» Class X Model Test Paper : CBSE Sample Question Papers

1. Why two similar charges repel each other?
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2. What is the principle of potentiometer?
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3. What is the name given to A. B + A. B gate?
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4. A wire of resistivity p is stretched so that its length becomes double and area half the original. How will the resitivity be affected?
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5. A lens is taken and a small piece of it is removed from the centre as shown in fig¬ure (b). How the focal length of the lens is going to be effected in comparison with original lens A?
Image
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6. Define resolving power of an instrument.
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7. Define magnitude of a star.
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8. Is dry cell really dry from inside? Explain in one, two lines.
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9. What is electromagnetic damping? Where is it used?
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10. If critical angle for a pair of medium is 30°, what is the angle of polarisation for the pair?
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11. Distance of Venus is 0. 7 A.U. Find the orbital period of Venus in terms of earth days.
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12. 1 atomic mass unit of substance is completely destroyed in a nuclear reaction, what is the energy produced in MeV?
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13. Frequency of incident radiations on a metal surface is tripled, how will K.E. of ejected electrons be effected?
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14. A 44 ohm resistor is used on 220 V supply for 2 hours. What are the expenses if 1 B.O.T. costs Rs.2-50?

15. A horizontal overhead power line carries a current of 5 A in west to east direction. What is the magnitude and direction of magnetic field due to current 2 - 5 m below the line ?
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16. What is the difference between resistance, reactance and impedance ? Who arc they connected?
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17. What is an optical fibre? Give one of its important applications.
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18. What is depletion layer? Draw these in case of forward and reverse biasing P-N junction diode.
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19. Find the minimum number of cells required to produce an electric current of 1 .5 A through a resistor of 30 ohm, given that the emfs of each cell is 1.5 V and internal resistance of each cell is 1 Ω.
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20. What are the laws of photoelectric emission? Explain these with the help of Einstein’s equation.
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21. Distinguish between conductors, semiconductors and insulators on the basis of their energy bonds.
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22. What are the laws of radioactive disintegration? Deduce the value of the number of atoms left after some time.
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23. Find the magnitude and direction of the force between two parallel conducting wires carrying current and hence define an ampere.
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24. What is solar constant? How does it help us to know the temperature of the sun?
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25. What is neutral temperature and temperature of inversion and thermoelectric power? What is thermoelectric power at neutral temperature?
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26. What is constringence? How is it related to refracting indices for different colours?
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27. Two small spheres each of mass 0. 09 kg hang by equal silk threads attached to the same point. The spheres are charged and made to touch each other. They come to rest with their centres 0.02 m apart and 0.20 m vertically below the point of support. Find the charge on each sphere
if g = 9-8 ms^-2.
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28. What is Huygen principle? How SnelFs law can be deduced using this principle?

OR
Twelve wires each of resistance 4 Ω are. Joined to form a skelton cube. Determine the resistance across any of the wire forming the cube.
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29. Describe principle, construction and working of a D.C. generator. How can smooth output be got from it?
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30. Deduce lens formula for convex len. Give sign conventions and assumptions followed.
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Section - A

1. What is the contribution of Edwin Hubble to space science ? 1
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2. What is meant by instantaneous rate of reaction ? 1
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3. What are raw materials used for manufacture of glass ? 1
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4. Name the substance used as (i) a moderator and (ii) a coolant in a nuclear reactor. 1
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5. Write structural formula of ethanoic acid. 1
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6. Write the conditions under which light undergoes total internal reflection. 2
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7. Name an alloy used in the making of permanent magnets. Give two uses of these magnets. 2
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8. What is corrosion ? Give conditions in which rusting of iron takes place. 2
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9. How is bleaching powder manufactured ? Give one use of bleaching powder. 2
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10. A 40W, 220V bulb is connected to 110V supply, find (i) Current flowing in the filament, (ii) Power consumed.

OR
A 60W, 220V bulb is connected to a 220V supply, find
(i) current (ii) Energy consumed in 1 hr. 2
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11. State two major objectives of space research programme in India also give its focal length. 3
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12. Write the nature of image formed by a plane mirror. 3
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13. Why is charcoal considered a better fuel than wood ? What are disadvantages of converted wood into charcoal ?
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What are amalgams ? Give two examples. Give two uses of amalgams. 3
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14. What is a fuse wire ? Name the materials used in making the fuse wire. How it is connected in the house ? How the connection differs from the normal connection used for other devices?
OR
What is solar cooker ? What is the range of temperature produced in 2-3 hours of use ? Give two
limitations and advantages. 3
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15. Discuss refraction in a glass slab and hence write the basic laws of refraction. 3
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Section - A

