Subject: Science
Grade: X
Time: 90 mins
Marks: 40
General Instructions:
- The question paper comprises of four sections A, B, C and D. There are 17 questions in the question paper. All questions are compulsory
- Section A Question no 1 to 9 all questions and parts thereof are of one mark each.
- These questions contain multiple choice questions, very short answer questions. Answers to these should be given in one word or one sentence.
- Section B Question no 10 to 12 are short answer type question, carrying 2 marks each.
- Section C Question no 13 to 15 are short answer type questions, carrying 3 marks each.
- Section D Question no 16 to 17 are long answer type question carrying 5 marks each.
- There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
- Wherever necessary, neat and properly labelled diagrams should be drawn.
Section A
1. Chemically rust is:
a) Hydrated ferrous oxide
b) Only ferric oxide
c) Hydrated ferric oxide
d) None of these
2. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
a) KMnO4 is an oxidizing agent, it oxidises FeSO4.
b) FeSO4 acts as an oxidizing agent and oxidises KMnO4.
c) The colour disappears due to dilution; no reaction is involved.
d) KMnO4 is an unstable compound and de-composes in presence of FeSO4 to a colourless compound.
3. Which of the following statement about the reaction below are incorrect:
2PbO (s) + C (s) —– > 2Pb (s) + CO2 (g)
a) Lead is getting reduced
b) Carbon dioxide is getting oxidised
c) Lead oxide is getting oxidised
d) Lead is getting reduced
i) (a) and (b)
ii) (a) and (c)
iii) (a), (b) and (c)
iv) All
4. What prevents backflow of blood inside the heart during contraction:
a) Valves in heart
b) Thick muscular walls of ventricle
c) Thin walls of Atria
d) All of the above
5. Which of the following materials cannot be used to make a lens:
a) Water
b) Glass
c) Plastic
d) Clay
6. A ray of light is incident on the plane mirror normally. What are the angle of incidence and the angle of reflection?
7. The magnification of a mirror is + 1. What does it mean?
Question 8 and 9 contain five subparts. You are expected to solve any four out of them.
8. Read the following and answer the questions from 8.1 to 8.5:
Marbles popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.
8.1 The substance not likely to contain CaCO3 is:
a) Dolomite
b) A marble statue
c) Calcined Gypsum
d) Sea Shells
8.2 A gas is obtained on decomposition of Calcium Carbonate is a reactant for a very important biochemical process which occurs in plant in the presence of sunlight. Identify the name of the process:
a) Respiration
b) Photosynthesis
c) Transpiration
d) Photolysis
8.3 Marble are corroded or stained when they repeatedly come in to contact with polluted rain water. Identify the main reason:
a) Decomposition of calcium carbonate to calcium oxide
b) Polluted water is basic in nature hence it reacts with calcium carbonate
c) Polluted water is acidic in nature hence it reacts with calcium carbonate
d) Calcium carbonate dissolves in water to give calcium hydroxide
8.4 Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as oxidizing agent in the above process:
a) Sodium
b) Sodium oxide
c) Calcium
d) Calcium oxide
8.5 the reaction of water and quick lime is an example of
a) Combination reaction
b) Exothermic reaction
c) Both (i) and (ii)
d) None of these
9. Refer Table A & B that shows the blood pressure chart and blood pressure report of a patient:
Table A: Blood pressure chart
| Remarks | Systolic (mm of Hg) | Diastolic (mm of Hg) |
| Doctors advice required | 200 – 400 | 100 or higher |
| Good | 100 – 140 | 80 – 89 |
| Excellent | 120 | 80 |
Table B: Blood pressure report of a patient
| Checking time | Systolic (mm of Hg) | Diastolic (mm of Hg) |
| Blood pressure for a week | 130 – 150 | 100 – 120 |
9.1 Which disease of patient can be diagnosed from the given data:
a) Hypotension
b) Hypertension
c) Hyperthyroidism
d) Hypothyroidism
9.2 Refer Table A and find out the normal blood pressure value:
a) 140 -89 mm of Hg
b) 140 – 100 mm of Hg
c) 120 – 80 mm of Hg
d) 160 – 120 mm of Hg
9.3 Which instrument is used to measure blood pressure:
a) Sphygmomanometer
b) Manometer
c) Stethoscope
d) Barometer
Answer question number 9.4 and 9.5 on the basis of your understanding of the following paragraph and the related studies concepts:
Blood is a fluid connective tissue that circulates our body and delivers essential substances like oxygen to the body cells. It also transports metabolic waste products away from the cells. Figure alongside depicts the percentage composition of different components of blood. Blood cannot be made or manufactured outside the body. Blood donation is the only source for patients that need blood transfusion
9.4 In which component of blood, all the blood cells are suspended:
a) RBC
b) WBC
c) Platelets
d) Plasma
9.5 Name the component of blood that carries oxygen from the lungs to all the body tissues:
a) RBC
b) WBC
c) Platelets
d) Plasma
Section B
10. Give reason – colour of copper sulphate solution changes when an iron nail is dipped in it. Support your answer with a chemical equation.
11. a) The power of a lens is 5 dioptres What is its focal length?
b) A thin lens has a focal length of -12 cm. Is it a convex lens or a concave lens.
12. Write chemical equation when zinc granules react with:
a) Sulphuric acid
b) Sodium hydroxide
Section C
13. An object of size 7 cm is placed at 27 cm in front of concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a clear focused image can be obtained? Find the size and nature of image.
OR
a) State Snell’s law of reflection.
b) When a ray of light travelling in air enters obliquely into a glass slab, it is observed that the light rays emerges parallel to the incident ray but it is shifted sideways slightly. Draw a ray diagram to illustrate it.
14. a) What is the role of mucus in stomach?
b) How exit of food from stomach is regulated?
c) Where does food enters from stomach?
15. A reddish brown coloured metal, used in electrical wires, when powdered and heated strongly in an open china dish, its colour turns black. When hydrogen gas is passed over this black substance, it regains its original colour. Based on the above information, answer the following questions:
a) Name the metal and black coloured substance formed
b) Write balanced chemical equation for both the reaction.
Section D
16. a) Draw a diagram of human excretory system and label its important parts.
b) Name the two major components of normal human urine.
OR
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
17. Which lens can be used as a magnifying glass? For which position of object does a convex lens form:
a) Virtual and erect image?
b) A real and inverted image of same size as that of object? Draw labelled ray diagram to show the formation of the required image in each of the above two cases.