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        • Reaching the Age of Adolescence
        • Conservation of plants and animals
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        • Rational Number
        • Square and Square Roots
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        • Factorization
        • Exponent and Power
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        • Profit and Loss
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VI–SCIENCE WORKSHEET:Getting To Know Plants 

31/7/2012

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16 Comments

X Maths :Linear Equation of Two Variable: Exam Questions

28/7/2012

1 Comment

 

CBSE X Mathematics: Linear Equations in two  Variables

Linear Equations in two  Variables MCQ’ Test -1

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Linear Equations in two  Variables Test paper-2 

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Linear Equations in two  Variables Test paper-3 

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Linear Equations in two  Variables Test paper-4 

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Linear Equations in two  Variables Test paper-5

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Linear Equations in two  Variables Test paper-6 

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Linear Equations in two  Variables   MCQ's -7

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Linear Equations in two  Variables   MCQ's -8

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CBSE 6th:Living things and Habitat and Adaptation

25/7/2012

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Fill in the blanks : Chapter:Habitat

(i)In the sea plants and animal surrounded by -------------------------(saline water) 

(ii) The place where living beings live is called their -------------(Habitat) 

(iii) In Cactus plant, ---------------are reduced to spines (Leaves) 

(iv) Global warming increases the concentration of ------in the atmosphere(carbon dioxide) 

(v) ------------are examples for Decomposers (Bacteria and fungus) 

(vi) Living component of a habitat is called as -------------- (Biotic) 

(vii) Anything which produce and response in an organism is called as -----------(Stimulus) 

(viii) A potted plant is kept in a card board box with a small slit of sun light exhibits ----- Movement (Phototrophic)  
(25 questions total)
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11th Physics Chapters notes and Sample paper

21/7/2012

9 Comments

 
                                CBSE TEST PAPER -2012-13
 Time: 1hr.  CHAPTER: MAGNETIC EFFECT OF CURRENT             FM: 30
1. A positively charged particle (alpha-particle) projected towards west is deflected towards north by magnetic field. The direction of magnetic field is          
(a) towards south (b) towards east (c) downward (d) upward.
2. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each   
(a) two revolutions (b) one revolution (c) half revolution (d) one-fourth revolution.
3. Permanent magnets are made up of
(a) Alnico     (b) soft iron  (c) copper (d) aluminum.                            
4. Which of the following properties of a proton can change when it moves freely in a magnetic field
(a) Mass              (b) speed              (c) velocity                 (d) momentum
5. The direction of the magnetic field at a point P above the wire carrying current is
(a) Down the page   (b) up the page      (c) into the page      (d) out of the page
6. An alternating current has frequency of 50 Hz. How many times does it change its direction in one second?
7 . What is the advantage of the third wire of earth connection in domestic appliances?
8.  What is the S.I. unit of magnetic flux ?
Ans:  Weber : The magnetic flux linked with a surface is defined as the number of magnetic field lines passing normally through that surface.
9 . How can we increase the speed of a D.C. motor?
10. Why do not two magnetic field lines intersect each other?
11. What is a solenoid? Draw magnetic field lines showing the magnetic field inside and outside the current carrying solenoid?
12. (a) What is short circuiting? (b) What is overloading? How can you avoid overloading?
13. What are the ways to detect the polarity of a current carrying solenoid?
14. Consider a circular loop of wire lying in the plane of the table. let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of magnetic field inside and outside the loop?
15. What is the orientation of a current caring conductor relative to the direction of magnetic field for
(a) Maximum magnetic force.              (b) Minimum magnetic force
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NCERT Solutions for class 9 Maths

21/7/2012

7 Comments

 
Chapter 1 - Number Systems
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Chapter 2 – Polynomials
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Chapter 3 - Coordinate Geometry
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Chapter 4– Linear Equations in Two Variables
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Chapter 5 – Introduction to Euclid's Geometry
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Chapter 6 – Lines and Angles
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Chapter 7 – Triangles
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Chapter 8 – Quadrilaterals
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Chapter 9 – Areas of Parallelograms and Triangles
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Chapter 10 –Circles
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Chapter 11 – Constructions
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Chapter 12 – Heron's Formula
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Chapter 13 – Surface Areas and Volumes
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Chapter 14 – Statistics
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Chapter 15 – Probability
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MCQ: Fill in the blanks:  Acid base and salt d salt