1. What is the wavelength range of visible light ? 1
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2. What are units of concentration ? 1
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3. What is meant by pyrex glass ? 1
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4. If the angle of incidence of a ray on a plane mirror is 30°, what is the angle of reflection ? 1
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5. What is meant by Tollen’s reagent ? Give one of its use. 1
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6. Find the power and focal length of a combination of 20 cm concave lens and 10 cm convex lens. 2
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7. What will happen to a conducting wire carrying current when placed in a magnetic field ? 2
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8. At 298 K, equilibrium concentrations of reactants and products of reaction : N₂ (g) + 3H₂(g) = 2NH₃(g)
[N₂] = 0.1 mol L^-1, [H₂] = 0.2 mol L^-1, [NH₃] = 0.3 mol I L^-1.
Calculate equilibrium constant at this temperature. 2
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9. Draw a neat labelled diagram of a simple microscope.

OR
Distinguish between Renewable and Non-renewable source of energy ? 2
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10. An object is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Find the (i) Position of image and (ii) magnification. 2
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11. How is slaked lime obtained from lime ? How is lime obtained from lime stone ? Give chemical equations. 3
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12. State Fleming’s left-hand rule ? How is it different from the Fleming’s Right-hand rule ? 3
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13. Write the chemical reactions of ethanoic acid with
(i) sodium metal (ii) sodium carbonate (iii) ethanol in presence of cone. H₂SO₄ (iv) soda lime
(v) LiAlH₄ (vi) Sodium bicarbonate. 3
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14. Explain the role of (i) black surfaces, (ii) reflector and (iii) glass cover in a box type solar cooker.

OR
Name the primary colours of light ? What are complimentary colours ? Explain by subtractive way how green colour is formed from blue and yellow pigments. 3
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15. What type of detergents are biodegradable ? What is the basic structure of detergents ? Why do they work well even with hard water ? Explain cleansing action of soaps and detergents. 3
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Section - A

1. Write the full form of the following :
(i)ASLV,(ii)ISRO. 1
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2. Define molarity. 1
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3. What happens when CL₂ gas is passed over dry slaked lime ? 1
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4. What are the limitations in harnessing solar energy ? 1
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5. Which glass is used for making wind screen of automobiles ? 1
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6. Why do we need sign convention in optics ? 2
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7. What are superconductors ? Give example. 2
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8. If 20% of uranium is to release energy in a bomb of 0.10 Kg, find energy released in MeV. Given: l MeV=1.6x l0^-13 J and c= 3x 10⁸ ms^-1 2
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9. Classify the following acids and bases in the categories of weak and strong :
(i) H₂SO₄, (ii) CH₃COOH, {iii) HC1O₄, (iv) H₂CO₃. 2
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10. Give two important uses of cement. 2
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11. Show how the nature of image formed by a concave mirror differs for object placed at two positions; (i) between/and pole, (ii) between/and R. 3
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12. A1500 W electric geyser is used for 2 hours everyday. Calculate the number of units of electrical energy that will be consumed in 30 days, If one unit costs Rs. 2, find the amount of the bill ?

OR
A 150 W fan is used for 12 hours a day, a 60 W bulb is used for 8 hours a day, calculate the energy consumed in 28 days. Express it in KWh. 3
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13. What is dispersion ? How and when does it form a spectrum of light ? 3
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14. How much energy will I kg mass of wood yield on complete combustion if its calorific value is 15 kJ/g ? 3
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15. Identify the charges acquired by ebonite rod when rubbed with fur material. What is the reason for it ? Does this obey the law of conservation of charge ? 3
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Section – A

1. What is the density of mass of a typical white dwarf star ? 1
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2. What are enzymes ? Give an example. 1
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3. Write chemical name and formula of baking soda, 1
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4. Name the orbit of the satellites that help in satellite communication. 1
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5, Give chemical equation for reaction of acetone with HCN. 1
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6. Write the significance of Faraday’s Constant. 2
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7. Name some devices used to tap solar energy. Give two limitations in its use. 2
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8. Calculate pH of 0.01 M NaOH solution assuming it to be fully ionised in aqueous solution. 2
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9, A family consumes 14.5 Kg of LPG in 28 days. Calculate the average energy consumed per day if the calorific value of LPG is 55 kJ/g. 2
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10. A satellite orbits a planet in a radins ‘r’ Derive a relation for the velocity of satellite in the orbit. 2
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11. Complete the following reactions :

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12. A star of mass 100 times that of the sun has come to red giant phase. Explain the next two phases in its life. 3
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13. Write structural formula of ethanoic acid. What is common name of pure ethanoic acid ? How will you prepare it from methanol ? Give chemical reaction involved and one use of ethanoic acid.

