Chemical reaction and equation

Class 10th Science
Chemical Reaction and Equations Test

Maximum marks- 30

Maximum time- 45 minutes

1.  Explain the process of corrosion and rusting. (2 marks)

2.  How is exothermic reaction different from an endothermic reaction? (3 marks)

3.  Explain four different types of chemical reaction with suitable examples. (8 marks)

4.  How do we balance a chemical equation? (4 marks)

5.  Why are oil and fat containing food items flushed with nitrogen? (3 marks)

6.  What is the difference between displacement and double displacement reaction? Give suitable chemical equations for the same. (3 marks)

7.  Give two uses of quick lime. (2 marks)

8.  What is electrolytic decomposition? (2 marks)

9.  Identify the following type of reactions:-

               ▪  Na2SO4 + BaCL2 = BaSO4 + 2NaCL

               ▪  CaCO3 = CaO + CO2

               ▪  Fe + CuSO4 = FeSO4 + Cu (3 marks)

Carbon and it's compound

Class X Science
Test for Carbon and its Compounds

Total Time: 25 mins

Total Mark: 15

1.   Give the electron dot structure of CO2.

(2 Marks)

2.   What is hydrogenation? What is its industrial application?

(2 Marks)

3.   What is funcational group? Identify the functional group present in CH3COOH and C2H5OH.

(3 Marks)

4.   Explain the mechanism of cleaning action of soaps.

(3 Marks)

5.   (a) What are hydrocarbons?

       (b) Give difference between saturated and unsaturated hydrocarbons.

       (c) Why does carbon form large number of compounds?

(5 Marks

Acids Bases and salt

ACIDS, BASES AND SALTS TEST

MM: 20

Time: 25 mins

1.  Name two constituents of baking power.      (1 mark)

2.  What is universal indicator?      (1 mark)

3.  Name the chemicals that can be made of common salt      (1 mark)

4.  Why does cake become fluffy after adding baking soda?      (1 mark)

5.  Write the pH value, after which teeth start decaying?      (1 mark)

6.  State some uses of baking soda?      (2 marks)

7.  How is the concentration of hydroxide ions      (OH-) affected when excess base is dissolved in a solution of sodium hydroxide?      (2 mark)

8.  Name the gas evolved when dilute sulphuric acid acts on sodium carbonate.Write the chemical equation for the reaction involved.      (2 mark)

9.  What are the properties and uses of bleaching powder?(3 marks)

10.  Write a chemical formula to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open.      (2 marks)

11.  What happens when quick lime is added to water?      (2 marks)

12.  Write any two properties of acids.      (2 marks)

Life Processes

MAX MARKS: 30

MAX TIME:60 mins

1.  List down the raw materials for photosynthesis? (1 Mark)

2.  Specify what is the role of bile juice in the process of digestion? (1 Mark)

3.  Name the respiratory organ in fish and earthworm. (1 Mark)

4.  Name the types of blood vessels used for the transportation of blood. (1 Mark)

5.  What is dialysis? (1 Mark)

6.  How is respiration in plants and respiration in animals different? (2 Marks)

7.  Draw the labeled diagram of the human digestive system. (2 Marks)

8.  How are alveoli designed and why? (2 Marks)

9.  Define excretion. What are the two organs in human beings that act as accessory excretory organs? (2 Marks)

10.  State the role of the following (i) Chloroplasts (ii) Diaphragm (iii) Larynx (3 Marks)

11.  Give reasons for the following:

(i) The glottis is guarded by epiglottis.

(ii) It is said to not speak while eating.

(iii) Walls of trachea are supported by cartilage rings. (3 Marks)

12.  Leaves of a potted plant were coated with wax to block the stomata.

Will this plant remain alive and healthy for long? State three reasons for your answer. (3 Marks)

13.  Describe the process and importance of double circulation in humans. (3 Marks)

14.  (i) Name the blood vessel that brings oxygenated blood to the human heart. (5 Marks)

(ii) Which chamber of human heart receives oxygenated blood?

