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Old June 4th, 2014, 11:39 AM
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Default Central Board of Secondary Education question papers of 10th standard for the Physics

Will you please give me the Central Board of Secondary Education question papers of 10th standard for the Physics, Chemistry and Biology as it is very urgent for me?
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Old June 5th, 2014, 12:47 PM
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Default Re: Central Board of Secondary Education question papers of 10th standard for the Phy

As you want to get the Central Board of Secondary Education question papers of 10th standard for the Physics, Chemistry and Biology so here is the information of the same for you:

Some content of the file has been given here:

1. The pH of three acids A, B and C having equimolar concentrations are 40, 50 and 3.5
respectively, at 298 K. Arrange these acids in order of their increasing acidity. 1

2. What chemical process is used to obtain a metal from its oxide ore ? 1

3. For a plane mirror, magnification is m = +1. What does the positive sign of m signify ?

4. Why does the pole star appear fixed in the sky ? 1

5. What is gypsum ? Name the main product formed when gypsum is heated to 373 K.
Write two uses of the product. 2

6. Differentiate between roasting and calcination. Give one example of each. 2

7. Two thin lenses of power + 4.5 D and — 2.5 D are placed in contact. Find the power and
focal length of the lens combination. 2

8. Distinguish between polar and equatorial orbits for artificial satellites. Illustrate the two
orbits through a diagram. 2

9. (a) Define the term, ‘rate of a reaction’.
(b) Name any two factors which affect the rate of a reaction.
(c) What will be the effect of increase in temperature on the concentration of product(s)
of an exothermic reversible reaction carried out in a closed container ? 3

10. Explain giving reasons : 3
(i) The surface of some metals acquires a dull appearance when exposed to air for a
long time.
(ii) Non-metals do not replace hydrogen from dilute acids.
(iii) Sulphuric acid is known as the ‘king of chemicals’.

11. What is formalin ? What is it used for in the school laboratory ? Name the main product
formed when formalin is treated with Fehling’s reagent. 3

12. What is meant by ‘refractive index of a transparent medium’ ? Trace the path of a ray of
light to show that the emergent ray is laterally displaced when it passes through a
rectangular slab. 3

13. In the circuit shown in the figure below, calculate (i) the current flowing through
the arms AB, CDE and BH, (ii) the potential difference across AB, CD and DE. 3

15. (a) Name the ore from which iron is extracted. Write its chemical formula.
(b) Name the raw materials required for extracting iron.
(c) Which reducing agent reduces the iron ore in the blast furnace ?
(d) Write the chemical reactions that take place in the blast furnace for the extraction
of iron from its ore. 5
OR
(a) What does ‘Fountain Experiment’ demonstrate about ammonia ? Describe with a labelled
diagram, the Fountain Experiment.
(b) Describe the changes you would observe when
(i) NH4OH is gradually added to CuSO4 solution till it is in excess.
(ii) SO2 gas is passed through acidified potassium dichromate solution. 5

16. What is Myopia ? Write two causes for this defect to occur. With the help of ray
diagrams illustrate how this defect can be corrected. A person with a myopic eye cannot
see objects beyond 1.5 m distinctly. What should be the power of the corrective lens used
to restore proper vision ? 5
OR
(a) (i) Why are fossil fuels classified as non-renewable sources of energy ?
(ii) Mention any two differences between the two common designs of solar cookers.
(iii) Why is tidal energy not likely to be a potential source of energy ?
(b) (i) State the roles of moderator and coolant fluid in a nuclear reactor.
(ii) Name one moderator and one coolant employed widely. 5

17. Define ‘eutrophication’ 1

18. What is a neuron ? 1

19. How is respiration different from breathing ? Distinguish between aerobic and anaerobic
respiration. 2
OR
Describe an activity to show that carbon dioxide is necessary for photosynthesis.

20. Suggest any four practices which may help in protecting our environment. 2

21. Define ‘evolution’. Describe Darwin’s theory of evolution. 3
OR
What is a gene ? Where are the genes located ? What is the nature of gene ?

22. (a) Define the terms unisexual and bisexual, giving one example of each.
(b) List the reproductive parts of a flower. 3

23. “Nervous and hormonal system together perform the function of control and coordination
in human beings.” Justify the statement. 3

24. (a) Draw a diagram of the human heart. Label Aorta, Pulmonary trunk, Right atrium
and Left ventricle on it.
(b) What is the meaning of the term, ‘double circulation’ ?
(c) List the components of blood. 5

For more detailed information I am uploading PDF files which are free to download:

Contact Details:
Central Board of Secondary Education
Community Centre,
Preet Vihar Metro Railway Station,
Shiksha Kendra,Building No.2,
Acharya Nag Raj Marg, Block D,
Preet Vihar,
New Delhi,
Delhi 110092 ‎
011 2202 3737
India

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