## Tuesday, July 31, 2012

### CBSE - Class 10- Science Proficiency Test Paper (2012) - Set-A

Class 10 - Science Proficiency Test Paper 2012 (Set-A)

(See Answer key at the end.)

### CBSE - Class 10 - Proficiency Test Paper- Maths (Set-A)

Class 10 - Maths Proficiency Test Paper (Set-A)

(See Answer key at the end.)

### CBSE Class 9 - Science - CH9 - Force and Laws of Motion (worksheet)

 Isaac Newton
Force and Laws of Motion
Worksheet
Fill in the blanks

1. The study of motion of a body under the action of a force is called ______.

2. (Impulse/Force/Pressure) ______ is a push or pull acting upon an object.

3. The natural tendency of objects to resist a change in their state of rest or of uniform motion is called ______.

## Monday, July 30, 2012

### CBSE Class 9 - Science - CH6 - Tissues (Worksheet)

Tissues
(Worksheet)
 Cardiac Musclecredits:  Ijsbrand Kramer , University of Bordeaux

Fill in the blanks

1. ___________  is the process by which unspecialised structures become modified and specialised for performing specific functions.

2. Differentiation results in ________ (division/ summation/integration) of labour.

3. The study of the structure of tissues and organs is known as ______ .

4. Based on ability to divide, plant tissues may be classified as ________ and _____ tissues.

## Saturday, July 28, 2012

### CBSE Class 11: Chemistry - CH1 - Laws of Chemical Combinations

 Antoine Lavoiser credits:wikipedia
Laws of Chemical Combinations

Q1: List the laws that are collectively called Laws of Chemical combinations.

1. Law of Conservation of Mass
2. Law of Constant composition
3. Law of Multiple proportions
4. Law of reciprocal proportions
5. Law of Combining Volumes (Gay Lussac's law of Gaseous Volumes)

### CBSE Class 9 - Maths - Ch6 - Lines and Angles (Set-2)

 Octahedron
Lines and Angles: Q & A

Q1: Prove that two lines which are both parallel  to the same line, are parallel to each other.

Given: Three lines l, m, n in a plane such that l || m and m || n.

## Friday, July 27, 2012

### CBSE Class 11 - Chemistry - CH1 - Mole Concept

Q1: Define mole

Answer: A mole (or mol) is defined as the amount of substance which contains equal number of  particles (atoms / molecules / ions) as there are atoms in exactly 12.000g of carbon-12.

One mole of carbon-12 atom has a mass of exactly 12.000 grams and contains 6.02 × 1023 atoms.

A mol is just a number like a dozen. A dozen equals to 12 eggs , a gross of Pencil equals to 144 Pencil. Similarly, mol is equal to 6.022 × 1023(Avagadro constant). Mol is also known as chemist dozen.

## Thursday, July 26, 2012

### CBSE Class 8 - Science - Ch4 - Metals and Non-Metals

Metals and Non-Metals
NCERT Chapter Solutions

Q1. Which of the following can be beaten into thin sheets?
(a) Zinc
(b) Phosphorus
(c) Sulphur
(d) Oxygen

Answer: (a) Zinc, as it is a metal. Rest of these are non metals.

Q2. Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Generally, metals are ductile.
(d) Some non-metals are ductile.

Answer: (c) Generally, metals are ductile.
Mercury (metal) is liquid at room temperature and cannot be drawn into wires. Therefore, it is non-ductile.

### NTSE examination shifts to class 10

NCERT announced the date of NTSE examination for class 10. Earlier the examination was conducted for students of standard 8.
Stage I (State)
Last Date for Submission of Application Form                             - 31st August, 2012

Examination in Mizoram, Meghalaya, Nagaland and
Andaman and Nicobar Islands                                                       - 17th November, 2012 (Saturday)

Examination in All other States and                                               - 18th November 2012 (Sunday)
Union Territories

Stage II (National)
Examination in All States and Union Territories                           - 12th May, 2013 (Sunday)

## Wednesday, July 25, 2012

### CBSE - Class 9 - Science - CH8 - Motion (WorkSheet)

Class 9 - Ch8 - Motion
Fill in the blanks

1. If the position of an object does not change with time, it is said to be at _____.

2. Rest and Motion are ___________ (absolute/relative) terms

3. The study of motion without taking into account the cause of motion is called ______ (kinematics/dynamics).

4. An object is said to be at ________ (rest/motion),  if it changes its position with respect to its surroundings in a given time

