Tag: physics

Questions Related to physics

Which of the following most appropriately defines a spectrum?

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

  1. The band of seven colours is known as spectrum

  2. The process of splitting of white light into seven colours is known as spectrum

  3. The different wavelength of light are termed as spectrum

  4. All of the above

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Correct Option: A
Explanation:

Visible range consists of seven different colours i.e, VIBGYOR. The band of these seven colours is known as spectrum.

Newton's colour disc was invented by whom?

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

  1. Albert Einstein

  2. Sir Isaac Newton

  3. Sir Isaac Newton and Faraday

  4. Sir Isaac Newton and John Kennedy

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Correct Option: B
Explanation:

Newton's colour disc, as the name suggests, was invented by Sir Issac Newton and is a disc with seven segments in rainbow colours.

Hence, the correct answer is OPTION B. 

The light of one single colour is called:

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

  1. monochromatic

  2. multichromatic

  3. dichromatic

  4. polychromatic

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Correct Option: A
Explanation:

Monochrome means single colour. The light of one single colour is monochromatic. White light have seven colours. So it is polychromatic.

What does Newton's colour disc possess?

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

  1. 7 segments in rainbow colours

  2. 5 segments in rainbow colours

  3. 4 segments in rainbow colours

  4. 9 segments in rainbow colours

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Correct Option: A
Explanation:

Newton's colour disc, as the name suggests, was invented by Sir Issac Newton and is a disc with seven segments in rainbow colours.

Hence, the correct answer is OPTION A. 

From below given colors, which colour is not present in 7 colours of rainbow?

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

  1. Violet

  2. Purple

  3. Green

  4. Indigo

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Correct Option: B
Explanation:

As per VIBGYOR we have :Violet, Indigo, Blue, Green, Yellow, Orange and Red colour in rainbow.

Due to which phenomena the combination of red, green and blue forms the same white colour

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

  1. Due to persistence of vision

  2. Due to reflection

  3. Due to refraction

  4. Due to deviation

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Correct Option: A
Explanation:

Due to persistence of vision the combination of red, green and blue forms the same white color.

It was the British scientist _______who discovered in 1666 that light consists of seven colours. Fill in the blank.

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

  1. Henry

  2. John Dalton

  3. Sir Issac Newton

  4. Einstein

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Correct Option: C
Explanation:

Correct answer is (a) Sir Issac Newton.

In 1666, during one of his optical experiments, Newton passed a beam of sunlight through a glass prism. The glass prism split the light into a band of seven colours on his wall. This phenomena is known as dispersion of light

He called this band of colours the ‘spectrum’. Thus the spectrum is a band of seven colours which is obtained by splitting of white light by a glass prism.

The discovery of Newton's colour disc proves which of the following statement?

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

  1. Light is colourless

  2. Light is not colourless

  3. Light has only 1 colour

  4. Light has only 3 basic colours

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Correct Option: B
Explanation:

The perception of a picture or a color stays in the human brain for a fraction of a second. Newton's color disk is a mechanical device that rotates an array of colors arranged as petals or gradients around an axis and when the disc rotates fast enough the perception of the color changes to white. This is because white light is nothing but the mixture of light of all wavelengths in the visible range.

Sir Isaac Newton used this device to prove the above assertion that white color is the mixture of all colors.

SO Light is not colourless.

When sun rays are passed through a glass prism it gets

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

  1. Deviated, but not dispersed

  2. Deviated and dispersed

  3. Dispersed, but not deviated

  4. Neither deviated nor dispersed

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Correct Option: B

Which of the following two colours are complementary colours? 

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

  1. Red and Gresn

  2. Red and Magenta

  3. Red and Cyan

  4. Yellow and Red

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Correct Option: C