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Q:

Optical fiber works on the principle of -

A) Diffusion B) Total Internal Reflection
C) Scattering D) Refraction
 
Answer & Explanation Answer: B) Total Internal Reflection

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Q:

An earthquake of magnitude 6 on Richter scale has ______________ times more destructive energy than an earthquake of magnitude 4.

A) ten B) hundred
C) five D) thousand
 
Answer & Explanation Answer: D) thousand

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Q:

The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called ___

A) inertia B) momentum
C) energy D) force
 
Answer & Explanation Answer: A) inertia

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Q:

In a transformer the tappings are generally provided on

A) Primary side B) low voltage side
C) High voltage side D) Secondary side
 
Answer & Explanation Answer: C) High voltage side

Explanation:

Tappings are provided in order to maintain the terminal voltage across the loads within the permissible specified limits with respect to load variations.

Generally tappings are preferred on HV side, because the HV side is low current side, tap changer involves low current interruption and large variations or small steps are possible due to more no of turns.

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Q:

A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/sq.s) is:

A) 3 B) 5
C) 6 D) 7
 
Answer & Explanation Answer: A) 3

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Q:

What is the SI unit of Power?

A) Boyle B) Watt
C) Newton D) Pascal
 
Answer & Explanation Answer: B) Watt

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Q:

_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.

A) Acaulis B) Alatus
C) Albopictus D) Aurora
 
Answer & Explanation Answer: D) Aurora

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Q:

Calculate the frequency (in Hz) of a sound wave of wavelength 5 m travelling with a speed of 360 m/s.

A) 1800 B) 36
C) 900 D) 72
 
Answer & Explanation Answer: D) 72

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