Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.
1. Polished wooden table
2. Chalk powder
3. Cardboard surface
4. Marble floor with water spread over it
5. Mirror
6. Piece of paper
1. Polished wooden table
2. Chalk powder
3. Cardboard surface
4. Marble floor with water spread over it
5. Mirror
6. Piece of paper
Solution and Explanation
(a) A polished wooden table is an example of smooth surface. So, when a beam of light reflects from it, a regular reflection will take place.
(b) Chalk powder has irregular surface. So, when a beam of light reflects from it, a diffused reflection will take place.
(c) A cardboard has irregular surface. So, when a beam of light reflects from it, a diffused reflection will take place.
(d) A marble floor with water spread over it provides a smooth surface. So, when a beam of light reflects from it, a regular reflection will take place.
(e) A mirror has a smooth surface. So, when a beam of light reflects from it, a regular reflection will take place.
(f) A piece of paper may appear smooth but it has many minor irregularities. So, when a beam of light reflects from it, a diffused reflection will take place.
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Questions Asked in CBSE Class VIII exam
Underline the verbs and arrange them in two columns, Past and Earlier past.
(a) My friends set out to see the caves in the next town, but I stayed at home, because I had seen them already.
(b) When they arrived at the station, their train had left. They came back home, but by that time I had gone out to see a movie!
(c) So they sat outside and ate the lunch I had packed for them.
(d) By the time I returned, they had fallen asleep!
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Fill in the blanks using the correct form of the verbs in brackets.
My little sister is very naughty. When she ____ (come) back from school yesterday, she had _____(tear) her dress. We _____(ask) her how it had _____(happen). She ______(say) she _____ _____ (have, quarrel) with a boy. She _____ _____ (have, beat) him in a race and he _____ ____ (have, try) to push her. She _____ ____ (have, tell) the teacher and so he _____ _____ (have, chase) her, and she _____ _____ (have, fall) down and _____ _____ (have, tear) her dress.
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A
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2. Sanjeev made it to safety after the tsunami.
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Concepts Used:
Light-Dependent Reaction
One of the major surfaces of Light Reaction is giving rise to organic energy molecules, such as ATP and NADPH, which are especially necessary for the subsequent occurrence of the dark reaction that works without the presence of sunlight.
- During the process of light reaction, the elemental step involves chlorophyll absorbing the energy released from the sunlight and transforming it into chemical energy in the appearance of electron charge carrier molecules, like ATP and NADPH, with photosynthesis happening or occurring subsequently.
- This procedure in general takes place in large complexes of protein, called Photosystems, which are further categorized into PSI and PSII.
- The elevated pigments of chlorophyll then give their electrons up. In order to recompense for the loss of electrons, water is usually cleaved to discharge four H+ ions, four electrons, and O2.
- The lost electrons of the PSII further enter ETC, concise or abbreviated from Electron Transfer Chain. Upon entering ETC, the electrons unite with NADP+, bringing it down further to NADPH.
- There is a subsequent movement of electrons that is used for the transportation of hydrogen ions over the thylakoid membrane.
- The H+ ions, subsequent to building up within the lumen, help build a layer of a positive gradient. These H+ ions, in the presence of ATP synthase, combine with the ADP to further form ATP.
- Oxygen, afterward, which holds on to as a waste product gets released into the atmosphere.