OR
{a) What is gypsum ? What happens when gypsum is heated to 373 K ?
(b) Define ‘calorific value of a fuel’. Amongst the following fuels, which one has the highest calorific value ?
C₂H₅OH,CH₄,C₂H₂.
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14. Two resistors 2Ω and 5Ω are connected as shown in the circuit.
Find (i) current drawn from cell,

(ii) Heat produced in each resistor in 2 minutes.

OR
If 2Ω and 5Ω resistors are connected in parallel to a 10 V cell, find (i) current in each resistor, (ii) ratio of heat produced in them. 3
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15. Write the reaction that takes place in a nuclear reactor. What is meant by enrichment of fuel ? When is a nuclear reactor said to have become critical ? 3
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Section - A

1. Name any two non-renewable sources of energy. 1
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2. Write any two examples of harmful radiations emitted by the nuclear wastes ? 1
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3. What will happen to white light on entering a prism ? 1
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4. Wright Me equation for laboratory preparation of hydrogen gas. 1
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5. Win-it a wire of resistance R, length / is made into a circle, what is the resistance between two points at the end of its diameter ?

OR
Why do we use semiconductors more in electronic devices. 1
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6. How can we use solar energy to overcome energy crisis ? 2
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7. Calculate pH of the solution when hydrogen ion concentration is 1.0 x 10^{-6 M. 2
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8. What is a wind mill ? Give two advantages and disadvantages of wind mill. 2
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9. What is meant by annealing of glass ? What type of glass do we get by this process ? 2
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10. If three 60 W bulbs are used for 6 hours a day and a tube light of 40 W is used for 4 hours, calculate the cost of electricity in a month of 30 days, if the cost of 1 unit is Rs. 2.50. 2
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11. Write two examples of ‘fossil fuel’. Why are they preferred over wood ? 3
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12. Draw a labelled diagram of Alternating current generator, 3
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13. What is total internal reflection ? Relate the angle of incidence and the refractive index for total internal reflection. Write the conditions necessary for total internal reflection. 3
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14. What are constituents of bronze ? Write its two main uses. Name the common constituent of brass, bronze and german silver.

OR
What type of mixtures are separated by fractional distillation ? Name the fraction of crude oil whose boiling point is more than 350⁰C. Where is it mostly used as a fuel ? 3
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15. What is the meaning of power of a lens ? When a convex lens of focal length 10 cm and concave lens of focal length 20 cm are placed in contact, find the equivalent focal length and power.

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A convex lens of 10 cm focal length and a concave lens of 20 cm focal length are kept in contact, how does the combination behave. Give reason. 3
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Section - A

1. What is meant by endothermic process ? Give one example. 1
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2. Name any two elements used for fabrication of solar cells. 1
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3. Who proposed the Big-Bang theory of the origin of Universe. 1
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4. What are strong acids ? Give one example. 1
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5. What is the magnification for a plane mirror ? 1
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6. What is formula of washing soda ? 2
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7. State Coulomb’s law of electric charges ? 2
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8. What is INSAT ? What are its objectives ?

OR
Give two major objectives of ISRO ? 2
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9. Calculate pH of 0.01 M HC1 if it is fully dissociated. 2
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10. A space shuttle utilises 100 Kg of liquid hydrogen during a flight. If the calorific value of hydrogen is 150 kJ/g, how much energy did it consume ? 2
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11. What are communication satellites ? Why don’t we use moon as a communication satellite ? 3
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12. What is meant by quenching of glass ? What type of glass do we get by this process ?

OR
Which one of the following reaction equations represents combustion of carbon and why ? Give another example of combustion reaction.
(i) 2C + O₂ ——-> 2CO
(ii) C + O₂ ——> CO₂
(iii) 3C + O₂ —-> 2CO + CO₂. 3

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13. What is electro-plating ? Explain the process with a diagram. Give two real life applications of the process. 3
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14. What is the significance of Oersted’s experiment ? Draw the magnetic field created by a long conductor carrying current. 3
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15. How will you prepare hydrogen gas in laboratory ? Draw a neat and labelled diagram and write chemical reaction involved. How will you test the presence of hydrogen gas ? 3
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Section - A

1. Relate the incident and emergent angle of light in a glass slab. 1
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2. What is meant by exothermic process ? Give one example. 1
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3. What is meant by catalyst ? 1
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4. If a wire of resistance R, length / made of material of resistivity p is cut into two equal parts, find the resistivity and resistance of the two pieces. 1
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5. Define pH. 1
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6. Name two materials used in the manufacture of solar cells. What is the efficiency of modern solar cells? 2
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7. Out of the two fuels C₄H₁₀ and C₄H₉OH, which one is expected to have a higher calorific value and why? 2
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8. Draw the ray diagram to show how a simple microscope magnifies.
OR
State Faraday’s law of electrolysis. 2
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9. Give two important properties of steel. 2
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10. Equilibrium constants for the reactions given below are provided in the right hand side at 298 K.

