This Question Paper consists of 30 questions and 11 printed pages.
? ?-? ? 30 ? ? 11 ? ? ?
| Roll No. | Code No. |
| ? | ?: 49/HIS/1 |
SCIENCE AND TECHNOLOGY Set A
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(212)
Day and Date of Examination
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| Signature of Invigilators | 1. |
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- ? ? ? ? ? ? (A), (B), (C) ? (D) ? ? ? ? ? ? ? ? ? ? ?-? ? ? ? ? ?
- ? ? ? ?-? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- ?-? ? ?-? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- ? ?-? ? ? ? ? ? 49/HIS/1-A ?
- (?) ? ? ? /? ? ? ? ?, ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? : ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ? ? ? ?- ?-? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- (?) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?/? ? ? ? ? ?
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Time : 2½ Hours ] [Maximum Marks : 85
? : 2½ ? ] [ ? : 85
SCIENCE AND TECHNOLOGY
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( ? ? ?)
(212)
Note : (1) All questions are compulsory.
(2) Marks are indicated against each question.
? : (1) ? ? ? ?
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(2) ? ? ? ? ? ? ? ? ?
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An element 'X' reacts with oxygen to form oxide. This oxide dissolves in water to form a solution which turns blue litmus red. This oxide also reacts with NaOH to form salt. The element 'X' is : 1
(A) Carbon (B) Sodium
(C) Calcium (D) Magnesium
? ? ‘X' ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? NaOH ? ? ? ? ? ? ? ? 'X' ? :
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(A) ? (B) ?
(C) ? (D) ?
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Which of the following is not the characteristic of ‘Xerophytes' ? 1
(A) Succulent leaves and stems (B) Few or no leaves
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(C) Large number of stomata (D) Deep wide spread root system
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(A) ? ? ? ? (B) ? ? ? ? ? ? ? ? ? ?
(C) ? ? ? ? ? ? (D) ? ?-?
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The clouds formed in the sky are an example of : 1
(A) Emulsion (B) Suspension (C) Foam (D) Aerosol
? ? ? ? ? ? :
(A) ? ? (B) ? ? (C) ? ? (D) ? ?
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When the fingers of a person accidently touch a hot metal object, he withdraws fingers instantaneously. This involuntary action of the person is controlled by : 1
(A) Cerebrum (B) Cerebellum
(C) Medulla oblongata (D) Spinal cord
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(A) ? (B) ?
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(C) ? ? (D) ?-?
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What will happen if two electric bulbs of 25 W and 100 W both rated at 220 V are connected to the main 220 V supply in series ? 1
(A) Electric bulb of 100 W will only glow
(B) Both electric bulbs will glow with equal brightness
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(C) Electric bulb of 100 W will glow brighter than electric bulb of 25 W
(D) Electric bulb of 25 W will glow brighter than electric bulb of 100 W
220 V ? ? ? ? ? ? ? ? 25 W ? 100 W ? ? ? ? ? 220 V ? ? ? ? ? ? ? ? ?
(A) ? 100 W ? ? ? ? ?
(B) ? ? ? ? ? ? ? ?
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(C) 25 W ? ? ? ? ? 100 W ? ? ? ? ? ? ? ?
(D) 100 W ? ? ? ? ? 25 W ? ? ? ? ? ? ? ?
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Which of the following communicable diseases is caused by virus ? 1
(A) Amoebiasis (B) Dengue fever
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(C) Malaria (D) Tuberculosis
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(A) ? (B) ? ?
(C) ? (D) ?
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In water purifiers, which of the following form of carbon is used for adsorbing coloured impurities and foul odours from water ? 1
(A) Graphite (B) Coke
(C) Activated charcoal (D) Carbon black
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(A) ? (B) ?
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(C) ? ? (? ? ?) (D) ? ?
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Which of the following processes is not an exothermic reaction ? 1
(A) The process of digestion of food by human beings
(B) The rusting of iron nails
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(C) The decomposition of vegetable matter into compost
(D) Burning of natural gas
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(A) ? ? ? ? ? ?
(B) ? ? ? ? ? ?
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(C) ? ? ? ? ? ? ? ?
(D) ? ? ? ?
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Two spring balances A and B are being pulled apart as shown in the figure given below : 1
A B
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4 N
←The reading in balance B is 4 N. The reading in balance A will be :
(A) zero (B) 2 N (C) 4 N (D) 8 N
? ? ? A ? B ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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A B
4 N
←? ? B ? ? 4 N ? ? ? A ? ? ? :
(A) ? (B) 2 N (C) 4 N (D) 8 N
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A chemical factory discharges its waste that is rich in nitrates into a water body. How does it affect the population of fishes in the water bodies ? Explain. 2
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Why is it wrong to blame a mother only for giving birth to a female child ? Explain with the help of chromosomal basis of sex determination. 2
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State law of constant proportion. In magnesium oxide, magnesium and oxygen are present in the ratio of 3 : 2 by mass. In a chemical reaction 6 g magnesium powder was ignited in a container having 12 g of pure oxygen. After the completion of the chemical reaction, it was found that 8 g of oxygen was left unreacted. Show that these observations are in accordance with the law of constant proportions. 2
? ? ? ? ? ? ? ? ? ? ? ? 3 : 2 ? ? ? ? ? ? ? ? 6g ? ? ? ?, ? 12 g ? ? ?, ? ? ? ? ? ? ? 8 g ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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On what factors does the buoyant force acting on a body immersed in a fluid depend ? What will happen when the buoyant force acting on a body is equal to its own weight ? 2
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Draw symbols of the following devices used in electric circuit diagram : 2
(i) Battery (ii) A closed plug key
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(iii) Electric fuse and (iv) An electric bulb
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(i) ? (ii) ? ? ?
