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CBSE X 2008 - Biology (What is responsible for coating on coins?)
A student has been collecting silver coins and copper coins .One day,she observed a black coating on silver coins and a green coating on copper coins. which chemical phenonmenon is responsible for these coating on coins? Write the chemical names for the black and green coatings. CBSE -X- 2008 | 2 marks |
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CBSE X 2008 - Chemistry (Questions on Carbon Compounds)
Why does carbon form largest number of compounds? Which of these two ( saturated and unsaturated) is more reactive? Write the names of the compounds. CBSE X 2008 | 5 marks |
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CBSE X 2008 - Physics (Question on Refractive Indices)
The following table gives the values of Refractive Indices of a few media. Use this table to give an eg. of a medium pair i) Where light speeds up when it goes from one medium to other ii) Where light slows down when it goes from one medium to other. CBSE X 2008 | 1 mark |
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CBSE X 2008 - Physics (Draw a Circuit Diagram showing all Connections)
You are given three resistors of 10 W, 10 W and 20 W, a battery of emf 2.5 V, a key, an ammeter and a voltmeter. Draw a circuit diagram showing the correct connections of all given components such that the voltmeter gives a reading of 2.0 V. CBSE - X 2008 | 1 mark |
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CBSE X 2008 - Physics (Power of Lenses)
(a) Two lenses have power of (i) +2D (ii) -4D. What is the nature and focal length of each lens? (b) An object is kept at a distance of 100 cm from each of the above lenses. Calculate the (i) image distance (ii) magnification in each of the two cases. CBSE X 2008 | 3 marks |
