Saturday, November 26, 2011

CLASS- X Biology MCQ(Multiple choice questions) How do organisms reproduce? Practice Paper

Multiple choice questions: How do organisms reproduce?

1. Which of the following is a working copy

(a) RNA (b) Protein (c) Fats (d) DNA

2. Which of the following is the blue print of body design & body function

(a) RNA (b) Protein (c) DNA (d) Amino acid

3. Spore formation occurs in

(a) Yeast (b) Hydra (c) Amoeba (d) Rhizopus

4. Which of the following can undergo regeneration

(a) Flat worm (b) Round worm (c) Rhizopus (d) Amoeba

5. Rose is multiplied by

(a) tissue culture (b) cutting (c) Layering (d) seeds

6. Pollen grains are produced by

(a) ovary (b) anther (c) filament (d) stigma

7. The male sex organ of a flower is

(a) stamen (b) sepal (c) petal (d) carpel

8. Which one of the following is a unisexual flower

(a) china rose (b) cucumber (c) rose (d) jasmine

9. Male gametes are produced by

(a)pollen grains (b) embryo sac (c) sigma (d) ovary

10. Receptive part of carpel is

(a) ovary (b) Stigma (c) placenta (d) style

11. On germination each pollen grain produces

(a)one male gamete (b) 3 male gametes (c) four male gametes (d)2 male gametes

12. Gonads form

(a) sex organs (b) sex hormones (c)gametes (d) both b & c

13. In man fertilization takes place in

(a)ovary (b) vagina (c) fallopian tube (d) uterus

14. Which of the following is a machanical barrier to conception

(a) condom (b) abortion (c) Cu T (d) oral pill

15. Development of an ovum from an unfertilized ovum is called

(a)vegetative propagation (b) Parthenogenesis (c) asexual reproduction (d) tissue culture

16. Fertilization in plants occurs in

(a) embryo sac (b) Pollen tube (c) stigma (d) style

17. Name the fusion product of male & female gametes

(a) ovum (b) zygote (c) PEN (d) sperm

18. Which part of the flower forms the fruit

(a) stamen (b) ovary (c) petals (d) ovule

19. The normal duration of menstrual cycle is

(a) one day (b) 14 days (c) 28 days (d) 7-8 days

20. Arrest of reproductive capacity in woman in the age of 45-55 years is known as

(a) menopause (b) Puberty (c) menarch (d) gestation

21. Vital connection between mother and foetus is called

(a)uterus (b) Placenta (c) vagina (d) embryo sac

22. The process of attachment of embryo in the uterus is called

(a) placentation (b)implantation (c) gestation (d) ovulation

23. Which of the following is not an STD

(a) AIDS (b) syphilis (c) typhoid (d) gonorrhoea

24. Which of the following is an IUCD

(a) Cu T (b) Diaphragm (c) tubectomy (d) oral pills

25. Which of the following is a sexually transmitted viral disease

(a)genital warts (b) syphilis (c) typhoid (d) gonorrhoea

Tuesday, November 22, 2011

CBSE I NCERT Class X Chapter: Light-Reflection and Refraction Quiz Questions

Question: 1.  Why do we prefer a convex mirror as a rear-view mirror in vehicles?

Question: 2.  Name the mirror that can give an erect and enlarged image of an object?

Question: 3.  What could be the position of the object if the image formed by a concave mirror is observed 
to be virtual, erect and larger than the object?

Question: 4.  Is the optical centre always at the centre of lens?

Question: 5.  When the image formed is virtual and erect, what is the magnification,  positive or negative?

Question: 6. When the image formed is real and inverted, what is the magnification,  positive or negative?

Question: 7.  Is mirror formula valid only for the plane mirror?

Question: 8.  Which light will refract more, a violet or red, if they pass through the same  glass slab with the 
same angle of incident?

Question: 9.  Does Snell’s law fail, if yes than when?

Question: 10.  What is a lens? 

Answers for above Questions 

Answer: 1.  Convex mirrors enable the driver to view much  larger area than would be  possible with a plane 

Answer : 2.  When an object is placed between the pole and  the principal focus of  a concave mirror, the 
image formed is virtual, erect, and enlarged

Answer:  3.  If the image formed by a concave mirror is virtual, erect and larger than the  object, the position 
of the object should be between the pole of the mirror  and its principal focus.

