Answers
Explanation:
Ex 13.1 Class 9 Maths Question 1.
A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine
(i) The area of the sheet required for making the box.
(ii) The cost of sheet for it, if a sheet measuring 1m2 costs ₹20.
Solution:
(i) Here, length (l) = 1.5 m, bread th(b) = 1 .25 m
and height (h) = 65 cm = 65100 m = 0.65 m
NCERT Solutions for Class 9 Maths Chapter 13 Surface Areas and Volumes Ex 13.1 Q1
∵ It is open from the top.
∴ Its surface area
= [Lateral surface area] + [Base area]
= [2(1 + b)h] + [lb]
= [2(1.50 + 1.25)0.65] m2 + [1.50 x 1.25] m2
= [2 x 2.75 x 0.65] m2 + [1.875] m2
= 3.575 m2+ 1.875 m2 = 5.45 m2
∴ Area of the sheet required for making the box = 5.45 m2
Hope it helps
Answer:
1) The Life of the Nilgiris is beyond words. (use an Abstract noun)
2. Food is essential for human life. (use an Uncountable noun)
3. I had been to New Delhi to visit the Lotus temple which is a famous historical
monument. (use a Proper noun)
4. That volcano is an active one. (Rewrite the sentence in Plural form)
Answer- Those volcanoes are active ones.
5. Do you have Any queries in the project? (much/any)
6. The girl who reported late, is my cousin. (State the kind of Pronoun)
Answer- Who - relative pronoun ; is - personal pronoun.
7. They are stronger than Us (we/us)
8. What assignment are you working on now? (state if the sentence has an Interrogative
Pronoun/Adjective)
Answer- Adjective.
9. I would like to buy a pair of stockings and a couple of shirts too. (use appropriate
article)
10. The food provided at the shelter was substandard. (use appropriate article)
11. He was wearing a pair of smart leather boots. (State the kind of Adjective)
Answer- Smart - Quality ; Leather - Quality
12. I saw the robber with my Own eyes. (use an Emphasising adjective)
13. Priyanka Chopra is a Awarded actress. (use a participial adjective)
14. Each child was given a gift. (State the kind of Adjective)
Answer- Each - Quantity.
15. There is nothing better than a massage to help one relax. (use the comparative degree of
‘good’)
16. I think Brad Pitt is Best actor in Hollywood. (use a suitable superlative adjective)
17. No other metal is as heavy as iron. (rewrite this sentence in Comparative degree
without changing the meaning of the sentence)
Answer- No other metal is heavier than iron.
18. Elephant is the largest terrestrial animal in the world. (rewrite this sentence in Positive
Answer - Elephant is a large terrestrial animal in the world.
degree without changing the meaning of the sentence)
19. The principal was annoyed By me. (use a Preposition)
20. In the situation, I choose to opt for online classes. (use a Participial Preposition)
21. Did you forget your camera Under the table? (use a prepositional phrase)
22. The eagle soared high above. (State if ‘above’ is a Preposition/Adverb)
Answer - Preposition
--------------------------------