(iii) Explain how oxygenated blood from this chamber is sent to all parts of the body.

Our environment

Maximum time- 30 minutes

Maximum marks-25

1.  What are decomposers? Write their importance with respect to our environment.     (2)

2.  Write the causes of depletion of ozone layer. How can we prevent it?     (3)

3.  Explain the formation of ozone layer.     (2)

4.  Mention three information obtained from the energy flow diagram.     (3)

5.  What are food chains and food webs? Why are smaller food chains better?     (4)

6.  Energy flow in a food chain is unidirectional. Explain     (3)

7.  Give any three methods to reduce the problem of waste disposal.     (3)

8.  Differentiate between natural and artificial ecosystem.     (2)

9.  Write the full form of UNEP.     (1)

10.  Write the names of any two decomposers.     (2)

Management of natural resources

Maximum time: 40 minutes

Maximum marks: 20 marks

1.   What are 3 R�s used to save environment? 1

2.   Why fossil fuels should be used judiciously?1

3.   Name any one stakeholder. 1

4.   What are the products formed when coal and petroleum are burnt? 2

5.   Why the forests are called as biodiversity hot spots? 2

6.   Name two industries based on forest produce. 2

7.   What are the advantages of water? explain it with respect to forest, wildlife and water resources.4

8.   Dams are constructed on the river for multipurpose use. Give its advantages and disadvantages. 4

9.   How does mining cause pollution? 2

10.   Why it is necessary to conserve water and wildlife? 1

How do Organisms Reproduce

Time taken: 40minutes

Maximum marks: 25 ma

1.   Name two nucleic acids? (1)

2.   What happens during copying of DNA? (1)

3.   Why does organism reproduce? (1)

4.   What is binary and multiple fission? Name the organism in which they occur. (3)

5.   How do potato and Bryophyllum plants reproduce vegetatively? (2)

6.   Devise an experiment to show germination of gram seed. (3)

7.   Draw well labeled diagram of a bisexual flower. (3)

8.   What is self and cross pollination? (2)

9.   State the functions of

       a. Testis

       b. Ovaries

       c. Vas deferens

       d. Stamen

       e. Pistil (5)

10.   What are the different methods of contraception in males and female human beings? (4)

Heredity and Evolution

MAXIMUM TIME: 40 MINUTES

MAXIMUM MARKS: 20 marks

1.   Name two human traits that show variation. (1)

2.   What is microevolution? (1)

3.   Who is known as �Father of genetics�? (1)

4.   Why evolution should not be equated with progress? (1)

5.   How many pairs of chromosomes do human beings have, specify the types of chromosomes also? (2)

6.   How is the sex of the child determined in human beings? (2)

7.   What is the speciation? How does it occur? (2)

8.   Define evolution. State Darwin�s theory of evolution. (5)

9.   What are the various evidences in factors of evolution? (4)

10.   Which of the following pair of sex chromosomes produces a male and a female child- XX or XY? (1)

Sample Paper for Chapter 2 Acid, Bases and Salt

MM: 20

Time: 25 mins

1.  Name two constituents of baking power.      (1 mark)

2.  What is universal indicator?      (1 mark)

3.  Name the chemicals that can be made of common salt      (1 mark)

4.  Why does cake become fluffy after adding baking soda?      (1 mark)

5.  Write the pH value, after which teeth start decaying?      (1 mark)

6.  State some uses of baking soda?      (2 marks)

7.  How is the concentration of hydroxide ions      (OH-) affected when excess base is dissolved in a solution of sodium hydroxide?      (2 mark)

8.  Name the gas evolved when dilute sulphuric acid acts on sodium carbonate.Write the chemical equation for the reaction involved.      (2 mark)

9.  What are the properties and uses of bleaching powder?(3 marks)

10.  Write a chemical formula to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open.      (2 marks)

11.  What happens when quick lime is added to water?      (2 marks)

12.  Write any two properties of acids.      (2 marks)