MANOJ KUMAR (SHELFORD)

Sunday, June 16, 2013

Revision test - 1 (Chemical reactions, life processes, Electricity)

16th June, 2013, STRT -1, Full marks – 45, Time – 1 ½ hr
1.     Write balanced equation for the following chemical reactions (a)Hydrogen + Chlorine à Hydrogen chloride (b)Sodium + Water à Sodium hydroxide + Hydrogen (c)Sodium hydroxide solution (in water) reacts hydrochloric acid solution (in water) to produce sodium chloride solution and water.
2.     Differentiate between respiration and photosynthesis, write their equation and balance them, what happens to glucose in aerobic, anaerobic respiration.[5]
3.     In an experiment with iron nail dipped in copper sulphate solution, why does the iron nail become brownish in colour and blue colour of copper sulphate solution disappear. [3]
4.     Give a balanced example each of (a) double displacement (b) exothermic (c) endothermic (d)double displacement reaction[4
5.     What are the benefits of separation of oxygenated blood from deoxygenated blood in mammals and aves. With the help of a diagram show the course of flow of blood in human circulatory system. What are the components of transport system in human beings? [2+2+1]
6.     Describe the structure and functioning of nephrons. What are the necessary conditions for autotrophic nutrition and what are its byproducts. [3+2]
7.     Differentiate between artery and veins.         [5]
8.     How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Ω? (b) How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater coil is 100 Ω?[5]
9.     An electric lamp, whose resistance is 20 Ω, and a conductor of 4 Ω resistance are connected to a 6 V battery in series.  Calculate (a) the total resistance of the circuit, (b) the current through the circuit, and (c) the potential difference across the electric lamp and conductor. [5]
10.                        What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? [3]

11.                        Derive an equation for a system of resistors in series. [2]

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