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Q:

Optical fiber works on the principle of

A) Scattering B) interference
C) total internal reflection D) refraction
 
Answer & Explanation Answer: C) total internal reflection

Explanation:

Optical_fiber_works_on_the_principle_of1556277954.jpg image

 

Optical fiber works on the principle of total internal reflection.

 


The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

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Q:

Find the work done (in J) when a charge of 20 C moves across a potential difference of 4 V.

 

 

A) 5 B) 40
C) 80 D) 10
 
Answer & Explanation Answer: C) 80

Explanation:
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Q:

Find the potential energy gained by a body of mass 60 kg, if it is raised by 12 m. (use g = 10 m/s2)

 

A) 7200 B) 50
C) 3600 D) 25
 
Answer & Explanation Answer: A) 7200

Explanation:
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Q:

The rate of change of linear momentum of a body falling freely under gravity is equal to it's ____ ?

A) Kinetic Energy B) Weight
C) Potential Energy D) Impulse
 
Answer & Explanation Answer: B) Weight

Explanation:

Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.

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Q:

Which of the following is a bad conductor of heat?

 

A) Wood  B) Diamond
C) Water  D) Mica
 
Answer & Explanation Answer: A) Wood 

Explanation:
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Q:

Which is best used as a sound absorbing material in partition walls ?

A) Stone chips B) Steel
C) Glass - wool D) Glass pieces
 
Answer & Explanation Answer: C) Glass - wool

Explanation:

Materials that do not transfer mechanical energy well. These tend to be soft,flexible, low density, and with high surface area to linear area ratios.

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Q:

Seismic waves are recorded by an instrument called the ________________.

 

A) seismograph B) odograph
C) isograph D) lithograph
 
Answer & Explanation Answer: A) seismograph

Explanation:
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Q:

Which of the following is based on the principle of nuclear fusion?

 

A) Atomic bomb B) Hydrogen bomb
C) Both Atomic and Hydrogen bomb D) No option is correct
 
Answer & Explanation Answer: B) Hydrogen bomb

Explanation:
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