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.

CBSE Class 9 - Social Studies - Food Security In India (Q & A) - (#CBSENotes) (#CBSEClass9Notes)

Food Security Of India 

Q & A Based on Class 9 Chapter


Q 1: Why is food security essential?

Answer:
① When the country faces a disaster or calamity like earthquake, flood, drought, tsunami and there is a widespread failure of crops which causes famine, etc. All the sections of society have to face shortage of food. Hence, it is needed to ensure sufficient food.

Bengal Famine Of India
image source: wikiipedia

② A section of people in India still sleeps without food. They have no money to secure two square meals for their family members. Deaths due to starvation have also been reported. Thus food security is needed in a country to ensure food to all people at all times.


Q2: Name the year when a devastating famine occurred in India.

Answer: In 1943, famine of Bengal is the most devastated famine.




Q3: What is food security? What conditions should be fulfilled to ensure food security in a country like India?

OR

What are the dimensions of food security?

Answer: Food security does not mean to get two square meals only but something more than that. Thus, food security in a country is ensured only if the below said conditions are fulfilled.