1. Use Euclid’s algorithm to find the HCF of the following:
(A) 4052 and 12576.
(B) 135 and 225
(C) 196 and 38220
(D) 867 and 225

2. Find the LCM and HCF using prime factorization method:
(A) 6 and 20
(B) 6,72 and 120
(C) 12, 15 and 21
(D) 17, 23 and 29

3. Find the LCM and HCF of the following pairs of integers and verify that LCM X HCF= product of the two numbers.
(A) 26 and 91
(B) 510 and 92
(C) 336 and 54

4. Find the largest number which divides 615 and 963 leaving remainder 6 in each case.

5. The length, breadth and height of a room are 8m 25cm, 6m75cm and 4m50cm, respectively. Determine the longest rod which can measure the three dimensions of the room exactly.

1. If the perimeter of a circle is equal to that of a square , then the ratio of their areas is
(a) 22:7
(b) 7:22
(c) 14:11
(d) 11:14

2. A solid sphere of the radius 6cm is melted and recast into spherical balls of 2cm radius. Find the number of the balls made.
(a) 3
(b) 108
(c) 216
(d) 27

3. The slant height of the frustum of cone is 5cm .If the difference between the radii of its circular ends is 4cm , then height of the frustum is :
(a) 3.5cm
(b) 1cm
(c) 3 cm
(d) 2cm

4. One card is drawn from a well shuffled deck of 52 playing cards. Find the probability of getting
(i) a non face card
(ii) a black king or a red queen

5. Find the area of the quadrilateral formed by the points
A (1,2),
B (4,0) ,
C (5,2)
D (3,5)

1. If a pair of linear equations is consistent, then the lines will be :
(A) parallal
(B) always coincident
(C) intersecting or coincident
(D) always intersecting.

2. The following pairs of linear equations 2x+5y=3 and 6x+5y=12 represents:
(a) Intersecting lines
(b) Parallel lines
(c) Coincident lines
(d) None from a, b, c

3. The number of solutions of the pair of linear equations x+2y-8=0 and 2x+4y=16  have :
(a) 0
(b) 1
(c) Infinitely many
(d) None

4. The value of k, if line represented by the equation 2x – ky = 9 passes through the point (-1,-1).
(a) 12
(b)11
(c) 10
(d) None of these

5. Solve for x and y : 7( y + 3 ) – 2 (x + 2 ) = 14 ; 4 ( y -2 ) +3 (x -3 ) = 2

The CBSE will introduce the online All India Entrance Examination for Engineering (AIEEE) in 22 cities from next year. No pen/paper exercise will be allowed in these 22 Centres. Successful pilot tests, which was conducted last year, has led to this initiative. Also, candidates are being offered a flexible schedule of examination.

1. What are the covalent bonds?
2. Like carbon, silicon also shows the property of catenation, then why does silicon not forms large number of compounds?
3. Name an isomer of n–butane.
4. In which allotrope of carbon, the carbon atoms are bonded to other carbon atoms via single bond?
5. Draw the structure of complete molecule of cyclohexane.
6. Give the IUPAC name for the following. CH3 –C2H5-CH3
7. What is the chief constituent of beer, wine, whisky and other liquors?
8. Write the esterification reaction.

1 Marks Questions

Q.1 Why do we hear sound of approaching aero plane before it reaches us? (1x3)

Q.2If an electric bulb of 60w lighted for 10 hrs. How much is the electric energy consumed in joules?

Q.3 How many electrons are present in P3-?

Q.4 The speed of an arrow shooted from the bow is square root of its Kinetic Energy. What is the mass of an arrow? (2x7)

Q.5 A girl vibrates her scale 20 cycles per minute. What is the time period of wave?

Q.6 What should be angle between force and displacement to get (a) Maximum Work (b) Minimum Work

1 Marks Questions

Q1. What is the work done when a body is moved horizontally along a frictionless surface?
Q2. Define 1 Joule.
Q3. What is the work done on a body moving in a circular path?
Q4. When is work said to be done against the force of gravity?
Q5. Define 1 watt.
Q6. What is kinetic energy?
Q7. What will happen to the Kinetic Energy of a body if its velocity is doubled?
Q8. Name four units of energy.
Q9. In a tug of war, one team gives way to other. What work is being done and by whom?

