Chapters
Chapter 2: Work and Energy
Chapter 3: Current Electricity
Chapter 4: Measurement of Matter
Chapter 5: Acids, Bases and Salts
Chapter 6: Classification of Plants
Chapter 7: Energy Flow in an Ecosystem
Chapter 8: Useful and Harmful Microbes
Chapter 9: Environmental Management
Chapter 10: Information Communication Technology (ICT)
Chapter 11: Reflection of Light
Chapter 12: Study of Sound
Chapter 13: Carbon : An important element
Chapter 14: Substances in Common Use
Chapter 15: Life Processes in Living Organisms
Chapter 16: Heredity and Variation
Chapter 17: Introduction to Biotechnology
Chapter 18: Observing Space : Telescopes
Chapter 18: Observing Space : Telescopes
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board Chapter 18 Observing Space : Telescopes Exercise [Page 214]
Fill in the blanks with the proper words.
The wavelength of visible light is between …….. and ………
Fill in the blank with the proper word.
GMRT is used for ……. waves.
Fill in the blank with the proper word.
A certain X-ray telescope is named after scientist ………..
Fill in the blank with the proper word.
The first scientist to use a telescope for space observationwas ...................
Fill in the blank with the proper word.
The biggest optical telescope in India is situated at ……….
Form pairs
| ‘A’ Groups | ‘B’ Groups |
| (i)X-rays | (a)GMRT |
| (ii)Optical Telescope | (b) ISRO |
| (iii)Indian radio | (c) Hubble telescope |
| (iv)Launching artificial satellites | (d) Chandra |
What are the difficulties in using ground based optical telescopes? How are they overcome?
Which type of telescopes can be made using a concave mirror, convex mirror, plane mirror and a lens? Draw diagrams of these telescopes.
Study the figure and answer the following questions
a. What type of telescope is shown in the figure?
b. Label the main parts of the telescope.
c. Which type of mirror does the telescope use?
d. What other type of telescope uses a curved mirror?
e. Explain the working of the above telescope.
Answer the following question.
Explain the construction of Galileo’s telescope.
Answer the following question.
Explain the construction of a radio telescope.
Answer the following question.
Why are optical telescopes located in uninhabited places on mountains?
Answer the following question.
Why can an X-ray telescope not be based on the earth?
Chapter 18: Observing Space : Telescopes
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 18 - Observing Space : Telescopes
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Concepts covered in Science and Technology 9th Standard Maharashtra State Board chapter 18 Observing Space : Telescopes are Different Forms of Light, Telescope, Indian Space Research Organization (ISRO), Astrosat.
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