In multimode step index fibre the refractive index of core and cladding is____________?

Related Mcqs:

1. Which one of the following material is most suitable for making core of an electromagnet ?

   A. air
   B. steel
   C. Cu-Ni alloy
   D. soft iron

2. The core of a transformer is laminated to reduce energy losses due to__________?

   A. Eddy currents
   B. Hysteresis
   C. Resistance in winding
   D. None of these

   Submitted by: Tauseef Ali

3. The average acceleration caused by gravity per second is____________?

   A. 22 feet
   B. 32 feet
   C. 52 feet
   D. 42 feet

   Submitted by: Yalmaz Fahim

4. A lens which converges a beam of parallel rays to a point is called______________?

   A. diverging (or concave) lens
   B. converging (or convex) lens
   C. plano concave lens
   D. plano convex lens

5. The diameter of a lens is called________________?

   A. focal length
   B. principal axis
   C. aperture
   D. radius of curvature

6. The least distance of distinct vision for a normal eye is_______________?

   A. 15 cm
   B. 25 cm
   C. 30 cm
   D. 40 cm

7. Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?

   A. 0.5
   B. 0.2
   C. 1
   D. 2

8. A convex lens gives a virtual image only when the objects lies_________________?

   A. between principal focus and center of curvature
   B. beyond 2 f
   C. at the principal focus
   D. between principal focus and optical center

9. Errors in the transmission of power through optic fiber can be minimized by using a______________?

   A. Multimode index fiber
   B. Graded index fiber
   C. Single mode step index fiber
   D. Copper wire

10. The equation θ = 1.22 λ/D was devised by_______________?

    A. Newton
    B. Einstein
    C. Raleigh
    D. Planks