CBSE Science Practice Paper : Set XI
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.
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.
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 :
Pages: 1 2