2 Marks Questions.

Q10. Name the transformation of energy involved in these casesa.Electric Heater
b. Dynamo
c. Microphone
d. Electric Cell
e. Headphone
f. Photoelectric Cell
g. When Coal burns

National Science Talent Search Exam

Cash Awards, Study Scholarships for graduate studies in India / USA / Europe : in diverse fields of Engineering, Sciences & Technology for deserving students irrespective of joining a FIITJEE Program (AY 2012-13)

Eligibility: Students Presently in Class VIII, IX, X & XI

Exam Fees: Rs.50/-

CBSE NATIONAL SCIENCE EXHIBITION 2011

The CBSE National Science Exhibition will be held on 21.10.11 and 22.10.11 at

AIEEE Online Examination 2012

For 11th AIEEE to be held in 2012 , the CBSE has made several changes in the examination system for benefit of students community at large. The changes are as follows. The 11th AIEEE (Offline Examination i.e. Paper/Pen Test) will be held on 29th April, 2012 in the following cities:

Aptitude and  Interest  Assessment  with  the  CBSE  Students  Global Aptitude Index: Enrolment for the 2012 Programme

ABOUT CBSE SGAI

• CBSE SGAI is a collection of aptitude indices designed for students of class X in

• CBSE affiliated schools to broadly assess: -

• Scientific Aptitude

• Numerical Aptitude

• Social Aptitude

• Behavioural Science Aptitude

• Art Aptitude

• Interest Profile

A student appears for a simple paper and pencil indicator having multiple choice items. The total duration of the CBSE SGAI is about 2-2.5 hours. Efforts are on to make the assessment ‘On-line’ very soon.

IMPORTANT INFORMATION ABOUT CBSE SGAI IInd EDITION

1. Date of CBSE SGAI: - 22nd January 2012.
2. Last date for on-line registration - 25 September 2011
3. Last date for submission of fee via DD – 10th October 2011

PURPOSE OF CBSE STUDENTS GLOBAL APTITUDE INDEX (SGAI)

The CBSE SGAI is meant for students of secondary classes. This coincides with the span of adolescence and beginning of career concepts and planning (although not in the concrete form).

SALIENT FEATURES OF CBSE SGAI

Although a variety of aptitude screening tests are already in vogue to help the student identify personal interests and vocations

Private forms for 2012 Exam

Download forms :

• Panchkula Region : Class X

1. What are the characteristics of particles of matter?

2. A sponge can be pressed easily, still it is called a solid. Why?

3. Differentiate solids liquids and gases on the basis of (a) diffusion , (b) density.

4. Solids are denser as compared to liquids , still ice floats on water. Explain.

5. Define Latent heat of fusion.

6. Why does water vapour has more energy than water at same temperature?

7. How can gases be liquefied?

8. List four factors which affect the rate of evaporation.

9. Name and define the fourth and fifth state of matter.

10. Why does a desert cooler cool better on a hot, dry day?

1. Camphor is purified by the process of –
a. evaporation
b. distillation
c. sublimation
d. filtration

2. LPG is used in the kitchens in our homes in the-
a. Solid form
b. compressed form
c. gaseous form
d. none.

3. Which of the following is not fluid -
a. water,
b. air,
c. sand,
d. sharbat?

4. On Kelvin scale 0oC is equal to –
a. 273 K
b. -273 K
c. 0 K
d. 100 K

5. SI unit of temperature is -
a. Kelvin
b. Celsius
c. Fahrenheit
d. Pascal

6. Condensation is a process which involves conversion of –
a. solid into liquid
b. liquid into vapour
c. vapour into liquid
d. liquid into solid

7. During evaporation, the particles of liquid evaporate from –
a. The bulk of liquid
b. surface only
c. the surface and bulk of liquid
d. none of them.

8. Which of the following will not sublime –
a. Camphor
b. ammonium chloride
c. bromine
d. iodine?

9. A state of matter which has a definite shape and fixed volume –
a. Solid
b. liquid
c. gas
d. none of these

10. A state of matter which does not have a definite shape but has definite volume –
a. Solid
b. liquid
c. gas
d. none of these

Q1. According to Dalton’s atomic theory, what is the definition of atoms?

Q2. Calculate the molar mass of Nitric Acid HNO3 (atomic mass of H=1, N=14, 0=16)

Q3. Calculate the no of moles for 53g of He.

Q4. How many molecules are present in 34 g of ammonia?

Q5. Calculate the number of aluminum ions present in 0.051g of aluminum oxide.

Q6. State the law of conservation of mass? What mass of silver Nitrate will react with 5.85g of sodium chloride to produce 14.35 g of silver chloride and 8.5 g of sodium Nitrate if law of conservation of mass is true?

Q7. What is the work done when a body is moved horizontally along a frictionless surface?

Q8. Define 1 Joule.

Q9. What is the work done on a body moving in a circular path?

Q10. When is work said to be done against the force of gravity?