Answer:  4.  No, only if both the curved surfaces are symmetrical, optical centre will be at  the centre.

Answer:  5.  When the image formed is virtual and erect, magnification is positive.

Answer:  6.  When the image formed is real and inverted magnification is negative.

Answer:  7.  No, the mirror formula is valid for plane as well as for all spherical mirrors for  all positions of 
the object.

Answer:  8.  Violet light will refract more than the red light, because its wavelength is less  than that of red.

Answer:  9.  Snell’s law fails when the light rays incident normally on the surface of a  refracting medium. In 
this case light passes un deviated from the surface i.e. no refraction occurs.

Answer:  10.  A lens is a portion of a transparent refracting medium bounded by two  spherical surfaces, 
generally spherical or cylindrical or one curved and one  plane surface. It has a perfect or approximate axial 
symmetry which  transmits and refracts light.

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Saturday, November 19, 2011

IX Atoms and molecules Sample Test Paper 2012

Class – IX Subject -Science Atoms and molecules Sample Test Paper
Time 1 hr  M.M.35
(Section A) 10 x 1 = 10
1. The atomic radius of hydrogen atom is
a. 0.037 nm b. 0.037 x 10 -9 m c. both a &b d. none
2. Complete the following sentence : In water, the proportion of hydrogen and oxygen is ---------- by mass
a. 1:8 b. 3:4 c. 9:0 d. none
3. The actual mass of hydrogen atom
a. 1.673 x 10 -24 g b. 1.673 x 10 c.1u d. both a & b
4. The symbol of cobalt a.C.o. b. CO c. Co. d. none
5. Atomicity of noble gases is one
a. True b. false c. can’t say d none
6. The molecular mass of sulfuric acid
a. 28 u b. 108 u c. 98u d. none
7. What are the number of electron and proton in chlorine ion
a. 17p & 18 e b. 18 p & 17 e c. 17 e & 0 e d. none
8. The value of symbol ‘L’ a. 6.022 x 10 23 b. 6.022 x 10 -23 c. 0.622 x 10 23 d. none
9. What is the mass of of 0.2 moles of oxygen atoms?
a. 2.3 g b. 3.2 g c. .32 g d. none
10. Write the atomicity of CO2 gas a. 2 b. 3 c. 0 d. none
(Section B) 10 X 1 = 10
1.what is meant by saying “the atomic mass of oxygen is 16? 
2. What is the significance of formula H2O?
3. Calculate the formula mass of calcium chloride and sodium carbonate
4. An element Z forms an oxide ZO3. What is the valency of Z?
5. Write the Latin names of sodium, iron, mercury and tin.
6. Define 1 u.
7. Define electro negativity of any atom.
8. Name the element represent by the following symbols Hg, Pb, Au, Ag and Sn
9. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur.
10. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur.
(Section C) 5 x 2 = 10
1. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur.
2. Give major draw –backs of Dalton’s atomic theory of matter.
3. Work out the formula of magnesium chloride.
4. The mass of a single atom of an element X is 2.65 x 10 -23g. What is its atomic mass? What could this element.
5. Calculate the molar mass of the following Ethyne and nitric acid
(Section D) 2 x 2.5 = 5
6. State the law of conservation of mass. Give one example also.
7. In an experiment, 1.288 g of copper oxide was obtained from 1.03 g of copper. In another experiment 3.672 g of copper oxide obtain from the 2.938 g of copper. Show that these figures verify the law of constant proportion.       Other Educational Portals

Saturday, November 12, 2011

X CBSE | NCERT Carbon and Its Compounds - Test Paper

1. If the pH of water is two, out of soap and detergent which one will you usefor cleaning clothes? (1)

1. Name the compound CH3COOC2H5.Name the acid and alcohol from which it is made .write equation.

2. An organic compound X with a molecular formula C2H6O undergoes oxidation with in presence of Alkaline  KMnO4 to form a compound Y. X on heating in presence of conc. H2SO4 at 443k gives Z which on reaction with H2O in presence of H2SO4 gives back ‘X’ ‘Z’ reacts with Br2 (aq) and decolorizes it.
Identify X, Y &Z and write the reactions involved. (3)

