Modal papper science 10th CBSC 2013 -14


Science
Time: 3 to 3 ½ hours Max. Marks: 80
Term 1 – Summative Assessment
Science (Theory)
Question Paper Set – 1
Instructions:
1. The question paper consists of two sections, A and B. You are to attempt both the sections.
2. All questions are compulsory.
3. There is no overall choice. However, internal choice has been provided in all the three questions
of five marks each. You have to attempt only one option in each question.
4. All questions in Section A and all questions in Section B are to be attempted separately.
5. Question numbers 1 to 4 in Section A carry 1 mark each. These are to be answered in one word
or one sentence each.
6. Question numbers 5 to 13 carry 2 marks each. These are to be answered in about 30 words
each.
7. Question numbers 14 to 22 carry 3 marks each. These are to be answered in about 50 words
each.
8. Question numbers 23 to 25 carry 5 marks each. These are to be answered in about 70 words
each.
9. Question numbers 26 to 41 in Section B are multiple-choice questions based on practical skills.
Each question carries one mark. You are to choose the most appropriate answer from among the
options given.
Section A
1. Write the valence shell configuration of an element “X” with the atomic number 13.
2. What gas is evolved when lead nitrate is heated?
3. State and define the unit of electrical resistance.
4. By what process is biogas produced in the digester of a biogas plant?
5. State the chemical property on which the following uses of baking soda are based: a) As a
constituent of baking powder
b) As an antacid
6. Differentiate between calcination and roasting. Which of the two is employed for the extraction of
sulphide ores?
7. Write a balanced equation for the reaction between aluminium sulphate and sodium hydroxide.
Also indicate that one of the products Al(OH)3 is an insoluble product.
8. In the laboratory, most reagents are stored in transparent glass bottles, while some are stored in
brown bottles. A solution of silver nitrate is stored in a brown bottle. Why?
9. There are three resistors, each having a resistance of 2 Ω
(a) How can these be connected to get the maximum resistance? What is the maximum
resistance?
(b) What is the least possible resistance that can be obtained by combining these resistors?

What type of combination is required for obtaining it? (1, 1)
10. An electric iron is rated at 1500 W. If the iron is used for 3 hours every day, find the number of
units it consumes in the month of February 2008.
11. (a) Why don’t two magnetic field lines intersect?
(b) What is the nature of the magnetic field lines formed due to a straight current – carrying
conductor?
12. Why is the rate of breathing in aquatic organisms faster than in terrestrial organisms?
13. On certain plain areas on land, the speed of wind is of the order of 15 km/h. Discuss how this
wind can be harnessed to generate electricity.
14. Balance the following equations:
15. i. An aqueous solution has a pH equal to 2. What do you infer about its acidic or basic
character?
ii. What is the role of pH in tooth decay?
iii. What is the colour of methyl orange in a) an acidic medium b) a basic medium?
16. i. What gas is usually liberated when an acid reacts with a metal?
ii. What is a neutralisation reaction? Give a practical application of it.
17. a. What are the fourth and fifth states of matter? (1 mark)
b. What symbols are used to represent following units? (i) kelvin (ii) pascal (1)
c. Define sublimation. (1)
18. Find the equivalent resistances in the following cases:
A) A series combination of four resistors of resistances 0.5 Ω, 2.5 Ω, 3 Ω and 4 Ω.
B) A parallel combination of three resistors of resistances 3 Ω, 4 Ω and 6 Ω.
C) Two resistors of resistance 3 Ω and 6 Ω are first connected in series, and the combination is
then connected in parallel with a resistor of resistance 9 Ω. (1, 1, 1)
19. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet
is (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii) held stationary inside the coil? (1,
1, 1)
20. Define each of the following in a sentence each:
a. Positive tropism
b. Phototropism
c. Geotropism
d. Hydrotropism
e. Thigmo tropism
f. Chemotropism
21. Draw a diagram of a reflex arc and label the following parts:
a. The nerve that carries impulses from receptors
b. Interneuron or association neuron
c. The nerve that carries information to a muscle
22. How are nuclear reactions different from chemical reactions?
23. Railway tracks can be welded using a displacement reaction
a. Name the process.
b. Write a balanced equation for the process.
c. Is the reaction exothermic or endothermic?
d. From the equation you wrote in (b), identify:
a. The element getting oxidised
b. The element getting reduced

