# Solved papers for 10th Class Science Solved Paper - Science-2014

### done Solved Paper - Science-2014

• question_answer1) Name the two components of peripheral nervous system.

• question_answer2) A charge of 150 coulomb flows through a wire in one minute. Find the electric current flowing through it.

• question_answer3) What are hot spots inside earth's crust?

• question_answer4) Explain why, an aqueous solution of sodium sulphate is neutral while an aqueous solution of sodium carbonate is basic in nature.

• question_answer5) When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction.

• question_answer6) Why do herbivores have longer, small intestine than carnivores?

 State reason for the following: (i) Lemon is used for restoring the shine of tarnished copper vessels. (ii) A metal sulphide is converted into its oxide to extract the metal from the sulphide ore. (iii) Copper wires are used in electrical connections.

 Select (i) combination reaction, (ii) decomposition reaction and (iii) displacement reaction from the following chemical equations: (i) $ZnC{{O}_{3}}(s)\to ZnO(s)+C{{O}_{2}}(g)$ (ii) $Pb(s)+CuC{{l}_{2}}(aq)\to PbC{{l}_{2}}(aq)+Cu(s)$ (iii) $NaBr(aq)+AgN{{O}_{3}}(aq)\to AgBr(s)+NaN{{O}_{3}}(aq)$ (iv) ${{H}_{2}}(g)+C{{l}_{2}}(g)\to 2HCl(g)$ (v) $F{{e}_{2}}{{O}_{3}}+2Al\to A{{l}_{2}}{{O}_{3}}+2Fe$ (vi) $3{{H}_{2}}(g)+{{N}_{2}}(g)\to 2N{{H}_{3}}(g)$ (vii) $CaC{{O}_{3}}(s)\xrightarrow{Heat}CaO(s)+C{{O}_{2}}(g)$

 State reason for the following: (i) dry HCl gas does not change the colour of the dry blue litmus paper. (ii) alcohol and glucose also contain hydrogen, but do not conduct electricity. (iii) Cone. of ${{H}_{3}}{{O}^{+}}$ ion is affected when a solution of an acid is diluted.

 State the kind of chemical reactions in the following examples: (i) Digestion of food in stomach (ii) Combustion of coal in air (iii) Heating of limestone

• question_answer11) The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air from nostrils to the lungs in human beings.

• question_answer12) Mention three characteristic features of hormonal secretions in human beings.

 (a) State the purpose of formation of urine. (b) What will happen if there is no tubular reabsorption in the nephrons of kidney.

• question_answer14) A circuit has a line of 5 A. How many lamps of rating 40 W; 220 V can simultaneously run on this line safely?

• question_answer15) The resistance of a wire of 0.01 cm radius is $10\,\Omega$. If the resistivity of the material of the wire is $50\times {{10}^{-8}}\,ohm$ metre, find the length of the wire.

 Show four different ways in which four resistors of r ohm each may be connected in a circuit. In which case is the equivalent resistance of the combination. (i) maximum (ii) minimum

 Amit lives in Delhi and is much concerned about the increasing electricity bill of his house. He took some steps to save electricity and succeeded in doing so. (i) Mention any two steps that Amit might have taken to save electricity. (ii) Amit fulfilled his duty towards the environment by saving electricity. How? (iii) Which alternative source of energy would you suggest Amit to use?

• question_answer18) List any three qualities of an ideal source of energy.

 (a) Define corrosion. (b) What is corrosion of iron called? (c) How will you recognise the corrosion of silver? (d) Why corrosion of iron is a serious problem? (e) How can we prevent corrosion?

 Write balanced chemical equations for the following statements: (i) NaOH solution is heated with zinc granules. (ii) Excess of carbon dioxide gas is passed through lime water. (iii) Dilute sulphuric acid reacts with sodium carbonate. (iv) Egg shells are dropped in hydrochloric acid. (v) Copper (II) oxide reacts with dilute hydrochloric acid.

