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Posted By: Aishwarya Member Level: Gold Posted Date: 24 Sep 2008
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2007 CBSE CBSE Science Practice Paper : Set XI Question paper
Section - A
1. What is the wavelength range of visible light ? 1
Answer :
2. What are units of concentration ? 1
Answer :
3. What is meant by pyrex glass ? 1
Answer :
4. If the angle of incidence of a ray on a plane mirror is 30°, what is the angle of reflection ? 1
Answer :
5. What is meant by Tollen’s reagent ? Give one of its use. 1
Answer :
6. Find the power and focal length of a combination of 20 cm concave lens and 10 cm convex lens. 2
Answer :
7. What will happen to a conducting wire carrying current when placed in a magnetic field ? 2
Answer :
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
Answer :
9. Draw a neat labelled diagram of a simple microscope.
OR
Distinguish between Renewable and Non-renewable source of energy ? 2
Answer :
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
Answer :
11. How is slaked lime obtained from lime ? How is lime obtained from lime stone ? Give chemical equations. 3
Answer :
12. State Fleming’s left-hand rule ? How is it different from the Fleming’s Right-hand rule ? 3
Answer :
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
Answer :
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
Answer :
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
Answer :
16. State Ohm’s law. Draw a electrical circuit with a battery, Resistance, Bulb and a Key. If the resistance 0f the bulb is equal to that of the resistor, and the potential of battery is V, find the current drawn from the cell? 3
Answer :
17. What happens when
(i) ammonia gas is oxidised in presence of air at 1873 K in presence of Pt. gauze. (ii) nitric oxide is oxidised in presence of oxygen. (iii) ammonia reacts with concentrated hydrochloric acid.
OR
Complete and balance the following reactions :
(i) Na + H2O—>
(ii) Zn + HC1 -> (iii) Fe2O3 +Al —> 3
Answer :
18. What is dispersion ? Which colour of light deviates more on passing through a prism ? When two prisms are placed together with one inverted and white light is passed, what will be the result ? 5
Answer :
19. Define calorific value of fuel. Why is calorific value of CH4 higher than that of butane ?
The heat produced on complete combustion of 10 g of fuel could raise the temperature of 2 kg of water from 20° to 70°C. Calculate the calorific value of the fuel, if the specific heat of capacity of water were 4.2 J/g°C. Assume that the heat taken by the container is negligible.
OR
How is biogas prepared ? Give its composition.
The calorific value of biogas is 40 kJ/g. Calculate amount of biogas required tp produce 1000 kJ of energy. 2+3
Answer :
20. What are Geostationary satellites ? How are they useful to mankind ? Derive the height at which the satellite can be serving as Geostationary satellite ? 5
Answer :
Section - B
21. What is a retrovirus ? !
Answer :
22. Name the procedure used in the working of artificial kidney. 1
Answer :
23. Why is SA node called pacemaker of the heart ? 1
Answer :
24. How does hydra reproduce ? Name another organism that reproduces by the similar method. 2
Answer :
25. Name two National Parks and two Sanctuaries of our country. 2
Answer :
26. Name the scientist who discarded Lamarck’s theory of inheritance of acquired characters ? How did he disprove of the theory ? 3
Answer :
27. Explain the various factors that affect the rate of photosynthesis in plants. 3
Answer :
28. Describe the mechanism of excretion in Amoeba. 3
Answer :
29. Name the type of non-biodegradable pollutant that can lead to harmful changes in the genes. Mention the measures that are to be taken to control this pollution. 3
Answer :
30. Explain with a diagram, the human male reproductive system. Mention the functions of human ovary.
OR
Explain with a diagram, the human female reproductive system. Mention the functions of human testis. 5
Answer :
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