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

CBSE Class 12 - Computer Science- Marking Scheme of Sample Question Paper (2016-17) (#cbseclass12papers)

CBSE Class 12 - Computer Science- Marking Scheme of Sample Question Paper (2016-17) 


☛ Click here for Comp. Science Sample Question Paper (2016-17)

English Grammar - Commonly Used Latin Phrases You Must Know (#cbsenotes)

Commonly Used Latin Phrases 

You Must Know

Ad hoc:  for this

Ad referendum: For further consideration

In Absentia: While Absent

Mea Culpa: By my fault

Tempus Fugit: Time Flies

Prima Facia: On first view

Caveat Emptor: Let the buyer beware

CBSE Class7 - Our Pasts-II - THE MAKING OF REGIONAL CULTURES (#cbseclass7Notes)

THE MAKING OF REGIONAL CULTURES

Lord Jagganath, Subhadra and Balbhadra
image credits:wikipedia 

Q & A based NCERT Chapter

Q1: Who were the rulers of Mahodayapuram in Ninth century? Presently it belongs to which Indian state?

Answer: The Chera rulers established Mahodayapuram in Ninth century. It is part of Kerala now.


Q2 (NCERT): Match the following:

Anantavarman	Kerala
Jagannatha	Bengal
Mahodayapuram	Orissa
Lilatilakam	Kangra
Mangalakavya	Puri
Miniature	Kerala

Answer:

Anantavarman	Orissa
Jagannatha	Puri
Mahodayapuram	Kerala
Lilatilakam	Kerala
Mangalakavya	Bengal
Miniature	Kangra

Q3: Name the rulers who introduced the Malayalam language and script in their inscriptions for the first time.

Answer: Chera rulers

CBSE Class 12 - Computer Science- Sample Question Paper (2016-17) (#CBSEClass12Papers)

CBSE Class 12 - Computer Science- Sample Question Paper (2016-17) 


☛ Click here for Marking Scheme of Com. Sci SQP (2016-17)

Class 8/ Class 9 - Properties Of Quadrilateral Figures (Worksheet) (#CBSEClass8Maths) (#CBSEClass9Maths)

Properties Of Quadrilateral Figures

(Worksheet)

Question. Fill in the blanks (True or False) for the properties of the following figures:

Property	Parallelogram	Rhombus	Rectangle	Square
1. Both pairs of opposite sides are parallel and equal.	?	?	?	?
2. Both pairs of opposite angles are equal.	?	?	?	?
3. Diagonals bisect each other.	?	?	?	?
4. Diagonals are equal.	?	?	?	?
5. Each angle is 90°	?	?	?	?
6. Diagonals intersect at right angles.	?	?	?	?
7. All sides are equal.	?	?	?	?

CBSE Class 10 - French- Sample Question Paper (2016-17) (#CBSEPapers)

CBSE Class 10 - French- Sample Question Paper (2016-17) 

CBSE Class 8 - Maths - Comparing Quantities (Worksheet) (#CBSENotes)

Comparing Quantities

Worksheet

Class 8  NCERT Exemplar Chapter Answers

In the following questions, fill in the blanks to make the statements true.

1. _________ is a reduction on the marked price of the article.

2. Increase of a number from 150 to 162 is equal to increase of _________ per cent.

3. 15% increase in price of an article, which is Rs 1,620, is the increase of Rs _________.

4. Discount = _________ – _________.

5. Discount = Discount % of _________.

6. _________ is charged on the sale of an item by the government and is added to the bill amount.

CBSE Class 9 - Science - Structure Of Atom (Question Bank) (#CBSENotes) (#CBSEClass9Science)

Structure Of Atom

(Question Bank)

Questions Based on Class 9 NCERT Science Chapter

Q.1: Define atomic number.

Q.2: What is an electron? Who discovered it?

Q.3: Name the particles which determine the mass of an atom.

Q.4: Study the composition of the two nuclei of two atomic species L and M
L = protons 20, neutrons 20
M = protons 18, neutrons 22
Give the relation between the two.

