27) What is electroplating? What are its uses?
29) Explain the phenomenon of dispersion of light.
30) Write a note on 'The Human Eye' with neat sketch.
31) Give short notes on Nucleus.
32) Draw and label the parts of Animal cell.
Answers
Answer:
electroplating is process to make a coating of layer of one object on another. for ex - chromium plating on iron
Answer:
27)The process of coating the thin layer of metals with desired metal to resist from rust is called electroplating.
Three uses of electroplating are-
1-Tin cans used for storing food are made by electroplating tin metal on to iron.
2-it is used in bicycle to resist rust or corrosion.
3-it is used in LPG stoves to resist rust.
Explanation:
29)When white light is passed through a glass prism it splits into its spectrum of colours (in order violet, indigo, blue, green, yellow, orange and red) and this process of white light splitting into its constituent colours is termed as dispersion.
30)The eye is an important and one of the most complex sense organ that we humans are endowed with. It helps us in visualizing objects and also helps us in light perception, color, and depth perception. Besides, these sense organs are pretty much similar to cameras, and they help us see objects when light coming from outside enters into them. That being said, it is quite interesting to understand the structure and working of a human eye. It helps us also in understanding how a camera also actually functions. Let’s have a glance on the human eye – it’s structure and function.
31) The nucleus is one of the most important cell organelles found in eukaryotic cells. It is a membrane-bound organelle that contains the entire genetic information of the cell.The nucleus is also one of the largest structures in the cell, occupying almost 10% of the cell’s total volume in most eukaryotic cells.
32)