(iii) ? ? ? (iv) ? ?
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Name the part of human cell which contains network of chromosomes present as chromatin. Write one function of this part. 2
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What is the cause of rainbow formation during the rainy season? Which of the seven colours seen in rainbow has 2
(i) maximum wavelength and (ii) minimum wavelength ?
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? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
(i) ? ? ?, ? (ii) ? ? ? ?
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Differentiate between base SI units and derived SI units. Derive the SI unit of weight. 4
? SI ? ? ? SI ? ? ? ? ? ? SI ? ? ?
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Give reasons for the following : 4
(i) Treaded tyres are used in a car instead of flat tyres.
(ii) When we shake a wet piece of cloth after washing, water droplets come out of it.
? ? ? ? ? :
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(i) ? ? ? ? ? ? ? ? ? ? ? ? ?
(ii) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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Draw the chemical structure of Butane and Isobutane. Justify that they are isomers. 4
? ? ? ? ? ? ? ? ? ? ? ? ? ?
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List the raw materials required for the manufacture of bleaching powder. Describe the method to manufacture it with the help of a labelled diagram. Write the chemical equation for the reaction involved. 4
? ? ? ? ? ? ? ? ? ? ? (? ?) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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Write Darwin's two major contributions with regard to evolution. What is the function of 'Natural Selection' ? With which group of animals do humans share their immediate ancestors ? 4
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? ? ? ? ? ? ? ? ‘? ?' ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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(a) Can a bimetallic strip made of silver and brass be used as thermostat in heating and cooling devices ? Give reasons for your answer. 4
(Given a for brass and silver = 18×10-6 per degree Celsius)
(b) All other conditions remaining identical which will cause more severe burns steam at 100°C or water at 100°C ? Give reasons for your answer.
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(a) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
(? ?; ? ? ? ? ? a ? ? 18×10-6 °C-1 ?)
(b) ? ? ? ? ? ? 100° C ? ? ? 100°C ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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What is meant by ozone hole ? Explain the causes for its formation over Antarctic regions. Why is the formation of ozone hole a cause of worry for human beings? Give two important reasons in support of your answer. 4
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Describe the unique property of water in respect of its thermal expansion as compared to other liquids. Explain, why aquatic animals living in a lake of very cold region do not die in severe winter despite of frozen surface of lake ? 4
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Three elements ‘X', 'Y' and 'Z' have atomic number 17, 01 and 11. 'X' reacts with 'Y' and 'Z' separately. What type of bond will be formed between ‘X' and 'Y', and ‘X' and ‘Z' ? Write the formulae of the compounds formed by the reaction between ‘X', 'Y' and ‘X', 'Z'. Compare the electrical conductivities of these two compounds and mention the causes for difference. 4
? ? 'X', 'Y' ? 'Z' ? ? ? ? 17, 01 ? 11 ? 'X' ?-? 'Y' ? 'Z' ? ? ? ? ‘X' ? 'Y' ? ‘X' ? ‘Z' ? ? ? ? ? ? ? ? 'X' ? 'Y' ? 'X' ? 'Z' ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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Now-a-days why are farmers being encouraged to use organic manure as a major alternative to fertilizers. Name any three organic manures. Describe how can we use waste vegetable peels, rotten vegetable, leaves and grass etc. to prepare organic manure ? 4
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?, ?-? ?, ? ? ?-? ? ? ? ? ? ? ? ? ? ?
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(a) Consider the following chemical reaction between iron and sulphur : 4
heat
Fe (s) + S (s) ?Fe S (s)In terms of loss and gain of electrons, explain to which type of reaction is this.
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(b) Why do the potato chips manufacturers usually flush in nitrogen gas bags of fried potato chips? Explain.
(a) ? ? ? ? ? ? ? ? ? ? ? ? ? :
heat
Fe (s) + S (s) ?Fe S (s)? ? ? ? ? ? ? ? ? ? ? ? ?
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(b) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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Draw a simple diagram of human excretory system and label (i) kidneys (ii) ureters (iii) urinary bladder and (iv) urethra on it. Write the functions of kidneys. Why is it possible to survive even with one kidney ? Name any one technique which can be used to save a patient whose both kidneys are damaged. 6
? ? ? ? ? ? ? ? ? ? (i) ? (ii) ? (iii) ? ? (iv) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?, ? ? ? ? ? ? ? ? ? ? ?
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Explain three reasons of accidents that may be caused in our household circuits using electricity. Describe the role of the following safety devices in preventing these accidents. Explain. 6
(i) Electrical fuse (ii) Earthing of electrical appliance
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
(i) ? ? (ii) ? ? ? ?
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(a) State the postulates of Bohr's model of atom. How could it solve the problem of stability of atom faced by Rutherford model of atom ? 6
(b) The atomic number of sulphur is 16. Draw its structure according to Bohr model of atom. What is the number of electrons in its M and N shells ? Write valency of sulphur atom.
(a) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
(b) ? ? ? ? 16 ? ? ? ? ? ? ? ? ? M ? N ? ? ? ? ? ?-? ? ? ? ? ? ?
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This download link is referred from the post: NIOS 10th Class (Secondary) Last 10 Years 2010-2020 Previous Question Papers || National Institute of Open Schooling
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