18/7/2012

2 Comments

 
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 MCQ 
Fill in the blanks:  Acid base and salt d salt       
1.       
The substances whose aqueous solution change the blue litmus to red ------------------Acids
2.       
The substances having a tendency to lose one or more protons are called: ------------   Acids
3.       
The substances which donate the pair of electrons for bond formation, are known as:-------     Base
4.       
When equivalent quantities of acid and base are mixed, salt and water are formed, the reaction is termed as:----------- Neutralization
5.       
The acids which contain one acidic hydrogen are called:-------- Mono-protic
6.       
The number of acidic hydrogen atoms present in a molecule of an acid is called: ----  Basicity
7.       
The number of replaceable [OH] ions present in a molecule of base, is called: ---    Acidity
8.       
An acid that produces large number of (H) ions in aqueous solution is called: ---------Strong acid
9.       
An ionic compound, that is formed when an acid neutralizes a base, is called:------ Salt
10.   
SaIts that formed by the reaction of strong acid with weak base are:----Acidic
11.   
Alums are example of  ---------salt:               Double salts
12.   
The formula of Washing Soda is                                                  Naâ‚‚CO₃ 6Hâ‚‚O
13.  
Acids are the substances which give H+ ions aqueous solution, is the concept of:   Arrhenius
14.   
Arrehenius theory of acid-base is not applicable in:     non — aqueous solution
15.   
According to the Arrhenius concept, the strength of acid or base is based on their:   --------
a. rates of ionization          b. rates of dissociation
     16
According to Bronsted — Lowry concept, a base is a substance which acts as:      a proton acceptor(NH₃)
2 Comments

CBSE MCQ’s :CLASS - X Science: Magnetic Effects of Currents

9/7/2012

3 Comments

 
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                                           CBSE MCQ’s TEST PAPER -1 
                   CLASS - X Science: Magnetic Effects of Currents

1. When a bar magnet is broken into two pieces:

(A) we will have a single pole on each piece        (B) each piece will have two unlike poles

(C) each piece will have two like poles                (D) None of these

2. The magnetic field intensity produced due to a current carrying coil is maximum at :

(A) any point                                              (B) the centre of the coil

(C) any point lying on the axis of the coil       (D) points lying between centre of the coil and its circumference

3. The direction of magnetic lines of force produced by passing a direct current in a conductor is :

(A) Perpendicular to the conductor & coming outwards      

(B) parallel to conductor

(C) Surrounding the conductor and of circular nature        

 (D) perpendicular to the conductor & coming inwards

4. Which of the following statement is not correct about two parallel conductors carrying equal currents in the same direction ?

(A) Each of the conductors will experience a force.                

(B) The two conductors will repel each other.

(C) There are concentric lines of force around each conductor.

(D) Each of the conductors will move if not prevented from doing so.

5. Which of the following determine the direction of magnetic field due to a current carrying conductor ?

(A) Faraday’s laws of electromagnetic induction. (B) Fleming’s left-hand rule.

(C) Lenz’s law.                                                (D) Maxwell’s cork screw rule.

6. A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then :

(A) a current will be induced in the coil (B) no current will be induced in the coil.

(C) only emf will be induced in the coil (D) am emf and current both will be induced in the coil 


X Magnetic Effects of Currents  MCQ'S - I (10Q)
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X Magnetic Effects of Currents CBSE Test Paper - 1
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Enrich your study: IX:Force and laws of motion solved Problems

7/7/2012

3 Comments

 
Picture
1. An athlete runs a certain rest before taking a long jump. Why?

An athlete runs a certain distance to accelerate himself and gain enough momentum so that he can jump through the maximum possible length.

2. Springs are provided in car seats. Why?


The springs in the car seats absorb shock (sudden jumps) due to the roughness of the road. Thus, making the ride more comfortable.

3. A gun of mass 1500 kg fires a shell of mass 15kg with velocity 150 m/s. calculate velocity of recoil of the gun.

Before firing, total momentum of the gun and shell is = 0 (they were all at rest)

After firing, the momentum of the shell = 15 X 150 = 2250 Ns

The momentum of the gun is = 1500v Ns

By conservation of momentum,

Total momentum before firing = Total momentum after firing

=> 0 = 2250 + 1500v

=> v = -2250/1500 = -1.5 m/s

The negative sign implies the recoil velocity of the gun is opposite to the velocity of the shell.

4. Why cricketer pulls his hands backwards while catching the ball

Ans: cricketer pulls his hands backwards while catching the ball. When he does so, momentum of the ball reduces slowly, and time t required for this increases. As per F =DP/t , as t increase, magnitude of F decreases. As a result  cricketer can catch the ball, easily, without any injury.

5. Why A karate player in order to break a brick, hits it quickly.

Ans: A karate player in order to break a brick, hitsit quickly, so in a short time there is a large change

in momentum and as per F =change in p/t  as large force acts on the brick and it breaks.

6. What is impulse of Force?

Ans: Product of force and the time period for which force is acting is called impulse of force. If, on an object, Force F acts for time t. Then  Impulse of force = force x time

I = F x t= 
change in  p

Like force, impulse of force is also a vector quantity. Direction of impulse of force is same as the direction of force. Unit of impulse of force is kg m/s or Ns.


