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             C OMBUSTION AND F LAME Answer the following   Questions. 1.     What is Combustion? 2.     Name the petroleum product used for surfacing of roads. 3.     What is ignition temperature?    4.     Name the unit in which the calorific value of a fuel is expressed.   5.     What do you mean by fossil fuel? 6.     How coal is formed from dead vegetation. What is this process called ? 7.     What is Acid Rain? 8.     Where do we get coal from and how is it formed? 9.     Why fossil fuels are exhaustible natural resources? 10.                        What are the advantages of using CNG and LPG as fuel? 11.   ...

             M ATERIALS : M ETALS AND N ON- M ETALS DATA   BASED   ACTIVITY : Aim of the survey : To identify and classify the materials commonly used at home into metals and non-metals.    FORMATE OF THE REPORT 1)    Aim of the survey. 2)    Introduction with purpose. 3)    Methods used for survey. 4)    Information. 5)    Interpretation of data 6)    Conclusion. 7)    Reference.

                      S TARS AND S OLAR S YSTEM Give one word for the following : 1.      Ray of light striking a reflecting surface. 2.    Angle between incient ray and normal. 3.    Angle between reflected and normal. 4.    Objects that shine in the light of other objects. 5.    Objects which emit their own light. 6.    Splitting of white light into its colours. 7.    The small opening in the iris. 8.    Luminous objects in the sky. 9.    The dark muscular structure behind the cornea. 10.             The cells sensitive to bright light and colour.   11.             The cell sensitive to dim light. 12.    ...

                S TARS AND S OLAR S YSTEM v Observe the correlation between the words of the first pair and complete the second pair.                  I.             Stars: Seen because of their own light :: Planets:                        .               II.             Beautiful rings : Mars :: Long tail :                              .           III.   ...

               M ATERIALS : M ETALS AND N ON- M ETALS Match the substances given in Column A with their uses given in Column B.                     A                                       B   1            Gold a]     Thermometer   2            Iron b]     Electric wire   3        Aluminium c]     Wrapping Food   4       ...

                     LIGHT Select and write the most appropriate alternative [A,B,C,D] from those given below each statement . 1.     The angle of reflection is the angle between A] The incident ray and the normal B] The incident ray and the reflecting surface C] The incident ray and the reflected ray D] The reflected ray and the normal 2.     The angle between the incident ray and the reflected ray is 40°.Therefore the angle of incidence is A] 40°                                                                     ...

            C ROP   P RODUCTION   A ND   M ANAGEMENT Arrange the following boxes in proper order to make a flow chart of sugarcane crop production .                                                          [1]                                                            [2]    ...

                       C OAL   AND   P ETROLEUM Fill in the blanks ·       Natural gas is stored under high pressure as                        ·       Earlier, it was used in railway                           . ·                          Is also used as a fuel in various industries. ·       The slow process of conversion of dead vegetation into coal is called               ...

M ATERIALS : M ETALS AND N ON- M ETALS Distinguish between metals and non-metals on the basis of these properties. Properties           Metals        Non-Metals    Appearance    Hardness    Malleability    Ductility    Heat Conduction    Conduction of          Electricity

                   C OAL   AND   P ETROLEUM Tick TRUE/FALSE against the following statements. a)     Fossil fuel can be made in the laboratory.            [T/F] b)    Coal is not used in railway engines to produce steam to run the engine.             [T/F]       c)     Coal is also called as fossil fuel .              [T/f]   d)    Coke is not pure form of carbon .            [T/F]   e)    CNG is more polluting fuel than petrol.          [T/F]      f)      Coal gas is used for power generation .  ...