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Showing posts with label optics. Show all posts
Showing posts with label optics. Show all posts

Wednesday 15 June 2016

The National Optical Fiber Network (NOFN) will be executed by

Question: The National Optical Fiber Network (NOFN) will be executed by

A) BSNL
B) MTNL
C) BBNL
D) Bharati Airtel

Answer: BBNL

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Explanation: The committee has proposed to rename the project National Optical Fiber Network (NOFN) as BharatNet, which is to be completed by December 2017 at an estimated cost of Rs 72,778 crore. Bharat Broadband Network Ltd (BBNL) is a special purpose vehicle created under the Companies Act of 1956 for execution of the NOFN project.
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Monday 14 September 2015

Optical fibres, though bent in any manner allows light to pass through. What is the inference that one can draw from it?

NDA NA Exam I 2015 Questions

Question 70 Optical fibres, though bent in any manner allows light to pass through. What is the inference that one can draw from it?

A) The concept that light travels in straight path is wrong
B) Light can flow through optical fibres
C) Light can travel through the fibres because of their ductility
D) Light can travel through the fibres due to multiple total internal reflections

Answer: Light can travel through the fibres due to multiple total internal reflections

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Tuesday 14 July 2015

Which of the following is the largest Biosphere Reserves of India?

Post 335

SSC CHSL Questions 2014

Question 182 Which of the following is the largest Biosphere Reserves of India?

A) Nilgiri
B) Nandadevi
C) Sundarbans
D) Gulf of Mannar

Answer: Gulf of Mannar

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Explanation : Gulf of Mannar is the largest Biosphere Reserve of India. It covers an area of 10,500 square kilometer.

Question 183 Rainbow is formed due to

A) refraction and dispersion
B) scattering and refraction
C) diffraction and refraction
D) refraction and reflection

Answer: refraction and dispersion

Question 184 Golden view of sea shell is due to 

A) Diffraction
B) Dispersion
C) Polarization
D) Reflection

Answer: Polarization

 

Sunday 5 July 2015

plane mirror image formation

Post 219

Question 9 A person standing 1 m in front of a plane mirror approaches the mirror by 40 cm. The new distance between the person and his image in the plane mirror is
A) 60 cm
B) 1.2 m
C) 1.4 m
D) 2.0 m
Answer: 1.2 m
Explanation: Image fored in the plane mirror lies on the same distace on which object is lying away from the plae mirror.
Now he was standing 1 m away that is 100 cm
he walks towards plain mirror 40 cm
so the new distace b/w mirror and object is 60 cm
so the new distance bw image and object is 60 cm *2 = 120 cm that is 1.2 m.

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