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HOTS QUESTIONS : X Acid base and salt

6/7/2012

5 Comments

 
Picture
HOTS QUESTIONS

1. In one of the industrial process used for manufacture of sodium hydroxide, a gas ‘X’ is formed as by – product. The gas ‘X’ reacts with lime water to give a compound ‘Y’ which is used as a bleaching agent in chemical industry. Identify ‘X’ and ‘Y’ giving the chemical equation of the reaction.

Ans: In the manufacture of sodium hydroxide, hydrogen gas and chlorine gas (X) are formed as by products. When chlorine gas (X) reacts with lime water, it forms calcium oxy chloride (bleaching powder) Y.

2NaCl (aq) + 2 H2O (L)
----> 2NaOH (Aq) + Cl2 (G) + H2 (G)

‘X’ Þ Cl2 gas

Ca(OH)2 + Cl2
----> CaOCl2 + H2O

Q. Dry hydrogen chloride gas does not turn blue litmus, whereas hydrochloric acid does. Why?

Ans: In the dry state, hydrogen chloride (HCl) does not release H+ ions. Therefore, it cannot behave as an acid. When dissolved in water, it forms hydrochloric acid. It dissociates to give H+ ions in solution and behaves as an acid.

Acid when react with metals release hydrogen gas but there is one acid which when reacts with metals does not release hydrogen except for two metals. Prove this statement.

Acid + Metal 
----> Salt + Hydrogen

e.g. 2HCl + 2Na 
---->2NaCl + H2

       H2SO4 + 2Na 
----> Na2SO4 + H2

       HNO3 + Na 
---->No hydrogen gas.

Because nitric acid is strong oxidising agent. Nitric acid reacts only with Mg and Mn to give hydrogen gas.

                Mg + 2HNO3 ---->   Mg(NO3)2 + H2

                Mn + 2HNO3
---->Mn(NO3)2 + H2

Self Practice

Q.  4      Name the properties responsible for the following uses of baling powder. (i) Baking industry (ii) As an antacid  (ii) As soda-acid fire extinguisher.
             

Q.  5    What is meant by water of crystallisation of a substance? What is its importance?

Q.  6    What effect does an increase in concentration of ‘H’ ions in a solution have on the pH of a solution

Q.  7  Fresh milk has a pH Of 6.  When it changes to curd, will its pH value increase or decrease? Why?

Q. 8   How does the flow of acid rain water into a river make the survival of aquatic life in a river difficult?

Q. 9    Arrange in the increasing order of their pH values:  NaOH solution, Blood, Lemon juice,

Q. 10 Two solutions A and B have pH values of 5 and 8 respectively.  Which solution will be basic in nature?


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class 9 Force and laws of motion Exam questions solved

5/7/2012

0 Comments

 
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1. An object of mass 2 kg is sliding with a constant velocity of 4 m/ s on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 32 N                                    (b) 0 N                          (c) 2 N                          (d) 8 N                         
(b]       
 2. Rocket works on the principle of conservation of
(a) mass                                   (b) energy                     (c) momentum               (d) velocity                     [c]

3. A car is moving at 45 km/hr.A constant force acts on the car for 10 sc .So that it's velocity becomes 63 km/hr .The distance travelled by car during this interval of 10 sec is :
a) 100 m                                   b) 150 m                       c) 200 m                       d) 50 m
                        [b]
    
What is the definition of balanced and unbalanced force?
When two equal forces acting on an object in opposite directions called balanced force. When something does not move the forces are balanced, e.g. Gravity pulls a table down but that table is pushed up by the floor or the ground it stands on so doesn’t’ move.
An Unbalanced force is needed for something to change movement or change direction, e.g. aseesaw moving up and down because the forces are not equal.
Net force: - The sum of all the forces acting on a body is known as net force.

Difference between Balanced force and unbalanced force.
 Balanced force:- If net force on a body is zero it is called balanced force. Balanced forces do not cause a change in motion. They are equal in magnitude and opposite in direction. Therefore, the resultant of these forces will be zero.
Example: Two persons pushing a box with the same force in opposite directions.
Unbalanced forces:- If net force on a body is non-zero it is called unbalanced force.
Forces whose resultant is not equal to zero are called unbalanced forces. For example: An arm wrestling competition among a strong person and a weak one. The resultant force will be in the direction of the force applied by the strong person.
What Is Inertia
By Newton's law we know that ,a body at rest will remain at rest and a body in motion will continue in a straight line unless it is compelled by an external force.This tendency of a body is called inertia.So we can say that 'Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.'
When the brakes are applied to the bike the back seater  moves forward why?
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IX Force and laws of motion solved questions: NCERT / CBSE Textbook Exercise Questions Solved 

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