Tag: physics

Questions Related to physics

Atmospheric electricity is generated due to 

physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

  1. the accumulation of static charges

  2. the accumulation of moving charges

  3. the destruction of static charges

  4. destruction of moving charges

Show answer
Correct Option: A
Explanation:

The presence of electrical action is the atmosphere, due to the accumulation of enormous static charges generated by friction of air upon itself, can be accounted for the generation of atmospheric electricity i.e, lightening and thunderstorms. 

The theory of atmospheric electricity explains which of the following phenomena?

physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

  1. Free electricity causes thunderstorms

  2. Current due to a charge

  3. The high temperature causes people

  4. None of the above

Show answer
Correct Option: A
Explanation:
Atmospheric electricity is the study of electrical charges in the Earth's atmosphere (or that of any planet). One of the phenomenons that is a result of this is that free electricity causing thunderstorm.

Static charges in the atmosphere is generated by

physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

  1. induction from the earth's surface

  2. conduction between clouds

  3. friction of the air upon itself

  4. No reason

Show answer
Correct Option: C
Explanation:

The accumulation of enormous static charges in the atmosphere is generated by the friction of air upon itself. Such accumulation of static charges in the atmosphere can be the cause of atmosphere electricity. 
.

Atmospheric electricity was discovered by

physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

  1. Isaac Newton

  2. Michael Faraday

  3. Benjamin Franklin

  4. Thomas Edison

Show answer
Correct Option: C
Explanation:

Atmospheric electricity is the study of electrical charges in the earth's atmosphere. Benjamin Franklin discovered it. His experiments showed that electrical phenomenon of atmosphere were not fundamentally different from those produced in the laboratory by listing many similarities between electricity and lighting. 

State whether the given statement is True or False :

Lightning conductor always develops the opposite charges as is the charge in the clouds.

physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Lightening conductor always develops the opposite charges as in the charge in the clouds. This statement is true. Because according to the lightening dissipative theory, which states that as a cloud approaches a building, there is a conductive pathway established between the statically charged cloud and lightening rod. The charge induced by the cloud on lightening rod is opposite to that  on the cloud. According to this theory, static charges gradually migrate along this pathway to the ground, thus reducing the explosive discharge.

The lower portion of a charged cloud generally carries .............. .

physics some natural phenomena how lightning occurs? the story of lightning advanced of lightning

  1. Apositive charge

  2. Anegative charge

  3. Air

  4. No charge

Show answer
Correct Option: A

How many colours comprises white light?

newton's colour disc light and the formation of shadows physics

  1. infinite

  2. seven

  3. three

  4. fourteen

Show answer
Correct Option: B
Explanation:

White light comprises of seven colours- Violet, Indigo, Blue. Green, Yellow, Orange , Red. 

So, when white light consisting  of seven colors falls on a transparent medium (glass prism) , each color in it is refracted ( or deviated ) by a different angle , with the result that seven colors are spread out to form a spectrum, The red color is deviated least , so it forms the upper part of the spectrum . On the other hand, violet color is deviated the maximum, so violet appears at the bottom of the spectrum.

Monochromatic light is that light in which :

newton's colour disc light and the formation of shadows physics

  1. yellow and red light is present

  2. various wavelengths are present

  3. red and violet light is present

  4. single wavelength is present

Show answer
Correct Option: D
Explanation:

Chromatic is something related to color. So "monochromatic" means a single color, which means light of single wavelength. 
Hence correct answer is D.

Which of the following sources of light is different from others ?

newton's colour disc light and the formation of shadows physics

  1. Sunlight

  2. White light

  3. Light from a bulb

  4. Sodium light

Show answer
Correct Option: D
Explanation:

$Answer:-$ D option

Sunlight,white light , light from bulb when passed from prism will split into its constituent colours,i.e. spectrum will be seen.
But when sodium light is passed it will not show colour band since it is a monochromatic light(light having only one constituent colour). 

_________ discovered that white light consists of seven colours.

newton's colour disc light and the formation of shadows physics

  1. Walt Disney

  2. Frank Starling

  3. Laplace

  4. Sir Isaac Newton

Show answer
Correct Option: D
Explanation:

Sir Isaac Newton in 1666 discovered that light consists of seven colours.