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 Physics Questions

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Q:

The coil wire in the electric room heater or electric cooking heater is called __________.

A) Circuit B) Element
C) Filament D) Cells
 
Answer & Explanation Answer: B) Element

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Q:

The attenuation in optical fibre is mainly due to

A) Scattering B) Absorption
C) Both (a) and (b) D) Neither absorption nor scattering
 
Answer & Explanation Answer: A) Scattering

Explanation:

The reason for transmitting data over optical fibers, is because the speed of data transmission through optical wires are equal to the speed of light. The intense speed of data transfer speed, has lead to the use of optical fibers. The optical fiber uses the technology of transferring light beams, from one end to the other end of optical cables. The attenuation in optical fiber is due to Scattering. The reason why scattering is caused, due to the folding, in the wire.

 

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Q:

The absolute refractive index of air is

A) 1.03 B) 1.00003
C) 1.003 D) 1.0003
 
Answer & Explanation Answer: D) 1.0003

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Q:

________________ refers to the superposing of two or more coherent waves to produce regions of maxima and minima in space, according to the principle of superposition.

A) Interference B) Rectification
C) Intensity D) Diffraction
 
Answer & Explanation Answer: A) Interference

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Q:

When a number of resistance are connected in ___, their combined resistance is less than the smallest individual resistance.

 

A) parallel B) horizontal
C) series D) box
 
Answer & Explanation Answer: A) parallel

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Q:

If the power of a corrective lens is +2.0 D, then it is a

A) convex lens B) concave lens
C) convex mirror D) concave mirror
 
Answer & Explanation Answer: A) convex lens

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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is double that of earth and radius is same as that of earth is _________________.

A) 2g B) g
C) g/2 D) 4g
 
Answer & Explanation Answer: A) 2g

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Q:

Insulators have resistivity of the order of 

A) 106 Ω m to 108 Ω m B) 10-12 Ω m to 10-17 Ω m
C) 10-8 Ω m to 10-6 Ω m D) 1012 Ω m to 1017 Ω m
 
Answer & Explanation Answer: D) 1012 Ω m to 1017 Ω m

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