(i) The question paper consists of two sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no overall choice. However, internal choice has been provided.
(iv) All questions of Section A and all questions of Section B are to be attempted separately.
(v) Questions number 1 to 4 in Section A and 17 to 18 in Section B are short answer type questions. These questions carry one mark each.
(vi) Questions number 5 to 8 in Section A and 19 to 20 in Section B are short answer type questions and carry two marks each.
(vii) Questions number 9 to 14 in Section A and 21 to 23 in Section B are also short answer type questions and carry three marks each.
(viii) Questions number 15 to 16 in section A and question number 24 in section B are long answer type questions and carry five marks each.
What is the purpose of quenching steel?VIEW SOLUTION
What constitutes the field of a magnet?VIEW SOLUTION
What is the advantage of the third wire of earth connection in domestic electric appliances?VIEW SOLUTION
Name the process of large energy production in the Sun.VIEW SOLUTION
What is efflorescence? Give an example.VIEW SOLUTION
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.VIEW SOLUTION
Give one example of each and state the role of
(i) a moderator and
(ii) a coolant in a nuclear reactor
Complete the following nuclear reaction equations:
(i) 13AI27 + 2He4 --------> 14Si30 + ………..
(ii) 13AI27 + 1H1 ---------> 14Si27 + …….......VIEW SOLUTION
(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.VIEW SOLUTION
(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?VIEW SOLUTION
Describe with a labelled diagram, the Froth Floatation Process used to separate the gangue from a Sulphide ore.
Name a major ore from which iron is extracted. Write chemical equations for the reactions that take place in the blast furnace for the extraction of iron from this ore.VIEW SOLUTION
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.VIEW SOLUTION
(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.
Complete the following equations and write the names of products formed
A 5.0 cm tall object is placed perpendicular 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.VIEW SOLUTION
(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.
(ii) When the key is closed, total voltage applied across the circuit will be = 2 × 5 V = 10 V
Total resistance (R) applied across the circuit in Ohms = 5 + 10 + 15 = 30 Ω
By Ohm’s law,
I 0.33 AVIEW SOLUTION
(i) Why Sulphuric acid is 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:
(a) Blue Copper sulphate crystals
(b) Colourless cane-sugar crystalsVIEW SOLUTION
(i) Distinguish between renewable and non-renewable sources of energy giving one example of each.
(ii) Why is the use of wood as a fuel not advised although forests can be replenished?
(i) Write the value of solar constant of Sun.
(ii) What type of mirror is used in Box Type Solar Cooker?
(iii) Why it is difficult to use hydrogen as a source of energy?
(iv) What is the maximum temperature attained in a concave reflector type solar cooker?
(v) Fossil fuels are classified as non-renewable source of energy. Explain why.VIEW SOLUTION
What is breathing?VIEW SOLUTION
Name the type of blood vessels which carry blood from organs to the heart.VIEW SOLUTION
What is meant by a biodegradable waste? Which of the following is/are biodegradable?
Agricultural residue, Plastics, Insecticides, SewageVIEW SOLUTION
Suggest any two ways to strike a balance between environment and development.VIEW SOLUTION
Draw the diagram of a palisade cell of a plant leaf and label the following in it:
(iv) NucleusVIEW SOLUTION
Describe the central nervous system in human beings under the following heads:
(i) Regions included
(ii) Three functions of any one regionVIEW SOLUTION
When is blood clotting useful? In a flow chart, illustrate the four major events involved in blood clotting.VIEW SOLUTION
(i) What is ‘genetics’?
(ii) Give the common name of the plant on which Mendel performed his experiments.
(iii) What for did Mendel use the term factors and what are these factors called now?
(iv) What are genes? Where are the genes located?
(i) Who provided the evidence of DNA as a genetic material?
(ii) Why is DNA called as polynucleotide?
(iii) List the three important features of double helical model of DNA.VIEW SOLUTION
Board Papers 2014, Board Paper Solutions 2014, Sample Papers for CBSE Board, CBSE Boards Previous Years Question Paper, Board Exam Solutions 2014, Board Exams Solutions Maths, Board Exams Solutions English, Board Exams Solutions Hindi, Board Exams Solutions Physics, Board Exams Solutions Chemistry, Board Exams Solutions Biology, Board Exams Solutions Economics, Board Exams Solutions Business Studies, Maths Board Papers Solutions, Science Board Paper Solutions, Economics Board Paper Solutions, English Board Papers Solutions, Physics Board Paper Solutions, Chemistry Board Paper Solutions, Hindi Board Paper Solutions, Political Science Board Paper Solutions, Answers of Previous Year Board Papers, Delhi Board Paper Solutions, All India Board Papers Solutions, Abroad/Foreign Board Paper Solutions, cbse class 12 board papers, Cbse board papers with solutions, CBSE solved Board Papers, ssc board papers.