### Class 9 - Maths - History of Indian Mathematics - MCQs

 Aryabhatta - statute at University of Astrophysics at Puneimage credits: wikipedia
History of Indian Mathematics - MCQs
(Questions taken from MP Board Question bank for class 9.)
(Answers are provided at the end)

Q1: Main branch of Mathematics is :
(a) Arithmetic
(b) Algebra
(c) Geometry
(d) Accountancy

Q2: Which is the base of scientific development?
(a) Physics
(b) Chemistry
(c) Mathematics
(d) None of these

## Tuesday, July 24, 2012

### One Word Substitution (English Grammar)

One Word Substitution

In competitive examinations (BITSAT, NDA, University Graduate entrance...), often there are questions on 'one word substitution'. Here is a list to help you.

One word substitution is also important to write or speak something very precisely. Class 10 grammar has a topic 'Avoid repetition' covering about it.

1. Anarchist: One who promotes revolt against government.
2. Convalescent: One who is recovering from illness.
3. Omnipotent: One who is all powerful.
4. Omnipresent: One who is present everywhere.

## Monday, July 23, 2012

### CBSE Class 11 - Physics - CH2 - Error Analysis

Error Analysis

Q1: Define error.

Answer: The exact  measurement of a physical quaintly not possible. This is known as Heisenberg uncertainly principle. Uncertainty in the measurements is called error.

Numerically, the deviation of measured value from the actual value is called error.  If X is the quantity measured, then Î”X is called error in X. i.e. Error = Actual value - Measured value.

## Sunday, July 22, 2012

Q1 (CBSE 2011 Class 9 Exam): Read the passage carefully.

It is about nine in the morning and a scraggly bunch of kids is waiting near an abandoned building in Lodhi Colony for their school to arrive. School is a bright yellow bus kitted out with cabinets, blackboard, water dispenser, ladder, a canopy, teaching aids and an LCD TV.  They call it the Mobile Learning Centre or school-on-wheels. When the bus arrives, it parks parallel to the pavement, the television is turned to face the road and an inspirational song, is played loud enough to draw the attention of children.

### CBSE Class 10 - English (Comm.) Workbook - AVOIDING REPETITION

Unit 9 - AVOIDING REPETITION

A. Notice the element of repetition in the following sentences and decide whether it is acceptable or not. Give reasons in support of your opinion.

SentenceOpinion
1. Democracy is the government of the people, by the people, for the people. Its a famous quote, otherwise 'the people' is repeated.
(Acceptable)
2. "I want to scale Mt. Everest, I want to do scuba diving and I want to fly an aeroplane. Actually, I want to do a lot of things before I die."'I want' is repeated number of times.
(Not Acceptable)
3. New Delhi has many big, big malls.'big' is repeated.
(Only acceptable in spoken English)
4. In this article first I have tried to discuss the various causes of air pollution. Then I have tried to discuss the various effects of air-pollution and finally I have tried to discuss various ways to reduce the amount of air-pollution.

## Saturday, July 21, 2012

### Branches of Biology

 Eye of Jumping Spider Photo by Thomas Shahan; Source: Flickr
Branches of Biology

1. Biology: study of  living organisms.

2. Botany:  study of plants.

3. Zoology: study of animals.

4. Morphology: study of internal and external structures of organisms (plants and animals) organs.

5. Histology: study of tissues.

## Friday, July 20, 2012

### CBSE Class 9 - Maths - Ch6 - Lines and Angles

Understanding Basic Terms.
Fill in the Blanks

1. A point, a line and a plane are' basic concepts of geometry. These terms are _____ (well defined/undefined).

2. A line with two end points is called a _________ (line-segment/ ray).

3. A terminated line can be produced ________ (within defined limits/indefinitely).

4. A part of a line with one end point is called a _____ (line-segment/ray).

## Thursday, July 19, 2012

### CBSE Class 7 - Our Pasts-II - Ch2 - New Kings and Kingdoms

New Kings and Kingdoms

Q1: Locate the Gurjara-Pratiharas, Rashtrakutas, Palas, Cholas and Chahamanas (Chauhans) etc. Can you identify the present-day states over which they exercised control?

