IFS (Forests Services) Physics (Mains): Questions 17 - 21 of 34

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Question number: 17

» Classical Mechanics » System of Particles » Constraints

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Appeared in Year: 2010

Essay Question▾

Describe in Detail

How can one introduce the constraints of motion through the concept of generalized coordinate systems? Write down the set of transformation equations for a system of particles relating the generalized coordinates with real coordinates. (Section A)

Explanation

  • In mechanics, mostly problems can be reduced by solving differential equation, which consist of all the forces acting on a system. A such equation is given by,

  • As we know, all mechanical systems have constraint force acting on them to some degree. A constrain

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Question number: 18

» Physical Optics » Polarisation and Modern Optics » Principles of Fibre Optics Attenuation

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Appeared in Year: 2010

Essay Question▾

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With a suitable diagram, deduce an expression for numerical aperture (NA) for ab optical fiber having refractive indices of core and cladding and , respectively and being placed in a medium of index . (Section – A)

Explanation

Quadrilateral poly1 Quadrilateral poly1: Polygon A, B, C, D Quadrilateral poly2 Quadrilateral poly2: Polygon D, E, F, C Quadrilateral poly3 Quadrilateral poly3: Polygon E, F, G, H Angle α Angle α: Angle between W, Z, I Angle β Angle β: Angle between Z, A_1, C_1 Angle γ Angle γ: Angle between A_

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Question number: 19

» Physical Optics » Polarisation and Modern Optics » Principles of Fibre Optics Attenuation

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Appeared in Year: 2010

Short Answer Question▾

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Between multimode and single mode fibers, explain critically how and why single mode fiber is chosen for communication. (Section – A)

Question number: 20

» Physical Optics » Polarisation and Modern Optics » Single Mode Fibres

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Appeared in Year: 2010

Short Answer Question▾

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Why are the two wavelengths and important in single – mode fiber – optical communication system? (Section – A)

Question number: 21

» Special Relativity, Waves & Geometrical Optics » Waves » Simple Harmonic Motion

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Appeared in Year: 2013

Essay Question▾

Describe in Detail

A block of mass is attached to one end of a combination of two massless spring connected in series. The other end of the combination is fixed to a rigid support. The spring constant of the two spring are and , respectively. The block is free to move on a frictionless horizontal surface. If the block is pulled a little and then released, calculate the frequency of oscillation of the block.

Explanation

Series combination of Springs

Series Combination of Springs

In figure a series combination of the springs are shown. One end is connected with a block of mass m.

  • In figure a block of mass is connected with one end of the series combination of springs having spring constant . And other end of combination is connected with the rigid suppo

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