3. An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H2O2 .This compound reacts with ethanol to form a sweet smelling compound B.
(i) Identify the compound A.
(ii) Write the chemical equation for its reaction with ethanol to formcompound ‘B’
(iii) How can we get compound ‘A’ back from B?
(iv)Name the process and write corresponding chemical equation (3)

4. Hydrocarbons X and Y have melting points-1900 C & -900 C respectively.Which one of these has minimum carbon in the molecule &why? (2)

5. Three bottles without labels contain alcohol, ethanoic acid and soap solution separately how will you test which bottle contains what. (3)

6. A compound X has molecular formula C4H10.It undergoes substitution reaction more readily than addition reaction. It burns with blue flame and is present in LPG. Identify ‘X’ and give the balanced equation for its combustion and substitution reaction with Cl2 in the presence of sunlight. (3)

7. A compound ‘A’ works well with hard water. It is used for making shampoos and products for cleaning clothes. A is not 100%biodegradable and causes water pollution. ‘B’ does not work well with hard water. It is 100%biodegradable and does not create water pollution. Identify A&B. (1)

8. Can we use sodium metal for drying alcohol, why? (2)

9. Complete and balance following equation:-
a) CH2=CH2 + H2  --Heat---------->
b) CH4+O2   --------------------à

10. Two alkanes A and B have 4 and 6 carbon atoms respectively in their molecule. In which physical state will they occur at room temp?
i) Give a test that can be used to differentiate chemically between butter and cooking oil.
ii) How will you distinguish between ethanol and ethanoic acid by a suitable chemical test? Write chemical reactions involved.
ii) Complete the following reactions :-
a) CH3COOH + NaHCO3 --coc. H2SO4-------->
b) HCOOH + CH3OH-------------->
c) CH3COOC2H5 + H2O----------->


Q1. Which of the following is not a saturated hydrocarbon?
i) cyclohexane.         

Q2.The bond between two identical non matalic atom has a pair of electron?
 i) un equally shared between two atoms.     
 ii) transferd completely from one atom to another. 
iii) with identical spins                     
iv) equally shared between them.

Q 3. Covalent compounds are genarily
i) solubal in water    
ii)insolubal in water      
 iii)ionize in water   
iv)hydrolyse in water

Q 4. Propane with the molecular formula C3H8 has
i)7covalent bonds               
ii)8 covalent bonds               
 iii)9 covalent bonds           

Q5. A hydrocarbon reacts with ammonical cuprons chloride Solution to form a red pricipate .The hydrocarbon is

Q6.Which of the following substance is added to denature Ethanol?
ii) pyricline      
iii)copper sulphate           
 iv)all of them

Q7. Which of the following is not an allotropic form of carbon

Q8.Detergents are sodium or potassium salts of long chain of ;-
 iii)carboxylic acid     
iv)sulphonic acid

Q9.Which of the following represents the correct increasing order Of unsaturated carbon ?
 i)alkanes , alkenes , alkynes                               
 ii)alkanes , alkaynes , alkenes
 iii)alkenes , alkynes , alkanes                        
 iv)alkynes , alkanes , alkenes
Q10. In double covalent bond there is sharing of
 i)2 electrons       
 ii)4 electrons                  
 iii) 6electrons                  
 iv)3 electrons

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Saturday, November 5, 2011

10th Science - Our Environment/Management of Natur...