DynastyPresent Day States
Chahamanas
(Chauhans)
East Rajasthan, Parts of Gujarat, Delhi, Haryana
PalasBengal, Parts of Bihar, North East part of India
KalingaOrissa and parts of Bihar

## Acids, Bases and Salts

 credits:clker.com
MCQs, NCERT Solutions, Q & A

Q1: The most commonly used indicator in laboratory is
(a) Methyl Orange
(b) Litmus
(c) Phenolphtalein
(d) Universal Indicator

Q2: Olfactory indicators are:
(a) Clove
(b) Turmeric
(c) Soap
(d) Rose Petals

## Tuesday, July 17, 2012

### CBSE - Class 8 - Maths - Cubes and Cube Roots

Important Points
& NCERT Solutions

1. If n is a perfect cube then n = m3 or m is the cube root of n. i.e. (n = m × m × m)

2. A cube root is written as ∛n or n1/3.

3. ∛2, ∛3, ∛4 etc. all are irrational numbers.

4. The cube root of negative perfect cube is negative. i.e.
(-x)3=  -x3

## Monday, July 16, 2012

### CBSE - Class 9 - CH2 - Is Matter Around Us Pure

Q1: On the basis of composition, how matter is classified?

• Pure Subtance
• Mixture

Q2(NCERT): What is meant by a pure substance?

Answer: A sample of matter containing only one substance is called a pure substance. In other words all constituents of the substance are same in their chemical nature.

## Sunday, July 15, 2012

### SYNONYMS (Quiz)

SYNONYMS

Each of the following consists of a word in capital letters followed by four words or groups of words. Select the words or group of words that is most similar in meaning to the word in capital letters.
(Taken from various competitive examinations like NDA, CDS, University graduate entrance, TET ...)

1. GENIAL
(a) Generous
(b) Wonderful
(c) Liberal
(d) Friendly and cheerful

## Friday, July 13, 2012

### CBSE Class 9 English (C) - Unit 4 - MODALS

 src:wpclipart.org
Unit 4 - MODALS

A. Ability
1. What are the ten different ways in which you can use a ruler other than its regular use? List your answer below.

e.g. You can use it to dig holes.

## Thursday, July 12, 2012

### Watch Wonders of The World

Google initiated a new education project called Word Wonders Project. It offers various monumental sites of historical, architectural and natural interest. It includes monuments, memorials, cathedrals, castles, landscapes.

Along with 3D street view there is ample of information available to enrich your knowledge. The only caveat is, currently no Indian site is covered. Hope we shall see it very soon.

### CBSE Class 9- CH5: Introduction to Euclid's Geometry

 Fragment of Euclid's Elements source: wikicommons
NCERT Chapter Solutions
and Other Q & A

Exercise 5.1

Q1: Which of the following statements are true and which are false? Give reasons for your answers.
(i) Only one line can pass through a single point.
(ii) There are an infinite number of lines which pass through two distinct points.
(iii) A terminated line can be produced indefinitely on both the sides.
(iv) If two circles are equal, then their radii are equal.
(v) As shown in Fig. below, if AB = PQ and PQ = XY, then AB = XY.

## Wednesday, July 11, 2012

### Plurals with Different Meanings

Some Nouns have same meaning in singular form but have different meanings in plural form.

A few are listed here:

Colours:
1. Hues
2. Regiment (unit of army)
Compasses:
1. Magnetic compasses used for navigation
2. Instruments used in geometry

## Tuesday, July 10, 2012

### How to learn naming Chemical Formulae?

 Chemicals (src:deviantart)
Nomenclature of Simple Inorganic compounds.

1. A formula is a shorthand notation used to identify the composition of a molecule or compound.

2. For example chemical formula of water is H2O. It includes the symbol of each element (e.g. Hydrogen:H and Oxygen:O)  in the molecule, along with numerical subscripts to show how many atoms of each element are present.

3. Most of the inorganic compounds are binary compounds i.e. it consists of two elements. Some are ternary i.e. contain more than two elements.

## Sunday, July 8, 2012

### NTSE SAT Quiz-13 (Maths) / Class 8 Maths

NTSE SAT Quiz-13 (Maths)

Q1: One third of a number is greater then one fourth of its successor by 1, find the number.

