Wednesday, August 17, 2016

CBSE Class 9 English - Unit 6 - The Brook (Questions and Answers)

The Brook 

CBSE Class 9 English - Unit 6 - The Brook (Questions and Answers)

(Questions and Answers asked in exam papers in previous years.)


Q1: Where does the the brook come from? Where is it destined to be?


Answer: The brook starts its journey from dwelling place of birds (such as coot and hern) in the hills. Finally it flows into the overflowing river.


Q2: What is the message of the poem about life?

Answer: The poem tells that life is eternal.


Q3: How does the brook behave at the origin?

Answer: At the origin, the brook is happy, bubbly and full of noise like a small child.


Q4: Who is the poet of poem 'The Brook'? What parallelism does he draw in his poem?

Answer: Alfred Lord Tennyson is the poet. He draws a parallelism between the journey of the brook with the life of a man.

widgets for blogger

Sunday, August 7, 2016

CBSE Class 9 - Lines and Angles (Worksheet-2)

Lines and Angles (Worksheet-2)

CBSE Class 9 - Lines and Angles (Worksheet-2)

Question: Fill in the blanks

1. Three or more points said to be __________ if there is a line which contains all these points.


2. Two lines are called ___________ lines, if they have common point.


3. Three or more lines intersecting at the same point are called as ____________ lines.


4. An angle whose measure is less than 90° is called _________ angle.


5. An angle whose measure is 90° is called _________ angle.


6. An angle whose measure is more than 90° but less than 180°, is called _______ angle.

Wednesday, July 27, 2016

CBSE 6 - 12 - English Grammar - Kinds Of Sentences (Part 2)

KINDS OF SENTENCES (Part 2)

Class (6 - 12) English Grammar - KINDS OF SENTENCES (Part 1)


You may see the first post on Kinds Of Sentences (Part-1)

Based on forms, sentences are of three types:

➊ Simple Sentences

➋ Compound Sentences

➌ Complex Sentences

Simple Sentence: A simple sentence has one subject, one predicate or finite verb.
e.g.

Rosy runs very fast.

They run very fast.

My friend is very intelligent.

Gold and Platinum are precious metals.

The train was late.

In the above sentences, words in black boxes are subjects while words in green boxes are predicates. See above the sentence "Gold and Platinum...", a conjunction is used to make a single subject.

Compound Sentences: In such sentences two or more co-ordinate clauses (independent of each other) are joined by a conjunction.

Examples are:
❶ Clouds appeared and it became to rain.

❷ You may stay or you may leave.

❸ I waited for the train, but it was late.

❹ The girls went to the disco but did not go to the cinema.

Thursday, July 14, 2016

CBSE Class 8 - Science - COMBUSTION AND FLAME (HOTS Questions and Answers)

COMBUSTION AND FLAME

CBSE Class 8 - Science - COMBUSTION AND FLAME (HOTS Questions and Answers)
Forest Fires - Why do forests catch fire in hot summers?

HOTS Q & A (Class 8 Living Science Textbook Chapter Solutions)


Q1: Only gases burn with a flame. When you burn wood it initially burns with a flame. Later it only glows without a flame. What do you think the answer is?

Answer: Wood contains many chemicals like resin, lignin. When heated, these chemicals broke up and release combustible gases. That's why wood burns initially with a flame. When these gases are exhausted, wood burns without flame.


Q2: Would you consider coal as a good fuel? Give reasons?

Answer: Coal is not considered as a good fuel because of the following reasons:

1. It has low calorific value as compared to Petroleum and LPG.

2. On burning it releases many polluting gases like CO2 which is a green house gas and it causes global warming.

3. Coal contains traces of Sulphur and Nitrogen which on burning gives harmful gases like Nitrogen Oxide and Sulphur Oxide. These gases when mixed with rain water cause acid rain.

4. Unburnt traces of carbon also causes respiratory problems.


Q3: When a fuel is burnt, carbon dioxide (or carbon monoxide) and water vapour are given out. Can you name one fuel which burns without giving off water vapour? Why does it not give out water?

Answer: Charcoal is pure form of carbon. When it burns with oxygen, it forms carbon dioxide and no waters vapours are given off.


Q4: Why does a matchstick burn on rubbing it on the side of the match box?

Answer: Matchstick uses chemicals like phosphorus which has low ignition temperature (35°C). When the stick is rubbed, due to friction heat is generated which is sufficient to raise temperature to above 35°C and ignites the stick.

