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Q:

Which of the following glows with special colour depending on the nature of gas in the fluorescent tube?

A) Plasma B) Hydrogen
C) Helium D) Bose-Einstein condensate
 
Answer & Explanation Answer: A) Plasma

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Q:

A person holding a pen in his left hand sees his reflection in the mirror holding the pen in his right hand. This is due to which of the following phenomena?

A) Diffused reflection B) Total internal reflection
C) Lateral inversion D) Refraction
 
Answer & Explanation Answer: C) Lateral inversion

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Q:

Heavy water is mostly used in which of the following?

A) In fire extinguisher B) In nuclear reactors
C) In washing cloth D) In both Nuclear reactors and Fire extinguisher
 
Answer & Explanation Answer: B) In nuclear reactors

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Q:

In the equation of motion 2as = v2 - u2, s represents _________________.

A) speed B) displacement  
C) velocity D) acceleration
 
Answer & Explanation Answer: B) displacement  

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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:

Which of the following is false with reference to a photo-voltaic cell?

A) It is another name as solar cell B) It can be used as infra-red detectors
C) It can store light energy in the form of electrical energy D) It converts electric energy into light energy
 
Answer & Explanation Answer: D) It converts electric energy into light energy

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Q:

Air expands when it _______________.

A) is cooled B) is heated
C) is under pressure D) becomes more humid
 
Answer & Explanation Answer: B) is heated

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Q:

Calculate the pressure (in Pa) if a thrust of 800 N is applied to an area of 16 m2.

A) 128 B) 100
C) 64 D) 50
 
Answer & Explanation Answer: D) 50

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