c. The substance behaving as an oxidising agent
d. The substance behaving as a reducing agent
Or
Give reasons:
a. Metals are good conductors of electricity.
b. Sodium is kept under kerosene.
c. Metals are not found in their native state in nature.
d. Silver does not displace hydrogen from acid solutions.
e. An iron rod dipped in copper sulphate solution turns the blue solution light green.
24. Draw the pattern of magnetic field lines around a circular current-carrying conductor. How does
the pattern change if the number of loops is increased to form a helical shape? How can we
increase the magnetic field due to the current in the spiral coil?
Or
(Draw a schematic diagram of an electric motor and label it. Explain its principle and working.
What is the function of a split ring in an electric motor?
25. Draw a diagram of the digestive system and label the following parts:
a. The part that helps in deglutition
b. The part where no digestion occurs and which connects the mouth with the stomach
c. The organ that has both pyloric and cardiac sphincters
d. The part where disaccharides get converted into monosaccharides
e. The part where water is absorbed from unabsorbed food
Or
Draw a diagram of the respiratory system and label the following parts:
a. The part that humidifies air
b. The part where exchange of gases takes place
c. The part that protects the trachea from closing and collapsing
d. The muscular partition that separates the thoracic cavity from the abdominal cavity
e. The voice box
f. The skeletal structure that protects the lungs from either side
Section B
26. A student dropped some pieces of marble in dilute HCl in a test tube. The gas evolved was
passed through limewater. What change would be observed in limewater? (a) Becomes
colourless (b) Changes to milky white (c) Changes to black (d) No significant change
27. What change takes place when zinc is treated with dilute nitric sulphuric acid? (a) Hydrogen is
evolved (b) Nitrogen is evolved (c) Nitrogen dioxide is evolved (d) No Ammonia gas is released
28. What change takes place when sulphuric acid is added to a test tube containing water? (a) Test
tube becomes cold (b) Test tube becomes hot (c) No significant change in temperature (d) A
pungent gas is released
29. An aqueous solution of a salt turns red litmus blue. What would be the pH of that salt? (a) 4 (b) 2
(c) 7 (d) 13
30. Blue copper sulphate solution is added to a test tube containing zinc granules. What will be the
colour of the resulting solution? (a) White (b) Blue (c) Green (d) Black
31.
32. Which of the following is a non-ohmic conductor? (a) Copper (b) Aluminium (c) Silicon (d) Iron
33. Which of the following physical quantities of a conductor should be maintained in order to satisfy
Ohm’s law? (a) Length (b) Area of cross-section (c) Temperature (d) Colour
34. The commercial unit of electrical energy is: (a) Volt (b) Watt (c) Watt-hour (d) Kilowatt-hour
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35. In an experiment related to electricity, which of the following is false? (a) An ammeter is always
connected in series (b) A voltmeter is always connected in parallel (c) The positive terminal of a
battery is always connected to the positive terminal of the ammeter in the circuit
(d) The negative terminal of a battery can be connected to the positive terminal of a voltmeter
36. In which of the following groups of organisms is food material broken down outside the body and
then absorbed? (a) Euglena, Hibiscus, Drosera (b) Yeast, Mucor, Aspergillus (c) Man, Dog,
Elephant (d) Lice, Mosquito, Bed bug
37. The reserve cellular energies in autotrophs and heterotrophs respectively are: (a) Starch and
glycogen (b) Glycogen and starch (c) Proteins and fats (d) Carbohydrates and proteins
38. In which of the following groups is single circuit circulation seen? (a) Dog, Cat, Buffalo (b)
Monkey, Apes, Lion (c) Catla catla, Exocoetus, Scoliodon (d) Crocodile, Najanaja, Gallus gallus
39. Which of the following is not produced in the respiration of yeast? (a) Adenosine Tri Phosphate
(b) Ethyl alcohol (c) Carbon dioxide (d) Water
40. Oxygenated blood is sent to the heart muscles through the: (a) Brachial artery (b) Pulmonary
artery (c) Coronary artery (d) Femoral artery
41. The phloem in plants is responsible for the transport of: (a) Sugars (b) Water and mineral salts
(c) Sugars, water and mineral salts (d) Chitin

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One thought on “Modal papper science 10th CBSC 2013 -14

  1. How can we improve our secondary science teaching and learning?The quality of science teaching and learning continues to be an area of concern. When it is inadequate, it is often the lack of a sufficient number of highly-qualified and dedicated science teachers that is cited as the problem.Subject knowledge is important. However, we should not neglect the need to be able to get a subject across. Primary school science teachers may not always have the subject knowledge but they are generally adept at using the knowledge that they have to enable pupils to understand the concepts. The teacher who knows the student or the teacher who knows the subject, it’s finding the balance between the two. improving your science curriculum and teaching methodology to enthuse and motivate your students.MotivationIt is vital that your curriculum motivates and inspires the scientists of the future. With careful planning and a measure of rigour, integrated learning can be particularly motivating. Bringing subjects together to address a problem that students see as ‘real’ can enthuse them as well as helping them see the role of the scientist in society. and deliver integrated science, technology, engineering and mathematics activities.One way of improving the attitude of students towards science is through the use of IT. Although a slightly older article, ‘Science then and now’ does highlight some ways in which IT might be used to heighten understanding of the basic concepts. Although practical activities remain a priority, IT can enhance the understanding that pupils have of how results are obtained and what has actually occurred during the experiment.The links between IT and science are probably more self-evident than those between PE and science. And yet some schools are increasing interest in science through using PE as a channel. investigating activities such as kicking, hitting, jumping, firing etc. IT also has a major focus here with the use of video analysis systems and data capture from sensors. projects taking place in different schools designed to inspire and enthuse students and make their learning relevant.activities.Good principles for science education——-Pupils need to be enabled to share and discuss science-based issues. This requires a level of scientific literacy.for the importance of developing a scientific dialogue in ‘Scientific Literacy Through Dialogue.The project is grounded in some sound teaching and learning principles. For example, that students are more likely to remember and apply something when they have discovered it for themselves. It also emphasises the importance of providing students with some facts and knowledge or ‘concrete preparation’ which allows them to explore the real problem with more freedom. Field trips and practical ‘hands on’ experience are as valuable to secondary-age students as they are vital to primary. Taking science out of the classroom can bring students into the laboratory. That’s when you know your teaching has taken effect.

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