 (a) Write three main functions of the nervous system. (b) In the absence of muscle cells, how do plant cells show movement?

 (a) Draw magnetic field lines of a bar magnet. "Two magnetic field lines never intersect each other." Why? (b) An electric oven of 1.5 kW is operated in a domestic circuit (220 V) that has a current rating of 5 A. What result do you expect in this case?  Explain.

 What is meant by resistance of a conductor? Name and define its SI unit. List the factors on which the resistance of a conductor depends. How is the resistance of a wire affected if ? (i) its length is doubled, (ii) its radius is doubled?

 (i) Establish a relationship to determine the equivalent resistance R of a combination of three resistors having resistances ${{\mathbf{R}}_{\mathbf{1}}}\mathbf{,}\,{{\mathbf{R}}_{\mathbf{2}}}$ and ${{\mathbf{R}}_{\mathbf{3}}}$ connected in parallel. (ii) Three resistors are connected in an electrical circuit as shown. Calculate the resistance between A and B.

 Four students studied reactions of zinc and sodium carbonate with dilute hydrochloric acid and dilute sodium hydroxide solutions and presented their results as follows. The $(\uparrow )$ shows evolution of gas and $(-)$ shows no reaction. The right set is: (a) $Zn$ $N{{a}_{2}}C{{O}_{3}}$ HCl √ √ NaOH √ √ (b) $Zn$ $N{{a}_{2}}C{{O}_{3}}$ HCl - √ NaOH √ √ (c) $Zn$ $N{{a}_{2}}C{{O}_{3}}$ HCl √ √ NaOH √ - (d) $Zn$ $N{{a}_{2}}C{{O}_{3}}$ HCl √ - NaOH √ √

 Dilute NaOH solution and solid sodium carbonate: (a) react only on heating (b) react very slowly (c) do not react (d) react vigorously

 The colour of Cu metal is: (a) reddish brown (b) blue (c) green (d) grey

 Shashank was asked to carry out a displacement reaction which would show the following: (i) Formation of colourless solution (ii) Black deposits The reactants he should use are: (a) $Fe(s)$ and $A{{l}_{2}}{{(S{{O}_{4}})}_{3}}(aq)$ (b) $Al(s)$ and $FeS{{O}_{4}}(aq)$ (c) $Zn(s)$ and $CuS{{O}_{4}}(aq)$ (d) $Fe(s)$ and $ZnS{{O}_{4}}(aq)$

 Mrignayani was doing the experiment of comparing reactivity of metals in the laboratory. She was given aluminium metal and was told to check reactivity by using four solutions as shown below. She would observe that reaction takes place in: (A) (B) (C) (D) (a) A and B (b) B, C and D (c) A, C and D (d) C and D

 In an experiment to find the equivalent resistance of a series combination of two resistance of $3\,\Omega$ and $4\,\Omega$ in the circuit diagram given. The circuit will give: (a) Incorrect reading for current I and reading for voltage V (b) Incorrect readings for both current I and voltage V (c) Correct reading for current I and incorrect reading for voltage V (d) Correct readings for both voltage V and current

 A Student joined three resistances as shown in the circuit below. The current recorded by ammeter (A). (a) 0.25 A (b) 0.5 A (c) 0.75 A (d) 1 A

 The iodine solution is: (a) Pure iodine dissolved in water (b) Potassium iodide in water (c) Iodine dissolved in potassium iodide (d) Potassium iodide dissolved in iodide

 (A) (B) (C) (D) Choose the correct set up to demonstrate that $C{{O}_{2}}$ is given out during respiration: (a) A (b) B (c) C (d) D

• question_answer34) An iron nail is dipped in the solution of copper sulphate for about 30 minutes, state the change in colour observed. Give the reason for the change.

• question_answer35) A student while verifying Ohm's law calculated the value of resistance of the resistor for each set of observation.  However, the values of resistance were slightly different from the actual value. Is this experiment wrong? Justify your answer:

• question_answer36) Draw a labelled diagram of stomatal apparatus with closed stomatal pore.

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