Q.5: Write the formula for calculating the maximum number of electrons in an orbit.

Q.6: Name the particles that have no charge and their mass is equal to that of proton. Who discovered these particles?

Q.7: What is charge/mass ratio of an electron?

Q.8: What is the valency of oxygen [Atomic number of oxygen=8]?

Q.9: Write the notation of an atom ‘X’, if the mass number is A and the atomic number is Z.

CBSE Class 12 - English (Core)- Marking Scheme Sample Question Paper (2016-17)

CBSE Class 12 - English (Core)- Marking Scheme Sample Question Paper (2016-17) 

Check the Sample Question Paper (2016-17)

CBSE Class 8 - Mathematics - Direct and Inverse Proportions

Direct and Inverse Proportions

CBSE Class 8 - Mathematics

NCERT Exemplar Problems and Solutions


Q1: If x and y are directly proportional and when x = 13, y = 39, which of the following is not a possible pair of corresponding values of x and y ?

(a) 1 and 3
(b) 17 and 51
(c) 30 and 10
(d) 6 and 18

Answer: (c) 30 and 10
For direct variation,

x1	=	x2
y1		y2

Thus x/y = 13/39 = 1/3. Options (a), (b) and (d) have the same ratio while option (c) does not.


Q2: Which of the following is in direct proportion?

(a) One side of a cuboid and its volume.
(b) Speed of a vehicle and the distance travelled in a fixed time interval.
(c) Change in weight and height among individuals.
(d) Number of pipes to fill a tank and the time required to fill the same tank.

Answer: (b) Speed of a vehicle and the distance travelled in a fixed time interval.
∵ Speed / distance = fixed ratio.


Q3: Both u and v vary directly with each other. When u is 10, v is 15, which of the following is not a possible pair of corresponding values of u and v?

(a) 2 and 3
(b) 8 and 12
(c) 15 and 20
(d) 25 and 37.5


Answer: (c) 15 and 20
u/v = 2/3
Option (C) does not maintain the same ratio.

CBSE Class 9 - Mathematics - CH 11 - Constructions - Very Short Questions and Answers (#CBSEClass9Notes)

Constructions

Very Short Questions and Answers
Based NCERT Class 9 Mathematics Chapter


Q1: With the help of ruler and compass, which of the following angles can be constructed?

(a) 35°
(b) 40°
(c) 37.5°
(d) 15°


Answer:  37.5° and 15° angles can be constructed using a ruler and a compass.


Q2(NCERT Exemplar): With the help of a ruler and a compass it is not possible to construct an angle of :

(A) 37.5°
(B) 40°
(C) 22.5°
(D) 67.5°

CBSE Class 12 - English (Core)- Sample Question Paper (2016-17) (#CBSEClass12Papers)

CBSE Class 12 - English (Core)- Sample Question Paper (2016-17) 

Check Marking Scheme of Eng Core Sample Question Paper (2016-17)

Class 12 - English (Core) - An Elementary School Classroom in a Slum - Extract Based Questions

An Elementary School Classroom in a Slum 

Extract Based Questions

Class 12 - English (Core)

Question(CBSE 2013 comptt):

Surely, Shakespeare is wicked, the map a bad example,
With ships and sun and love tempting them to steal—
For lives that slyly turn in their cramped holes
From fog to endless night? On their slag heap, these children
Wear skins peeped through by bones and spectacles of steel
With mended glass, like bottle bits on stones.

Q1: Why is the map called a bad example?

Q2: Why is Shakespeare described is wicked?

Q3: Where do the children spend their lives?

Q4: What does the reference to 'slag heap' mean?

Q5: What do 'fog' and 'endless night' stand for?


Answers:

1: The map is a bad example because it does not depict their own world of narrow lanes and hovels.

2: Shakespeare is described as wicked because any learning about him makes no sense for the children. They are troubled by hunger, despair and failed aspiration, learning about Shakespeare would not make their lives any better.