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10th Class Science (Theory) Mock Question Paper

All questions are compulsory...

Science [All]

Central Board of Secondary Education [10]

4/27/2009Print This PageTell - A - FriendAdd to Wish ListReport Error

Mock Test

Class X Science

Time : 3 hours

Maximum marks: 60

General Instruction

(i) All questions are compulsory. However choice has been given in 5 marks question only.

(ii) Marks are indicated against each question.

(iii) Answer should be brief and to the point.

Q.1

You are provided with two solutions A and B having PH - 2 and 6 respectively. Which of them is strong acid and why?

1

Q.2

Name the functional group present in propanone and also given its structural formula.

1

Q.3

Identify the following :-  

(a) An alkali metal belonging to 3rd period.

(b) A halogen belonging to 2nd period.

1

Q.4

Mention one difference between the two common designs of solar cooker.

1

Q.5

What is the difference between real and virtual images?

1

Q.6

A solution of substance 'X' is used for white washi8ng. On mixing this substance in water, the water starts boiling even without heating:-

(a) Name the substance 'X'

(b) Write the reaction between 'X' and water.

(c) Give reason why water start boiling on addition of 'X' to it.

2

Q.7

Give reasons for the following:-

(a) Hydrogen gas is not evolved when metals react with nitric acid.

(b) Highly reactive metal oxides can not be reduced using carbon.

2

Q.8

A compound of sodium is an important ingredient in antacids.

(a) Identify the chemical substance and give its chemical formula.

(b) What happens when the compound is heated strongly? Give the chemical equation for the above change.

2

Q.9

Why is nuclear fusion not preferred for generating electricity for domestic purpose?

2

Q.10

What is Presbyopia? How can it be corrected?

2

Q.11

Draw the diagram for domestic electric circuit.

2

Q.12

A 100 watt bulb is lighted for 2 hours daily, and four 40 watt bulbs are lighted for four hours daily. Calculate the energy consumed in 30 days and cost of using the bulbs at the rate of Rs. 2. 50 per unit.

2

Q13

Why is the colour of clear sky blue?

2

Q.14

(a) What do you understand by isomers? Give the structural formula of all possible isomers of pentane.

(b) Give the IUPAC name and structural formula of a carboxylic acid containing four carbon atoms.

3

Q.15

Identify the following on the basis of the table given:-

GROUPS / PERIODS

1

2

3 - 12

13

14

15

16

17

18

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

2

X

Q

 

 

 

 

Y

 

Z

3

 

 

 

 

 

 

 

P

 

4

 

R

 

 

 

 

 

S

 

(a) element that has single electron in the valence shell.

(b) element which is inert.

(c) element which will form covalent compounds.

(d) a non metal with valency 1

(e) most reactive metal

(f) name the bond that can be formed between X and P.
 

3

Q.16

An object of size 5 cm is placed at a distance of 25 cm from the pole of a concave mirror of radius of curvature 30 cm. Calculate the distance of image and size of image. What will be the nature of the image?

3

Q.17

(a) What is an activity series of metals? Arrange the metal Zn, Mg, Al, Cu and Fe in a decreasing order of reactivity?

(b) What would you observe when (write equation)

(i) put some zinc pieces into the blue copper sulphate solution.

(ii) Dilute hydrochloric acid is poured on a magnesium ribbon taken in a test tube.

(c) Mention the constituents of alloy:-

(i) Stainless steel

 (ii) Brass

                                 OR

 (a) Complete the following equations:-

(i) C2H5OH + CH3COOH --------------

(ii) CH3COOH + NaHCO3 --------------

 (b)           (i) In the electrolytic refining of a metal 'M'. What would you take as anode, the cathode and the electrolyte?

                (ii) With the help of a labelled diagram, explain the electrolytic refining of copper.

5

Q.18

(a) Draw the diagram of an AC generator. What is the principle behind it?

 (b) Name the process by which energy is released in the sun.

 (c) Why is the third wire of earth connected in domestic electric appliances?

                OR

 (a) Draw the diagram of an electric motor. What is its underlying principle? (2 +1)

 (b) Mention one limitation in using a solar cell.

(c) What is short circuiting?

2+1

1

1



2+1


1

1

Section B

Q.1

From the list given below, pick out the items which can be recycled:

Used clothes, glass bottles, polythene  carry bags, vegetable peels.

1

Q.2

What is the name given to the main program for replenishment of forest?

1

Q.3

Write one plant hormone that helps in cell elongation and one animal hormone that controls the metabolism of carbohydrates, fats and proteins.

1

Q.4

List two ways of family planning. Write about any one.

2

Q.5

Name any two types of neurons. How is the functioning of one different from the other?

2

Q.6

 How degraded Sal trees forests of Arabari forest range in Midnapore district were protected? What ways were followed to save them?

2

Q.7

Draw a labelled diagram of Human Heart, Label Pulmonary Artery, Pulmonary Vein, Right Atrium, Vena Cava, Aorta, Left Ventricle.

3

Q.8

 (i) Which of the organs perform the following functions:-

        (a) Absorption of food   (b) Absorption of water

(ii) After fertilization in plants name the parts of a flower, which develops into fruit and the seeds.

(iii) In respiration air passes through :-

        (a) Pharynx, Nasal Cavity, Larynx, Trachea, Bronchi, Bronchiole, Lungs.

        (b) Nasal Cavity, Pharynx, Larynx, Trachea, Bronchi, Bronchiole, Lungs.

        (c) Larynx, Nasal Cavity, Pharynx, Trachea, Lungs.

         (d) Larynx, Pharynx, Trachea, Lungs. (Choose the right option)

3

Q.9

 (i) How can you explain the gender of a child is not decided by mother's contribution?  Draw a flow diagram to support your answer.

(ii) Name one organ analogous to the wing of a bird. Why are they both analogous? Give reason.

(iii) Identify the organisms belonging to the third trophic level by constructing a food chain comprising of the following organisms. Snake, Hawk, Mice, Plants

OR

A tall pea plant with round seeds is crossed with a short pea plant with wrinkled seeds. Tallness and round seeds are the dominant traits. What will be the F1 generation and F2 generation? You can use letters T for tallness and t for short, R for round and r for wrinkled seed trait.

5

4/27/2009Print This PageTell - A - FriendAdd to Wish ListReport Error

Related Words:

Propanone, Alkali Metal, Hydrogen Gas, Chemical Formula, Nuclear Fusion, Presbyopia, Domestic Electric Circuit, Isomers, Carboxylic Acid, IUPAC Name, Carbon Atoms, Cathode, Electrolyte, Domestic Electric Appliances, Polythene Carry Bags, Vegetable Peels, Human Heart, Pulmonary Artery, Pulmonary Vein, Right Atrium, Vena Cava, Aorta, Left Ventricle, Pharynx, Nasal Cavity, Larynx, Trachea, Bronchi, Bronchiole, Lungs, 10th class mock test papers, 10th class dummy question paper

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