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    • 2 A poisonous, odourless gas

    • 5 A plant's pollen that causes air pollution

    • 6 Pollution created by natural sources

    • 7 An opening in the Earth's crust which throws hot gases, magma and ashes

    • 9 Humans that make the land, water and air dirty and harmful to living things

    • 10 Land, air and water that gets dirty and is harmful to living things naturally

    • 17 This makes windmills turn

    • 18 Energy created from the earth

  • Across

    • 1 Any kind of power

    • 3 Precipitation combined with sulphur dioxide

    • 4 Where nuclear energy is produced

    • 8 Something in air, water, land that makes it dirty

    • 10 Land, air and water that gets dirty and is harmful to living things

    • 11 The type of energy that comes from the sun

    • 12 Power or energy than can be released from the nucleus of an atom

    • 13 Coal, oil and gas

    • 14 Biological mass

    • 15 Lightning, batteries, light bulbs and plugs

    • 16 Clear liquid that is cold


Energy Crossword Puzzle Answers

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    • 2 carbon monoxide

    • 5 goldenrod weeds

    • 6 natural wastes

    • 7 volcanoes

    • 9 manmade

    • 10 natural pollution

    • 17 wind

    • 18 geothermal energy

  • Across

    • 1 energy

    • 3 acid rain

    • 4 nuclear power plants

    • 8 pollution

    • 11 solar

    • 12 nuclear energy

    • 13 fossil fuels

    • 14 biomass


TIME: 3-31/2 HOURS M.M: 80

General Instructions:

  1. The question paper comprises of two sections, A and B, you are to attempt both the sections.

  2. All the questions are compulsory.

  3. There is no overall choice. However internal choice has been provided in all the three questions of five marks category. Only one option in each question is to be attempted.

  4. All questions of section A and all questions of Section B are to attempted separately.

  5. Question numbers 1 to 4 in Section A are one mark question. These are to be answered in one word or one sentence.

  6. Question numbers 5 to 13 are two marks questions, to be answered in about 30 words.

  7. Question numbers 14 to 22 are three marks questions, to be answered in about 50 words.

  8. Question numbers 23 to 25 are five marks questions, to be answered in about 70 words.

  9. Question numbers 26 to 41 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you.


  1. Identify the compound which is oxidized in the following reaction:

H2S + Br2  2HBr + S

  1. Why are titanium and chromium classified as strategic element?

  2. Which has a higher resistance: a 50W lamp or 25W lamp bulb and how many times?

  3. A drop of litmus solution is added to each of the four solutions give below. State the colour of litmus solution observed in each.

Soap solution, Sodium bicarbonate solution, Acetic acid, Tomato juice

  1. Translate the following statements into chemical equations and then balance the equations:

    1. Aluminium metal replaces iron from ferric oxide. Fe2O3, giving aluminium oxide and iron.

    2. Barium chloride reacts with zinc sulphate to give zinc chloride and a precipitate of barium sulphate.

  2. What is the chemical name of washing soda? Name the three chief raw materials used for making washing soda.

  3. Write four characteristics used for selecting a suitable fuel.

  4. How many 176 resistors (in parallel) are required to carry 5A on a 220V line? Distinguish between the terms electrical resistance and resistivity of a conductor.

  5. What is solenoid? Draw field lines of the magnetic field through and around a current carrying solenoid. What does the magnetic field pattern inside the solenoid indicate?

  6. a) What is power?

b)In a house hold, 5 tube lights of 40W each are used for 5 hours and electric press of 500W for 4 hours everyday. Calculate the total electrical energy consumed by the tube lights and press in a month of 30 days.

  1. Given the following reaction

2Al + Fe2O3  2Fe + Al2O3 + Heat

Answer the following with reason.

    1. Name the oxidising agent.

    2. Name the reducing agent.

    3. Name the substance oxidised.

  1. A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospital?

    1. Show the formation of NaCl from sodium and chlorine atoms by the transfer of electrons.

    2. Why has sodium chloride, a high melting point?

    3. Name the anode and the cathode used in electrolytic refining of impure copper metal.

  2. What are the functions of

    1. Gibberellins

    2. Cytokinins

    3. Absorbic acid

  3. Define ‘nerve impulse’ which structure in a neuron helps to conduct a nerve impulse.

  4. State three advantages associated with using solar cells to produce electricity.

    1. State Ohm’s law.

    2. Draw the circuit diagram of Ohm’s law.

    3. What is the nature of graph in terms of relation between V and I.

  5. a. An electric bulb is rated as 50W, 220V. Calculate the energy consumed by the bulb in 20 minutes. Express your answer in commercial units of electricity.

b.Distinguish between Overloading and Short Circuiting in a domestic circuit.

c.Why is it essential to earth electrical appliances having metallic body?

  1. What are the environmental consequences of the increasing element for energy? What steps would you suggest to reduce energy consumption?

