List of top Science and Technology Questions on Human Eye and The Colourful World

Draw a neat labelled diagram of electric motor and write its principle. 

An electric tungsten bulb is connected into a home circuit. The home electric supply runs at 220 volt potential difference. When switched on, a current of 0.45 A flows through the bulb. What must be the power (wattage) of the bulb? If it is kept ‘on’ for 10 hours, how many units of electricity will be consumed?
For normal human eye, the minimum distance of distinct vision is ..................
Name the capacity of the eye lens to change its focal length as per need.
Name the defect of eye vision in which the focussing power of eye lens decreases with age.
What is the minimum distance of distinct vision for a normal human eye?

खालील प्रश्न सोडवा :
खालील आकृतीतील दृष्टिदोषाचे नाव लिहा : 
 

आकृतीतून खालील प्रश्नांची उत्तरे लिहा : 
 

(a) वरील आकृतीमध्ये कोणत्या प्रकाशाच्या दृष्टीदोषाचे चित्रण केले आहे? 
(b) हा दृष्टीदोष निर्माण होण्याचे कारण कोणते? 
(c) या दृष्टीदोषाचे निराकरण कसे करतात? 
(d) सरासरी दृष्टीदोषाचे निराकरण केलेले चष्म्याचे, अथवा नामनिर्देशित आकृती काढा. 
 

Observe the figure and answer the following questions: 

  1. Name the defect of vision represented in the above figure. 
  2. State the reasons for this defect. 
  3. How is it corrected? 
  4. Draw the diagram to show the correction of this defect.