Saturday 18 May 2013

Chemistry test chapter 15+16 (answer key)


1.d

2.c

3.d

4.b

5.c

6.d

7.d

8.a

9.c

10.d

11.c

12.d

13.a

14.c

15.c

16.c

17.d

18.b

19.b

20.d

Chemistry test Chapter 15+16 Book 2


1.     Which of the following is requirement of fertilizer
a)     It should be deliquescent
b)    It should be cheap to manufacture
c)     It should be stable in soil
d)    All


2.     In nitrogen fertilizer, nitrogen is the
a)     Main constituent of protein
b)    Impart green color to plants
c)     Both a and b
d)    None of these


3.     Different oxides of Si, Ca and Al combine together in burning zone gives
a)     Calcium aluminate
b)    Calcium ferrate
c)     Calcium silicate
d)    All


4.     In bleaching process, the pulp is dried by
a)     Steam
b)    Hot air
c)     Heating
d)    All


5.     Which of the following is incorrect statement about nitrogen importance
a)     It enhances plants growth
b)    It is involved in the synthesis of protein and nucleic acids
c)     It accelerates fruits and flowers growth
d)    It is involved in the chlorophyll synthesis


6.     Calcarious material include
a)     Lime stone
b)    Marble
c)     Chalk
d)    All of these


7.     The potassium present in plant, help the plant to
a)     Form starch, sugar and fibrous material
b)    Ripen the seeds and fruits
c)     Increases the resistant against disease
d)    All of above are correct


8.     Which of the following statement is incorrect about urea
a)     It is a synthetic fertilizer
b)    It is a natural fertilizer
c)     It provides micronutrients to the plants
d)    It is an inorganic water soluble compound


9.     What is clinker
a)     Roasted calcareous material
b)    Roasted argillaceous material
c)     Roasted calcareous and argillaceous material
d)    Roasted gypsum


10.                        Which of the following raw material is not present in the cement
a)     Lime stone
b)    Gypsum
c)     Blast furnace
d)    Red lead


11.                        Which sequence of steps is correct for the manufactures of cement
a)     Crushing, heating, mixing, grinding
b)    Crushing, mixing, heating, grinding
c)     Crushing, grinding, mixing, heating
d)    Mixing, heating, grinding, crushing


12.                        The sequence of zone in the rotary kiln are as
a)     Dry zone, burning zone, decomposition zone, cooling zone
b)    Cooling zone, burning zone, decomposition zone, dry zone
c)     burning zone, Cooling zone, decomposition zone
d)    Dry zone, decomposition zone, burning zone, cooling zone


13.                        The composition of mixture of clay and lime stone in the raw material is
a)     75% lime stone and 25% clay
b)    25% lime stone and 75% clay
c)     15% lime stone and 55% clay
d)    55% lime stone and 15% clay


14.                        The important function of burning zone in the rotary kiln is
a)     To dry the moisture of slurry
b)    Decompose lime stone to unslaked lime
c)     Combination of different oxides like CaO, SiO2, Fe2O3 and Al2O3
d)    To reduce the impurities


15.                        The percentage of nitrogen in ammonia is
a)     80%
b)    92%
c)     82.35%
d)    50%


16.                        Which is the chemical formula of calcium super phosphate
a)     CaH2PO4
b)    CaHPO4
c)     Ca(H2PO4)
d)    None of these


17.                        The elements like calcium, nitrogen and phosphorous added into the soil in large amounts are called
a)     Basic elements
b)    Trace elements
c)     Additives
d)    Nutrient elements


18.                        Surfactants are organic compounds, used in detergents which reduced the
a)     Viscosity of water
b)    Surface tension of water
c)     Boiling point of water
d)    Wetting ability of water


19.                        In NWFP, the phosphate fertilizer are produced at
a)     D.I Khan
b)    Haripur
c)     Nowshera
d)    Dargai


20.                        Ammonia gas used directly as a fertilizer injected into the soil at a depth of about
a)     Two inches
b)    Three inches
c)     Five inches
d)    Six inches