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Q:

Optical fibre works on which of the following principle of light?

A) Reflection B) Refraction
C) Diffraction D) Total internal reflection
 
Answer & Explanation Answer: D) Total internal reflection

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Q:

What is the unit of the physical quantity, Electrical conductance?

A) lux B) ohm
C) farad D) siemens
 
Answer & Explanation Answer: D) siemens

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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:

A body of mass 2 kg is thrown upward with initial velocity of 20 m/s. After 2 seconds, its kinetic energy will be : (g = 10 m/sq.s)

A) 0J B) 200J
C) 400J D) 100J
 
Answer & Explanation Answer: A) 0J

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Q:

The SI unit of G, the universal gravitation constant is ______________.

A) N m2 kg2 B) N m2 kg-2
C) N m-2 kg-2 D) N m-2 kg2
 
Answer & Explanation Answer: B) N m2 kg-2

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Q:

The SI unit of acceleration is _______________.

A) meters per seconds squared B) meters per second
C) seconds per meter D) seconds per meter squared
 
Answer & Explanation Answer: A) meters per seconds squared

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Q:

When we see an object, the image formed on the retina is ________

A) Real and inverted B) Real and erect
C) Virtual and erect D) Virtual and inverted
 
Answer & Explanation Answer: A) Real and inverted

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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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