CBSE PHYSICS: 10th Science - Our Environment/Management of Natur...:
Set-1Chapter - 15 Our Environment
1 mark questions :-
1. Write any one significance of biochemical cycles?
2. Define environment.
3. According to the sustenance from environment, organisms can be grouped into which three categories?
4. Name any two groups of producers.
5. Define consumers.
6. Write the two raw materials for making food, used by living organisms of first trophic
7. Explicate the principle of food web.
8. Which of the following are more numerous in a food chain :–(i) Secondary consumer (ii) Tertiary consumer
9. Define biological magnification.
10. Write the names of two decomposers.
11. Define global warming.
12. Write one ill effect of exposure to ultraviolet rays.
13. Which component of sunlight is vital for formation of ozone?
14. As a step to control pollution ‘Kulhads’ were used on a large scale. What was the ill
effect of this practice?
15. A food chain consists of grass, lion and rabbit. In this food chain, which organism will
transfer maximum energy?
16. Which of the following are Biodegradable; plastic toys, cow dung, aluminium foil and
17. Name the programme that froze CFC production in 1986.
18. Expand UNEP.
19. Which is greater – energy lost to the environment or energy transferred to next trophic
20. Write a common feature between a food chain and energy flow in nature.
21. How is packaging related to increase in non biodegradable waste?
22. Burning the coal yields energy, but if try to eat coal we will not get any energy. Why?
2 marks questions :-
23. Distinguish between biodegradable and non biodegradable wastes. Cite examples.
24. Why is a plastic bag is called non-biodegradable while a paper is not?
25. Choose a biotic components comprising physical factors from the following : Rose, Soil,
Leaf, Potato, Mountain, and Atmospheric pressure.
26. Name any four ecosystem.
27. Differentiate between natural and artificial ecosystem.
28. Why decomposers are necessary in environment?
29. Distinguish between food chain and food web.
30. Draw a pyramid showing four trophic levels.
31. Consider a food chain:-
Grass -------> Insect------->Frog ------->Snake ------->Hawk 900KJ
How much energy is available at the first trophic level and fifth trophic level respectively.
32. Enlist two uses of CFCS. Write their harmful effect.
33. What will happen if all the snakes are eliminated from the following
Grass ------->Insect -------> Frog ------->Snake ------->Hawk
34. Is the road near your school a part of ecosystem? Explain
35. A neem tree is a producer but not the bread mould found on bread we eat. Give reasons.
36. Describe the process of decomposition.
37. Pesticides are useful to farmers, yet considered as pollutants. Give reason.
38. Energy stored in the body of lion is the energy coming from sun. Justify.
41. Enlist various categories of consumers giving examples of each.
42. Describe the 10% law of flow of energy using example. What percentage of solar energy
is captured by plants in terrestrial ecosystem that falls on their leaves?
43. Write two informations obtained from the energy flow diagram.
44.H A farmer cultivates wheat crop in his agricultural field. Explain the interlinks of Biotic andabiotic factors in this case.45.H Explain how the pesticide used in the field reaches inside the body of a tertiary consumer?
46. Recently the honourable court of justice banned the use of polythene bags. Do you
support the step. Explicate with reasons.
47. Correlate the natural replinishment of soil and decomposers.
5 marks questions :-
48. Make two food chains and a food web from the following set of living organisms : Grass, Lion, Vulture, Deer, Insect, Snake. Identify the tertiary consumer in both of the food chains.
49.H Identify a deadly poisonous gas ‘X’ found at higher level of atmosphere which shields the surface of earth from harmful radiations from the sun. Write its chemical formula and equation of its formation. Why is damage to the ‘X’ layer a cause of concern? What steps are beings taken to limit this damage?
50.You are involved in a discussion on Interrelationship between environment and life styles.” with Nagendra and Paramjit. Nagendra is a village farmer and Paramjit is a
owner of a popular showroom. Give the details of issue discussed. Describe the illeffects of such lifestyles on the environment.
Solution and hint
1. Recycling of different materials.
3. Producers, consumers, decomposers
4. Green plants, certain blue green algae
6. CO2 and H2O
7. Each organism generally eaten by two or more organisms.
8. Secondary
9. Accumulation of materials
10. (i) Bacteria (ii) Fungi
12. Skin cancer
15. Grass to rabbit
17. UNEP
22. we lack enzymes to obtain coal’s energy
31. I = 9000 KJ, V = 0.9 KJ
32. Extinguisher or refregerant cause ozone layer depletion
35. Neem in autotroph, Bread mold parasite
39. Deer, grass hopper, scorpion40. owl, lion, vulture, fox
Set-2 10th Science - Our Environment/Management of Natural Resources

1. What is pollution?

Thursday, November 3, 2011

Online Application for CTET - JAN 2012 Examination

1. Application Procedure: 
The online submission of particulars may be made at website The candidates should supply all the required details while filling up the online form. On submission of details, a Confirmation page with Registration No. shall be generated. Candidates are required to take printout of Confirmation page and paste photograph, sign in the space earmarked for the purpose. The confirmation Page is to be sent by Registered/Speed Post to CBSE (NOT BY COURIER) to
" The Assistant Secretary (CTET Unit), Central Board of Secondary Education, 'Shiksha Sadan', 17, Rouse Avenue, New Delhi - 110002" along with original Demand Draft (if fee paid by Demand Draft) for further processing so as to reach latest by 30.11.2011 . Application received beyond this date will not be accepted. Payment can be made as follows by Credit/Debit Card or

