Shreya spins a multicoloured wheel rapidly. What colour will the rapidly spinning wheel appear to be?

The relationships between primary colours, secondary colours, tertiary colours, etc. are shown by a colour wheel or colour circle, which is an abstract graphical organisation of colour hues around a circle. It was first discovered by Isaac Newton. He observed light split into different colours, and then when the colours recombined made white light again. Hence, when the wheel is rapidly spinning, it appears to be white because of the superposition of all the colours.

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 2

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The picture shows a glass bowl.

What should be done to make the glass bowl act as a mirror?

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Important Questions on Light

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 3

Microscopes are used to view microorganisms. What type of lens is used in a microscope?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 4

Seema dropped a water droplet on a newspaper. She found that the letters are appearing larger through the droplet.

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Why are the letters appearing larger through the droplet?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 5

Which of these is true about the image formed by a concave lens?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 6

Ayesha keeps a toy in front of a plane mirror. She then looks at the mirror to see the image of the toy.

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At which point will the image of the toy be formed in the mirror?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 7

What type of image is formed in the mirror?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 9

Shreya spins a multicoloured wheel rapidly.

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What colour will the rapidly spinning wheel appear to be?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 10

The diagram shows a patient having her eyes tested. A chart with letters on it is placed behind her, and she sees the chart reflected in a plane mirror.
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How far away from the patient does the chart seem to be?

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Science Textbook of Competency Based Questions for Class VII>Chapter 15 - Light>Exercise>Q 11

Veena observes the time in the clock shown in picture, through a mirror and thinks it is $9 : 40$ . Her, sister Regha told that she is wrong. What would be the actual time?

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