CLASS 10
SUBJECT : SCIENCE 
DATE OF SUBMISSION: 31.05.2019
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_____________________________________________________________________________DATE OF SUBMISSION: 17.06.2018
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DATE OF SUBMISSION: 11.06.2018

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DATE OF SUBMISSION: 31.05.2018

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DATE OF SUBMISSION: 03.01.2018

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DATE OF SUBMISSION: 07.12.2017

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DATE OF SUBMISSION: 15.11.2017

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DATE OF SUBMISSION: 05.11.2017

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DATE OF SUBMISSION: 20.08.2017

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Date of  Submission-3-7-17

1. The decomposition of vegetable matter in to compost is an example of what type of reaction? (1)

2. Which term is used to indicate the development of unpleasant smell and taste in butter and oil containing food? (1)

3. What color difference would you observe on burning a candle and a magnesium ribbon? (1)

4. Ashok wanted his house to white washed. He bought 10kg quick lime from market and dissolved it in 30 liters of water. On adding lime to water he noticed that bubbles were produced and the solution becomes hot. Give reason and name the product formed. (2)

5. Arun took a pale green substance X in a test tube, and heated it over a flame. He observed a color change along with evolution of two gases with the smell of burning sulphur (a) Identify X. (b) Identify the product formed.      (c) Write the equation.  (d) Identify the type of chemical reaction. (3)

6. Grey colored metal ‘X’ is used in making dry cell. It is  also used for coating iron metal to prevent it from rusting .When granules of ‘X’ are added to blue solution of compound of a reddish brown metal ‘Y’, the color of the solution gets discharged and metal ‘Y’ is formed. Identify ’X’ and ‘Y’. Write the chemical reaction and identify the type of reaction. (3)

7. A compound ‘X’ is used for drinking has pH=7.Its acidified solution in presence of electricity undergoes decomposition to produce   gases ‘Y’ and’Z’. The volume of ‘Y’ is double than ‘Z’.’Y’is highly combustible whereas ‘Z’ is a supporter of combustion. Identify ‘X,’Y’’Z’and write the chemical reactions involved. (3)

8. A metal nitrate solution ‘A’ is added to reddish brown metal ‘B’. The metal present in ‘A’ is used for making jewellery and turns black in air, very thin foils of metal are used to decorate sweets. The compound ‘C’ formed on chemical reaction is blue in color and metal present in ‘A’ is formed. Identify A’ ‘B’ and ‘C’   and write chemical reactions involved. (3)

9. Silver articles develop black coating and copper articles develop green coating. Which chemical phenomenon is responsible for this coating?

Date of  Submission-5-6-17

1.Balance the following equations

a) HNO₃   + Ca(OH)₂ à Ca(NO₃)₂ + H₂O

b) NaOH + H₂SO₄    à Na₂SO₄ + H₂O

c) BaCl₂   +   H₂ SO₄à BaSO₄   + HCl

d) H₂ SO₄ + KOH à K₂ SO₄ 

e) H₃ (PO₄ )  +  Ca (OH)₂ à Ca₃(PO₄ )₂ + H₂O

2. Differentiate between the following

   a)Combination and decomposition

    b) Displacement and double displacement

    c) Endothermic and exothermic reaction

Date of submission-5 June2017                                  
 To be done in HW notebook

Chemistry

Write the formulas of the following compounds

Hydrochloric acid

Sulphuric acid

Nitric acid

Sodium hydroxide

Magnesium oxide

Aluminium sulphate

Calcium chloride

Common salt

Quick lime

Slaked lime

Biology

Draw the digestive system and label the parts

Draw the different stages in the nutrition of amoeba

Draw the structure of human heart and label the parts

Differentiate between different types of nutrition

Draw stomata and label

Physics

Draw the conventional symbols used commonly for the different components of an electric circuit

Differentiate between conductors and insulators

DATE OF SUBMISSION-27-2-17

1. Define centre of curvature, radius of curvature, pole and principal axis of a spherical mirror.

2. Define real image and virtual image.

3. When an object is kept beyond the centre of curvature of a concave mirror, what is the nature of image formed?

4. An object is placed at a distance of 10cm from a convex lens of focal length 15 cm. Find the position size and nature of image formed

5. What is the relation between the radius of curvature and focal length of a spherical mirror?

6. Write any 3 uses of a concave mirror.

7. With the help of ray diagram explain the uses of convex mirror.

8. Write mirror formula and explain the terms involved.

9. Define magnification of a mirror.

10. A rear view mirror used in a bus has a radius of curvature 3.5 m. If the driver of the bus locates a car at 10.0m behind the bus, find the position, nature and size of the image of the car.

11. What is the focal length of a plane mirror?

12. Why is the conversion of ethanol to ethanoic acid an oxidation reaction?*. 13. A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

 14.How would you distinguish experimentally between an alcohol and a carboxylic acid

15. Would you be able to check if water is hard by using a detergent?

16. While cooking, if the bottom of the vessel is getting blackened on the outside, it means that (a) the food is not cooked completely. (b) the fuel is not burning completely. (c) the fuel is wet. (d) the fuel is burning completely. (b) 17.Draw the electron dot structures for* (a) ethanoic acid. (b) H2S. (c) propanone. (d) F2. (a) Ethanoic acid (b) H2S (c) Propanone (d) F2

18.What is a homologous series? Explain with an example

19.How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?