Demand Draft in favour of the Secretary, Central Board of Secondary Education, Delhi drawn in any Nationalized Bank payable at Delhi. Write your Name, Address, Mobile No. and Registration No. on the back of the demand draft.
2. Examination Fees
CategoryFee Amount in Rs.
General / OBC Category Rs. 500 /- (Five hundered)
SC / ST / Differently Abled Category Rs. 250 /- (Two hundered Fifty)
3. Application can be submitted Online during 01.11.2011 to 25.11 .2011.
5. Payment of Fee could be made by Demand Draft or Credit/Debit Card.
Steps to be followed if fee paid through Demand Draft
If you want to remit the fee by Demand Draft, get ready before filling application form.
Demand Draft in favour of the Secretary, Central Board of Secondary Education, Delhi drawn in any Nationalized Bank payable at Delhi. Write your Name, Address, Mobile No. and Registration No. on the back of the demand draft.
Logon to the CTET website, fill the application form, note down the registration number which would be generated by system that is required for making the payment of fee.
Fill the details of Demand Draft.
Take a printout of Confirmation Page and complete as per the instruction given above.
Steps to be followed if fee paid through Credit/Debit Card
Keep the details of Credit/Debit Card (VISA/MasterCard) ready.
Logon to the CTET website, fill the application form, note down the registration number which would be generated by system that is required for making the payment of fee.
Make the payment through Credit Card and note down the payment receipt number, after successful payment of fee.
Take a printout of Confirmation Page and complete as per the instruction given above.
Note : Bank will charge 2% service/processing charges and service tax as applicable on transaction
ade by Credit card.
3 Simple Steps to Apply Online
 1. Fill the Online Application Form and note down the registration number
 2. Make payment of Fee by Demand Draft, Credit Card or Debit Card
 3. Take a printout of Confirmation Page and send to CBSE along with Original Demand Draft (if fee paid by Demand Draft)

Wednesday, November 2, 2011

CBSE | NCERT Ch - Carbon and its compounds F.A. - III Class 10

CARBON AND ITS COMPOUNDS F.A. - III-2011-12 TIME: 40 min.  Max. Marks. -40.

1. Name the compound formed on heating ethanol at 443 K with excess of conc. H2SO4.1

2. What happens when a small piece of sodium is dropped into ethanol?1

3. Write the chemical equation for the decarboxylation reaction of ethanoic acid.1
4. Give an example of esterification reaction.1

5. Name the product obtained when ethanol is oxidized by either chromic anhydride oralkaline Potassium per manganate. 1

6. Write the chemical equation representing the preparation reaction of ethanol from ethene.1

7. Name the two elements which are present both in CNG and petroleum.                     2

8. Draw the electronic dot structure of ethane molecule (C2H6).                                    2

9. Write the IUPAC name of the next homologue of CH3OHCH 2 CH3                         2

10. Define homologous series of organic compounds. Mention any two characteristics of homologous series.              2

11. Describe a chemical test to distinguish between ethanol and ethanoic acid.               2

12. Give the name of functional groups. (i) –CHO (ii) –C = 0                                          2

13. Why does carbon form compounds mainly by covalent bonding?                               2

14. Give a chemical test to distinguish ethanol from ethanoic acid.                                  2

15. Allotropy is a property shown by which class: Substances, elements, compounds or Mixtures? Give one 
example of allotropy.                        2

16. How may be the following be obtained from ethanol? Express giving chemical equations.

(i) Ethyl ethanoate (ii) Sodium ethoxide.                                                                          2

17. Describe with chemical equation how ethanoic acid may be obtained from:

(i) Ethanol (ii) methanol                                                                                                     2

18. Explain the cleansing action of soap.                                                                            3

19. Distinguish between esterification and saponification reactions of organic compounds. 3

20. Explain the structure of graphite in terms of bonding and give one property based on this Structure.3

21. Name the organic acid present in vinegar. Write a chemical equation which represents the Commercial method for the preparation of this acid from methanol.      3

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