CBSE Class 10 Science Question Paper 2006 (2)

CBSE Class 10 Science Question Paper 2006 (2). Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SCIENCE AND TECHNOLOGY (Theory)

SECTION – A

Q. 1. What is the purpose of quenching steel? 

Q. 2. What constitutes the field of a magnet? 

Q. 3. What is the advantage of the third wire of earth connection in domestic electric appliances? 

Q. 4. Name the process of large energy production in the Sun. 

Q. 5. What is efflorescence? Give an example. 

Q. 6. Draw a ray diagram to show the

       i. position and

       ii. nature of the image formed when an object is placed between focus F and pole P of a concave mirror.

Q. 7. Give one example of each and state the role of

       i. a moderator and

       ii. a coolant in a nuclear reactor. 

Or

Complete the following nuclear reaction equations:

       i. AI + He --------> Si + ………..

       ii. AI + H ---------> Si + …….......

Q. 8.

       i. If you observe the position of a star at a fixed time everyday, how many degrees higher will it appear after a month of            30 days?

       ii. Describe an activity to show that a star moves a certain angle in the sky relative to its position the previous day. 

Q. 9.

      i. An aqueous solution has a pH value of 7.0. Is this solution acidic, basic or neutral?

      ii. If H+ concentration of a solution is 1 x 10^-2 mol L^-1 what is the pH value for it?

      iii. Which has a higher pH value, 1 M HC1 or 1 M NaOH solution? 

Q. 10. Describe with a labelled diagram, the Froth Floatation Process used to separate the gangue from a Sulphide ore. 

Q. 11. Give reasons for the following:

      i. Metals are regarded as electro-positive elements.

      ii. When a piece of Copper metal is added to a solution of Zinc sulphate, no change takes place, but the blue colour of              Copper sulphate fades away when a piece of zinc is placed in its solution.

      iii. Articles made of Aluminium do not corrode even though aluminium is an active metal. 

Q. 12.

     i. What is the ‘fermentation process’?

     ii. Name the gas evolved during the fermentation process.

     iii. List the two products formed when the enzyme invertase acts on sugar present in molasses.

Q. 13. A 5.0 cm tall object is placed per pendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. By calculation determine (i) the position, and (ii) the size of the image formed.

Q. 14.

     i. Draw a schematic diagram of a circuit consisting of a battery of five 2 V cells, a 5 ohm resistor, a 10 ohm resistor and a         15 ohm resistor, and a plug key, all connected in series.

      ii. Calculate the electric current passing through the above circuit when the key is closed. 

Q. 15.

      i. Why is Sulphuric acid called the ‘king of chemicals’?

      ii. Name the gas evolved when:

      a. Concentrated Sulphuric acid acts on Sulphur.

      b. Dilute Sulphuric acid acts on Sodium carbonate.

      iii. State the colour change you would observe on adding concentrated Sulphuric acid to

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