CBSE Class 9 Maths - SURFACE AREAS AND VOLUMES (NCERT EXERCISE 13.1) (#cbsenotes) (#ncertsolutions)

SURFACE AREAS AND VOLUMES

Class 9 Maths 

NCERT EXERCISE 13.1

Q1: A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is to be open 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 1 m2 costs Rs 20.

Answer: Given,
l = 1.5 m,
b = 1.25 m,
h = 65 cm = 0.65 m

(i) ∵ the box is open at the top, it has only five faces.

Surface Area (SA) for five faces = lb + 2(bh + hl)

= 1.5 × 1.25 m² + 2 (1.25 × 0.65 + 0.65 × 1.5) m²
= 1.875 + 2 (1.7875) m² = 1.875 + 3.575
= 5.45 m²

(ii) Cost of 1 m² of the sheet = ₹ 20
∴ cost of 5.45 m² of the sheet = 20 × 5.45 m² = ₹ 109 (Answer)


Q2: The length, breadth and height of a room are 5m, 4m and 3m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m².

CBSE Class 10 - Foundation Of Information Technology (FIT)- Marking Scheme of Sample Question Paper (2016-17) (#cbsepapers)

CBSE Class 10 - Foundation Of Information Technology (FIT)- Marking Scheme of Sample Question Paper (2016-17) 

☛See here for FIT Sample Question Paper (2016-17)

CBSE Class 10 - Foundation Of Information Technology (FIT)- Sample Question Paper (2016-17) (#cbsepapers)

CBSE Class 10 - Foundation Of Information Technology (FIT)- Sample Question Paper (2016-17) 

☛See here FIT Marking Scheme of FIT SQP(2016-17)

CBSE Class 9/10/11/12 - English Grammar - Phrasal Prepositions

Phrasal Prepositions

Phrasal (or Phrase) prepositions are group of words which are used as a single preposition.

e.g. Manoj couldn't succeed on account of his negligence.

Here 'on account of' is a phrase preposition which means 'for' (reason).

Here is a partial list of phrasal prepositions:

according to
along with
agreeably to
away from
because of
by dint of
by means of
by reason of
by virtue of
by way of
conformably to
for the sake of
in accordance with
in addition to
in (on) behalf of
in case of
in comparison to
in compliance with
in consequence with/of
in course of
in favour of
in front of
in lieu of
in order to
in place of
in reference to
in regard to
in spite of
instead of
in the event of
on account of
owing to
with a view to
with an eye to
with regard to
with reference to

CBSE Class 12 - Hindi (हिन्दी ऐच्छिक )- Marking Scheme Sample Question Paper (2016-17)

CBSE Class 12 - Hindi (हिन्दी ऐच्छिक
)- Marking Scheme Sample Question Paper (2016-17) 


☛See Hindi Sample Question Paper (2016-17)

CBSE Class 12 - Hindi (हिन्दी ऐच्छिक )- Sample Question Paper (2016-17)

CBSE Class 12 - Hindi (हिन्दी ऐच्छिक
)- Sample Question Paper (2016-17) 


☛See Marking Scheme of Hindi Sample Question Paper (2016-17) 

CBSE Class IX - History - CHAPTER 4 - FOREST SOCIETY AND COLONIALISM (Q and A) (#cbseclass9Notes)

FOREST SOCIETY AND COLONIALISM

Questions and Answers based on NCERT Chapter


Q1: What is deforestation?

Answer: Deforestation is cutting down of trees indiscriminately in a forest area. Under the colonial rule it became very systematic and extensive.


Q2: Who were the colonial power in Indonesia?

Answer: Dutch


Q3: Why is deforestation considered harmful?

Answer: Forests give us many things like paper, wood that makes our desks, tables, doors and windows, dyes that colour our clothes, spices in our food, gum, honey, coffee, tea and rubber. They are the natural habitat of animals and birds. Forests check soil erosion and denudation, sand dunes. They preserve our ecological diversity and life support systems.
Cutting down forest extensive will deprive us the above said benefits. Thus deforestation is considered harmful.


Q4: Who were ‘Kalangs’ of Java?

Answer: They were skilled forest cutters and shifting cultivators