ENNYSTON SCIENCE COMPETITION: 2ND ROUND - SENIOR 1

Which of these is an ion?

                                   

• (a) H⁺  

• (b) SO₄^2-   

• (c) HCl  

•     (d) Fe

  The  relationship  between  a  herbivore  and  the  bacteria  which  live  in    their  caecum  is   known  as         

• (a)  parasitism

• (b)  commensalism

• (c)  symbiosis

• (d)  saprophytism

An element has its number of electron to be 11 and its neutron to be 12. What is the mass number of the element?                                                 

• (a) 22

• (b) 24  

• (c) 21

• (d) 23.

The bond between two iodine molecules is

            

  

• a. coordinate covalent bond

• b. electrovalent bond 

• c. ionic bond  

•   d. van der waals forces

Kelvin temperature can be converted into celsius temperature by which of the following formula? 

• a. ^oC = K – 273

•   b. K + 273

• c. ^oC + 273/K 

•   d. K + 273/^oC

10. Water molecules are held together by

                          

• a. covalent bond

• b. hydrogen bond

• c. ionic bond

• d. van der waals forces.

     The  vector  of  the  malaria  parasite  is   the     

• (a) male culex

• (b) female   culex

• (c)  male  anopheles

• (d)  female  anopheles

    The  use  of   predators  to  control  pests  in   the   farm  is  known   as     

• (a)  predator  control

• (b)  animal  control

• (c)  parasitic   control

• (d)  biological   control

   Which  of  the  following  process  will  not   introduce  carbondioxide   into  the  atmosphere  ?

• (a)  photosynthesis

• (b)  respiration

• (c)  combustion

• (d)  putrefaction

Which  of  the   following   fixes   atmospheric   nitrogen  ?     

• (a)  Rhizobium

•  (b)  Nitrosomonas

• (c)  Nitrobacter

• (d)  Denitrifying  bacteria