(a) 5
(b) 15
(c) 20
(d) 25

## Friday, July 6, 2012

### Class 11 - Physics - CH3 - Motion In a Straight Line (Part-2)

 Motion in straight line! (source:clker.com)

### NCERT Chapter Solutions (Q14-onwards)

For Questions (1-13) see page.
Q 3.14: A man walks on a straight road from his home to a market 2.5 km away with a speed of
5 km/hr. Finding the market closed, he instantly turns and walks back home with a speed of
7.5 km /hr. What is the
(a) magnitude of average velocity, and
(b) average speed of the man
over the interval of time
(i) 0 to 30 min,
(ii) 0 to 50 min,
(iii) 0 to 40 min ?
[Note: You will appreciate from this exercise why it is better to define average speed as total path length divided by time, and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero !]

### Class IX- English(Comm.) - INTEGRATIVE GRAMMAR PRACTICE 2

INTEGRATIVE GRAMMAR PRACTICE 2

1. Look at the notes given below and complete the paragraph that follows by choosing the correct options from the choices given below. Write the correct options in your answer sheet against the correct blank numbers.

Kalakshetra - cultural academy - preserves - Indian art - founded in 1936 - internationally recognized Indian Parliament Act - institution of national Importance.

Kalakshetra is a cultural academy dedicated to (a)_______________ especially Bharathanatyam. The academy (b) ___________________ Arundale and under her guidance the institution achieved (c) ______________ for its unique style and perfection. In 1993 an (d) _____________ recognized the Kalakshetra foundation as an institution of national importance.

## Coordinate Geometry - Important Points

1. Each point on a number line is associated with a number called its coordinate.

2. Each point on a plane is associated with an ordered pair (x,y) of numbers called its coordinates.

### NTSE (Science) Quiz-12/Science & Technology Objective Test (Haryana Board)

Science & Technology Objective Test (Haryana Board)/
NTSE Sample Quiz-12 (Science) /Class 8 Science

Q1. Atomic number of sodium is 11 and number of neutrons is 12, then atomic mass will be
(a) 12
(b) 22
(c) 11
(d) 23

Q2: Which original particle of atom contains negative charge?
(a) On nucleus
(b) On proton
(c) On neutron
(d) On electron

## Wednesday, July 4, 2012

### Class 6 - Science - CH4 - Sorting Materials into Groups

Ever wonder how mails are sorted and posted. Watch this video (source: you tube)

Q1: Name five objects which can be made from wood.
1. Chair
2. Table
3. Plough,
4. Bullock cart and its wheels
5. Door

## Monday, July 2, 2012

### Unit 3: Future Time Reference (CBSE Class 9 English Comm. Workbook)

2. Look at sentences in Column A. Match them with the appropriate explanation in Column B.
AB
1. Next Friday is the 29th of May.      a. emphasizing that something will happen very soon
2. I'll have left by the time you get here.    b. making a promise
3. I'm visiting my uncle on Sunday.c. predicting that something will be
true at a given time in the future
4. I'll send the photographs as soon as I can.    d. stating something which is a certainty
5. The lesson is about to start… hurry!e. reporting a decision made earlier
6. The population of our country will
increase in the next ten years.
f. making a prediction about future events.

Answer: 1-d, 2-c, 3-e, 4-b, 5-a, 6-f

## Sunday, July 1, 2012

### Objective Test

Q1: Fill in the blanks

a. The process of ________ causes cooling.
b. The process of cooling glass is known as ____.
c. Liquids have no fixed ______ but have fixed _____.
d. ____ exists in all three states of matter.
e. Carbon dioxide is a white solid called _____ at temperature below ______.

### Integrated Grammar Practice 4 - (CBSE Class 10 English Comm Workbook)

Integrated Grammar Practice 4

1. Given below are Reena's notes from her trip to Fatehpur Sikri. Use this information to complete the paragraph by choosing the correct options.

Imperial city of Mughal empire between 1571-1584-built by Mughal emperor Akbar-buildings blend of Islamic and Hindu styles-general layout and concept: Islamic-actual buildings show Hindu influence especially Gujarat and Rajasthan

Fatehpur Sikri (a) ________________ Mughal dynasty between 1571 and 1584. It (b)__________  Akbar, and is one of a kind. The buildings within Fatehpur Sikri (c) ________________________ architectural traditions.
Though the general layout of the buildings (d) _______________________, the actual buildings (mainly palaces), their ornate columns, arches, carving style, etc. (e) ________________________ Gujarat and Rajasthan.