Sunday, July 3, 2016

CBSE Class 8 - Science - MICROORGANISMS AND VIRUSES – Friends and Foes! (Q and A)

MICROORGANISMS   AND VIRUSES – Friends and Foes!

(Chapter Solutions of text book Prachi Science for Class 8)

CBSE Class 8 - Science - MICROORGANISMS   AND VIRUSES – Friends and Foes! (Q and A)
Fungal Infected Bread


Q1.  Answer in one word.

1. Name two typical habitats of micro-organisms

Answer: Commonly found everywhere – in air, in water, inside the bodies of living organisms.

2. Name a disease caused by bacteria

Answer: Tuberculosis, Pneumonia

3. Name the microorganism that is used for obtaining alcohol from sugar.

Answer: Yeast.

4. Name one carrier of disease – causing microorganisms.

Answer: House Fly which causes many diseases like cholera, typhoid, diarrhoea.


5. Where do the external parasites of animals live?

Answer: External parasites like lice, flies, ticks, grubs etc. live on the skins of the animals.


Q2. Short- Answer Questions (10-15 words)

Wednesday, June 22, 2016

CBSE Class 9 - Chemistry - CH2 - Is Matter Around Us Pure? (Short Q and A)

Is Matter Around us pure?

Short Q & A

CBSE Class 9 - Chemistry - CH2 - Is Matter Around Us Pure? (Short Q and A)
Simple Distillation Technique.
Can you name the labelled parts? See answer at wikimedia


Q1: Who was the first scientist to use the term 'element'?

Answer: Robert Boyle was the first scientist to use the term element in 1661.


Q2: Name the chemist who for the first time, defined an element as a basic form of matter that cannot be broken down into simpler substances by chemical reactions.

Answer: Antoine Laurent Lavoisier (1743-94), a French chemist


Q3: Who is known as the father of Modern Chemistry?

Answer: Antoine Laurent Lavoisier (1743-94), a French chemist


Q4: Do physical changes alter the identity of a substance?

Answer: No.


Wednesday, June 15, 2016

Class 8 - Maths - Algebraic Expressions and Identities (NCERT Ex 9.2 Answers)

Algebraic Expressions and Identities 


(NCERT Ex 9.2 Answers)


Class 8 - Maths - Algebraic Expressions and Identities (NCERT Ex 9.2 Answers)

Q1: Find the product of following pair of monomials.

(i) 4 , 7p


Answer:

4   ☓   7p = 4  ☓ 7   ☓ p = 28p

(ii) -4p , 7p

Answer:

-4p   ☓   7p = -4 ☓ p ☓ 7  ☓ p = (-4☓7)☓ (p☓ p) = -28p2

(iii) 4p , 7pq

Answer:

-4p  &#9747 7p = -4 ☓ p ☓7  ☓ p  ☓ q = (-4☓ 7)☓ (p☓ p☓ q) = -28p2q

(iv) 4p3 , -3p

Answer:

4p3  ☓  -3p = 4  ☓(-3)   ☓ p ☓ p☓ p☓ p = -12p4

(v) 4p , 0

Answer:

4p ☓ 0 = 4☓ p☓ 0 = 0


Q2: Find the areas of rectangles with the following pairs of monomials as their lengths
and breadths respectively.

(p , q);(10m , 5n);(20x2 , 5y2);(4x , 3x2);(3mn ,4np)


Answer:

We know that,

Area of rectangle = Length ☓ Breadth

Area of 1st rectangle = p ☓ q = pq

Area of 2nd rectangle = 10m ☓ 5n = 10☓ 5 ☓ m ☓ n = 50mn

Area of 3rd rectangle = 20x2 ☓ 5y2 = 20☓ 5 ☓ x2 ☓ y2 = 100x2y2

Area of 4th rectangle = 4x ☓ 3x2 = 4☓3 ☓ x ☓ x2 = 12x3

Area of 5th rectangle = 3mn ☓4np = 3☓ 4 ☓ m ☓ n ☓ n ☓ p = 12mn2p


Q3: Complete the table of products.

First Monomial (⇨)
Second Monomial(⇩)
2x -5y 3x2 -4xy 7x2y -9x2y2

2x 4x2 ... ... ... ... ...
-5y ... ... -15x2y ... ... ...
3x2 ... ... ... ... ... ...
-4xy ... ... ... ... ... ...
7x2y ... ... ... ... ... ...
-9x2y2 ... ... ... ... ... ...


Answer: