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 Physics Questions

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Q:

Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?

 

A) The cloth completely absorbs red colour wavelength B) It is due to refraction
C) It is the effect of scattering of light D) It is due to Parallax error
 
Answer & Explanation Answer: A) The cloth completely absorbs red colour wavelength

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Q:

What is the resistance (in Ω) of an electrical component if a current of 0.2 A passes through it on application of 8 V of potential difference across it?

 

A) 40   B) 1.6  
C) 80   D) 3.2
 
Answer & Explanation Answer: A) 40  

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Q:

Which of the following has the same unit as energy?

A) Work B) Power
C) Density D) Force
 
Answer & Explanation Answer: A) Work

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Q:

Two identical resistors of 20 ohm each are connected in parallel. This combination, in turn, is connected to a 10 ohm resister. The equivalent resistance of the combination will be

A) 30 ohm B) 10 ohm
C) 5 ohm D) 20 ohm
 
Answer & Explanation Answer: A) 30 ohm

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Q:

Sound CANNOT travel through

A) Air B) Vacuum
C) Liquid D) Solid
 
Answer & Explanation Answer: B) Vacuum

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Q:

What of the given below devices converts chemical energy to electrical energy?

A) Transformer B) Battery
C) Electric Generator D) Wheel
 
Answer & Explanation Answer: B) Battery

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Q:

An object of 5.0 kg is raised through a height of 2.0m. The work done in the process is

A) 49 J B) 10 J
C) 19.6 J D) 98 J
 
Answer & Explanation Answer: D) 98 J

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Q:

In a concave mirror when the object is placed at infinity which of the following applies to the image?

A) Real, inverted, highly enlarged image at center of curvature (C) B) Real, inverted image of the same size at centre of curvature (C)
C) Real, inverted, diminished image between centre of curvature (C) and principal focus (F) D) Real, inverted, highly diminished image at focus
 
Answer & Explanation Answer: D) Real, inverted, highly diminished image at focus

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