  2. Name the hormone that-

i. is produced by thyroid gland

ii. Prepares the body for action

iii. Controls the amount of sugar in blood

iv. Brings about changes in boys at puberty

v. Brings about changes in girls at puberty

21. Draw neat and labelled diagram of digestive system.

Write the functions of the following glands.

    1. Salivary gland

    2. Liver

    3. Pancreas


    1. Why should curd and sour substances not be kept in brass and copper vessels?

    2. Why does an aqueous solution of acid conduct electricity?

    3. Why plaster of Paris should be stored in a moisture proof container?

    4. What is efflorescence?

    5. Why is baking soda used as an antacid?


  1. State reasons for the following.

      1. Metals are good conductor of heat.

      2. Addition of some silver to pure gold for making ornaments.

      3. Inability of non – metals for displacing hydrogen from dilute sulphuric acid.

  1. Balance the following equations

      1. CaO + H2O  Ca(OH)2

      2. NaOH + H2SO4  Na2SO4 + H2O

24. a. Explain why i) solar cooker is painted black from inside.

ii) the solar cooker box is covered with a glass sheet.

iii)the plain mirror reflector is used in solar cooker.

b.Draw a neat and well labelled diagram of solar cooker



Absorption of light energy by mesophyll cells of leaf causes.

  1. Oxidation of chlorophyll

  1. Excitation of chlorophyll

  1. Reduction of chlorophyll

  1. Evolution of O2


Which of the following does not secrete any hormone?

  1. Testis

  1. Spleen

  1. Ovary

  1. Pancreas


Which part of sunlight is used in making solar cell?

  1. Infrared radiation

  1. Ultraviolet radiation

  1. Visible radiation

  1. All of these


Which one of the following reaction can be a non – redox reaction?

  1. Combination

  1. Decomposition

  1. Displacement

  1. Double displacement.


Which of the following metal does not react with dilute sulphuric acid to liberate H2 gas?

  1. Calcium

  1. Sodium

  1. Iron

  1. Silver


Sodium carbonate is not used as:

  1. Ingredient in antacids

  1. As a cleaning agent

  1. For removing permanent hardness of water

  1. For manufacturing of glass


Which one of the following compounds is not an ionic compound?

  1. Sodium chloride

  1. Calcium chloride

  1. Carbon tetrachloride

  1. Magnesium chloride


Which among the following reactions are endothermic in nature?

  1. Decomposition of lead nitrate

  1. Burning of methane

  1. Dilution of sulphuric acid

  1. Dissolution of ammonium chloride in water.

  1. i. and ii.

  1. ii. and iii.

  1. iii. and iv

  1. i. and iv


Seeds which are kept in the conical flask during the experiment that CO2 is released during respiration must be.

  1. Dry

  1. Wet

  1. Germinated

  1. Boiled


The end products of aerobic respiration are

  1. CO energy and hydrogen

  1. CO2 and water

  1. CO2, H2O and ATP

  1. ADP and CO­2


The correct set up of for studying the dependence of the current on the potential difference across a resistor is

  1. A

  1. B

  1. C

  1. D


The normal positions of the pointers of the two ammeters A1 and A2 and two voltmeters V1 and V2 available in the laboratory are shown below:

For an experiment to study the dependence of the current on the potential difference across a resistor, the student should select.

      1. Ammeter A1­ and voltmeter V1

      1. Ammeter A2 and voltmeter V2

      1. Ammeter A1­ and voltmeter V2

      1. Ammeter A2­ and voltmeter V2


The given circuit diagram shows the experiment arrangement of different circuit components for determination of equivalent resistance of two resistors connected in series. The components X, Y and Z shown in the circuit, respectively represent

  1. Rheostat, Resistor, Ammeter

  1. Ammeter, Voltmeter, Rheostat

  1. Voltmeter, Ammeter, Rheostat

  1. Rheostat, Ammeter, Voltmeter


In the experiment on finding the equivalent resistance of two resistors, connected in parallel, the voltmeter has been correctly connected in

  1. Circuit I only

  1. Circuit II only

  1. Both circuits I and III

  1. Both circuits II and IV


The three students (A), (B) and (C) connected their two given resistors R1 and R2 in the manner shown below.

They connect the terminals marked X and Y above to the terminals marked X and Y in the given circuit. They record the ammeter readings (I) for different positions of the rheostat and the corresponding voltmeter readings (V).

The average value of the ratio V/I in their observations would be minimum for:

  1. Students (A) and (B) only

  1. Students (B) and (C) only

  1. Students (C) and (A) only

  1. Student (A) only.

40. For testing the presence of starch an illuminated leaf is first

a) Boiled in alcohol b) Dipped in iodide solution

c) Boiled in water d) Placed in safranin solution

41. Solid sodium bi carbonate was placed on a strip of pH paper. The colour of the strip

a) Turned blue b) did not change

c) Turned green c) Turned light pink

42. The temporary mount of the leaf epidermal peel which looked pinkish red under the microscope was

a) Stained in acetocarmine and mounted in glycerine

b) Stained in iodine and mounted in water

c) Stained in safranin and mounted in glycerine

d) Stained in mythlene blue and mounted in water

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