In which case, formation of products will be more favourable ? 2
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11. What is fuse wire ? Why do we need it ? How is it connected in electric networks ? 3
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12. Write chemical equations to show what happens when :
(i) Ammonia is passed over heated copper oxide.
(ii) CO is pased over heated ferric oxide. (iii) Sulphur powder is heated with concentrated HNO₃.

OR
How will you prepare sulphur dioxide gas in the laboratory ? Draw a neat and labelled diagram and write chemical reaction involved. Give two physical properties of SO₂. 3
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13. Write the mirror formula with proper sign convention. A convex mirror u^ed on an automobilehas radius of curvature of 3.00 m. Find the position and nature of image of a bus at a distance of 5.0 m from the mirror.
OR
A concave lens of focal length 10 cm is given. An ant 2 cm long stands vertically on the principal axis at a distance of 15 cm. Find the position and nature of image formed writing the lens formula, with proper sign convention. (1/,+72+2 = 3)
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14. Define rate of reaction. Calculate the rate of reaction of ion Cis-Platin with water between t₁ =20 minutes and t₂ = 40 minutes from the following table : 3

15. Write the basic principle and working of an electric motor. 3
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Section - A

1. The refractive index of water and glass are 1.33 and 1.5 respectively. Find the refractive index of water with respect to glass. 1
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2. Give one example of slow reaction. 1
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3. What is the role of rods and cones in human eye ? 1
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4. Write reaction of methanal with HCN. 1
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5. Why do we make conductors of heating devices made of an alloy instead of a pure metal ? 1
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6. What happens when calcium hydroxide is treated with chlorine gas ? Give chemical equation. 2
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7. How much solar energy is received in 1 m area in one hour.
Given : Solar constant is 1.4 kW per square metre ? 2
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8. What are primary colours and complementary colours. Give two examples each. 2
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9. Calculate pH of a solution having [H⁺] = 1.0 x l0^-4 mol L^-1. State whether the solution is acidic or basic.

OR
N₂O₄(g)=2NO₂, the concentration of [N₂O₄] = 4.0 x 10^-2 mol L^-1; [NO₂] = 1.5 x 10^-2 mol L^-1 at equilibrium. Calculate the value of equilibrium constant, 2
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10. Who first found that current can produce magnetic field ? Write the Right hand grip rule to find the direction of magnetic field. 2
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11. A white powdered solid, when added to water produces a hissing sound. Identify the compound. How does this compound react with moist hydrogen chloride gas ? Write the chemical equation. Give two uses of same compound. 3
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12. What is the source of Geothermal energy ? Name the places where this energy is tapped. 3
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13. Metals are electropositive in nature, why ? How are most reactive metals obtained from their ore ? Name the method and give one example of such metal.

OR
What is meant by refining of petroleum ? Name the process used for refining. Give name and uses of products obtained at 180^°C and 260^°C. 3
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14. What do you mean by summer and winter solstice ? 3
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15. Docs the nature of image formed by a concave mirror depend on the position of an object ? Show this with the help of two ray diagrams. 3
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Section - A

1. Write the nature of image formed by a plane mirror. 1
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2. Give one example of fast reaction. 1
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3. What do you mean by conventional current flow ? 1
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4. What is meant by esterification ? 1
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5. In what form does heat get transmitted in solar energy ? 1
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6. Express the average rate of reaction in terms of reactants and products for the following reaction : H₂(g) + l₂(g) ——>2HI(g). 2
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7. Name the products we get when a-particle hits a nitrogen nuclei.

OR
Complete the reaction giving reason :
₇N¹⁴ + ₂He⁴ ——>……….+ ₁H¹ 2
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8. What is persistence of vision ? How does this help in motion-picture projection ? 2
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9. Define the term ‘fuel1. What are primary and secondary fuels. ? To which classes of fuel do the following fuels belong :
Coke, Wood, Petroleum, LPG. 2
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10. Define the term electrolysis. Mention two uses in real life. 2
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11. What happens when lime stone is heated strongly ? Write the chemical equation. Give one use of lime stone. 3
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12. What is Nuclear fusion ? Explain with an example. 3
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13. Name the alloys which are used for following purpose, Give their composition :
(i) for soldering joints (ii) for making windows and door fittings (iii) for making equipment for feed and diary industry (iv) for making air crafts and kitchen ware. 3
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14. Define the following : (i) Launch vehicle, (ii) Polar orbits, (iii) Geostationary orbit. 3
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15. Draw a neat labelled diagram of a box-type solar cooker. Give reason for the use of black surface and reflector.

OR
Give reasons for the following events :
(0 Twinkling of stars, (ii) Mirage. 3
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