Chapter 18 Observing Space: Telescopes Solutions

Maharashtra State Board Class 9 Science Solutions Chapter 18 Observing Space: Telescopes

Class 9 Science Chapter 18 Observing Space: Telescopes Textbook Questions and Answers

1. Fill in the blanks with the proper words.

a. The wavelength of visible light is between …………………..….. and …………………..…..
b. GMRT is used for …………………..….. waves.
c. A certain X-ray telescope is named after scientist …………………..…..
d. The first scientist to use a telescope for space observations …………………..…..
e. The biggest optical telescope in India is situated at …………………..…..

2. Form pairs

Answer:
(1 – d),
(2 – c),
(3 – a),
(4 – b),

3. What are the difficulties in using ground-based optical telescopes? How are they overcome?
Answer:
Difficulties:

Solution:

4. Which type of telescopes can be made using a concave mirror, convex mirror, plane mirror, and a lens? Draw diagrams of these telescopes.
Answer:

5. 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:
(a) The Newtonian telescope (Reflecting telescope)
(b)

(c) Concave mirror
(d) The Cassegrain telescope
(e) Working.

6. Answer the following questions.

a. Explain the construction of Galileo’s telescope.
Answer:

b. Explain the construction of a radio telescope.
Answer:

c. Why are optical telescopes located in uninhabited places on mountains?
Answer:

d. Why can an X-ray telescope not be based on the earth?
Answer:

Class 9 Science Chapter 18 Observing Space: Telescopes Intext Questions and Answers

Class 9 Science Chapter 18 Observing Space: Telescopes Additional Important Questions and Answers

Choose and write the correct options:

Match the columns: