

Is highly coherent

Question number: 3

» Communication System » Basic Elements of Communication System

MCQ▾

Question

Laser beams are used to measure long distances because

Choices

Choice (4) Response

a.

They have high degree of parallelism

b.

They are highly polarised

c.

They are coherent

d.

They are monochromatic

Question number: 4

» Communication System » Basic Elements of Communication System

MCQ▾

Question

The phenomenon by which light travels in an optical fibers

Choices

Choice (4) Response

a.

Transmission

b.

Total internal reflection

c.

Refraction

d.

Re-reflection

Passage

Read the passage given below and answer the questions that follow:

The electron density of a layer of ionosphere at a height 150 km from the earth’s surface is 9 ⨯ 10 9 per m 3. For the sky transmission from this layer up to a range of 250 km,

Question number: 5 (1 of 1 Based on Passage) Show Passage

» Communication System » Basic Elements of Communication System

MCQ▾

Question

Angle of incidence of this layer is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

0 0

Question number: 6

» Communication System » Basic Elements of Communication System

MCQ▾

Question

What should be the maximum acceptance angle at the air core interface of an optical fiber if n 1 and n 2 are the refractive indices of the core and the cladding respectively?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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