science quiz FOR SSS 1

1.    The number of particles in a mole of any element is _________.

• a.       60.23 x 10²³

• a.       6.02 x 10²³

• a.       6.023 x 10²⁴

• 6.02 x 10²⁵

1.       What is the relative molecular mass of MgSO₄. [Mg = 24, S = 32, O = 16].

•      100

• 120

• 220

• 72

The symbol for potassium is _____.

• P

• K

• S

• N

1.       These are the basic particles from which matter could be made except ___________.

• SALT

• ATOM

• ION

• MOLECULES

1.       Modern standard element with which chemists define relative atomic mass is ______.

• ¹²C

• ¹³C

• ³H

• ¹⁴C

  The type of association in which an organism kills and feeds directly on another organism is called ------------.

• Competition

• Parasitism

• Tolerance

• Contains Avogadro’s number of atoms.

Which of these organisms converts ammonia to nitrite?

• Nitrosomonas

• Nitrobacter

• Azotobacter

• Denitrifying bacteria

The removal of metabolic waste from the body is termed  -----------.

• Respiration

• Adaptation

• Excretion

• Nutrition

Trypanosomiasis is associated with  ---------.

    

• Cockroach

• Mosquito

• Housefly

• Tse-tse fly

Parasitism can best be defined as an association between two organisms in which   

• Both organisms benefits

• One of the organisms gains and the others neither gain nor loses 

• Both organisms suffer some disadvantages 

• One organism gain and the other loses.