CBSE sample paper16 class X science 2007

http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com Sample Paper – 2007 Class – X Science Time Allowed: 2 1/2 Hrs Max marks: 60 ----------------------------------------------------------------------------------------------------------------------General Instruction : 1. The question paper consists of two sections A and B. You are to attempt both the sections and all questions are compulsory. 2. The candidates are advised to attempt all the questions of section A separately and section B separately. 3. Marks allocated to every question are indicated against it. 4. Question no. 1-4 in section A and 17 and 18 in section B are to be answered in one word or one sentence. 5. Question no: 5-8 in section A and 19 and 20 in section B are to be answered in 30-40 words each. 6. Question no: 9-14 in section A and 21-23 in section B are to be answered in 40 to 50 words each. 7. Question no: 15 and 16 in section A and 24 in section B are to be answered in 70 words each. Section A 1) Why does molarity of solution change with change in temperature? 1 2) Write one features of enzymatic catalysts? 1 3) What is a closed system? 1 4) Define auto catalyst? 5) What is the formula of crystalline sodium carbonate ? 1 6) Define cullet? 1 7) Name the mirror which always forms a virtual image ? 1 8) Write a condition necessary for current flow. 1 9) Prove that for a concave mirror the radius of curvature is twice its focal length. 2 10) How is the colour of the star related to its temperature, explain. 2 11) What is Electromagnet? What type of core should put inside a current Carrying solenoid to make an electromagnet. State any 2 factors on which the strength of Electromagnet depends .2 12) Define the following : (i) Launch vehicle, (ii) Polar orbits, (iii) Geostationary orbit. 3 13) Define Dip and Declination . How are they related to the horzontal field of earth? 3 14) How will you distinguish between ethanol and propanone by suitable chemical test ? Give chemical reaction involved it ? 3 15) (a) How is Pyrex glass prepared? (b) What is the unique property in photo chromatic glass? (c) What is the major disadvantage of using the soda glass? (d) How colored glasses prepared? (e) Which type of glass is used in the glassware? What is its unique property which enable it to be used in glassware? http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com OR (i) Give the principle for the processes of liquation and hydraulic washing. (ii)Why is it necessary to convert metal sulphides and carbonates to oxides? (iii)What are the two important conditions that causes rusting? (iv) Draw diagrams to show the experimental set up that can prove the conditions under which rusting can occur. (5M) 16) State Ohm's law. When two resistors R1 and R2 connected in parallel to a source of energy, find the equivalent resistance. In the circuit given below if R1 R2 and R3 have 15  , 30 and 45 . respectively and the battery has 15 volt. Calculate (i) the equivalent resistance. (ii) current drawn from battery, (iii) the current through each resistor, 5 OR (i) What is nuclear chain reaction ? (ii) Complete the equation – 9Be 4 + 4 He 2 → ----------+ 1 n 0 (iii) Draw the diagram of the boiler type of nuclear reactor and label the parts. SECTION B 17. How does diaphragm help in inspiration? 1 18. Name the excretory organ of prawn and tapeworm. 1 19. Who proposed the biogenetic law? What does these laws states? 2 20. a) According to Darwin theory how a new species can be generates? b) What is incinerator? 3 21. What is Dialysis ? Explain with diagram. 3 22. How are spores formed in RHIZOPUS? 3 23. Differentiate between biodegradable and non-biodegradable pollutants. 3 24. Explain the CNS ,PNS and ANS in human being ? Or Define – 1) Ganglion 2) synapse 3) parthenocarpy 4) BMR 5)ABA (5M) BEST OF LUCK