» CBSE Science Practice Paper : Set VI : CBSE Sample Question Papers

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.
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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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