CBSE sample paper2 class X Science 2011

http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com ttIIProtonSample Question Paper – 2011 Class – X Subject –Science (PHYSICS /CHEMISTRY) MM : 80 Sec-A Q.1 Give one example of redox reaction which is also displacement reaction. 1x3=3 Q.2 Electrical Resistivity of few material is givenin ohm-meter. Which of these can be used for heating element (give reason) x = 6.92 x 10-8, y = 2.9 x 105, z = 3.9 x 106, p = 2x10-4, q =4x10-5 Q.3 Name and state the rule which gives the direction of induced current. Sec-B 2x7=14 Q.4 A proton enters a magnetic field at right angles to it as shown in fig. what is the direction of force acting on the proton. Q.5 What is a major constituent of Biogas (Gobar Gas)? How is Biogas superior to dry animal dung as a fuel. Q.6 A radio set of 60w runs for 50 hrs. how much energy is consumed (Joules & KWH). Q.7 A baker found that cake prepared is hard and small in size. Which ingredient has he for gotten to add? Write the name and formula of ingredient and explain how it would be help to make cake spongy and soft. Q.8 Write the Lewis dot structure of (a) H2S (b) Calcium Chloride Q.9 An aqueous solution has hydrogen ion concentration (H+) = 1x10-9 mol L-1 (a)Is solution acidic or basic (b)what is the pH of solution (c)How would its pH changes on adding few drops of 1M HCl to it explain Q10 Why metals replace hydrogen from dilute acids where non metal do not ? Explain Q11 You are given following current time graphs from two different sources (a ) Name the type of current in two cases(b)what is the frequency of current in case II in India © Which one is prefer over another why Q12 Draw a schematic diagram of circuit consisting battery of 12V , three resistors of 5 ohm,10 ohm, and 20ohm connected in parallel.Show an ammeter and voltmeter to measure current and pot. Diff. also calculate the current in circuit Q13 Draw a sketch of pattern of field lines due to a solenoid carrying current . Why does a current carrying solenoid when suspended freely rests along particular direction Q14 Why is it necessary to balance a chemical reaction . Write the type of reaction & balanced chemical reaction when Lead Nitrate heated http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com Q15 A compound X on electrolysed in aqueous solution produces strong base Y along with two gases P and Q. Q is used in manufacturing of bleaching powder . Identify X,Y P and Q Write the name of the process and balanced chemical reaction Q16 Two students perform the experiment on series and parallel combination of two given resistance R1 and R2 shown in graph Which of this grph is correctly labeled in terms of the words “series” and “parallel” Justify your ans. (b) An electrical geyser has the rating 200W-220V marked on it. What should be the minimum rating in whole number of fuse wire that may be required of for safe use with their geyser Q17 (a) Two compounds of our daily use , table salt and sugar, on heating strongly in separate pans shows the melting of sugar only. Why ? Give reasons. (b) Write the proper method to dilute the conc. Sulphuric acid and reason behind that method Sec-C Q18 Explain (a ) What are environmental consequences of increasing demand for energy?What steps would you suggest to reduce energy consumption? (b) Why series arrangement is not prefer for domestic circuit (c) How resistance and Resistivity changes if length of wire is drawn to double by pulling (d)State the rule to determine the direction of magnetic field around a straight conductor carrying current Q19 Explain (a) A person observed a black coating on silver medal ,green coating on copper coins. Which phenonmenon is responsible for these coating Write the name of black and greem coating(b) Which one is blue in colour CuSO4 5H2O or CuSO4 © Which gas is collected in double amount when electrolysis of water why? (d) Write basic difference between calcinations and roasting Which one is used to get Zinc from calamine (write the reaction)(e) Why dry ammonia has no action on litmus paper but solution of ammonia solution in water turns red litmus paper blue MCQ Q.20 Four students were provided the test tube holders, test tubes and some chemical. The teacher asked them to take some quantity of chemical in the test tube in heat in correct way. The correct way of heating is shown in set up is: 1x9 = 9 5X2 = 10 http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com ABCI VR1R2Q.21 A student was given few drops of an unknown solution and a strip of pH paper. He/she places a drop of the given solution on the strip, the colour of the strip changes to red. the solution is (1) Alkaline (2) Neutral (3) Acidic (4) Nothing confirmed Q.22 The current I and voltage V graph for two given metallic wires having resistance R1 and R2 are shown in. (1) R1>R2 (2) R1Classes (BASE MAKER) IX – X CBSE (Maths /Science) S-20, Vivekanand Colony, Bhopal, Phone : 0755-2751377, 9893213700