PS Lesson 1 - Diagnostic Test

What is the most accepted theory about the formation of the universe explaining that it continues to expand?

• Big bang theory

• Divine Creation Theory

• Oparin Theory

• Spontaneous Generation Theory

Answer explanation

The Big Bang Theory states that the universe may have begun as an infinitely hot and dense initial singularity, a point with all of space, time, matter and energy. This is only expanding or stretching upon itself.

Divine Creation Theory where a divine being created everything in the universe including all life forms and matter.

What is the first proposed structure of an atom by John Dalton in adaption of the concepts of early Greek philosophers like Democritus?

• Nuclear Model

• Solid Sphere Model

• Planetary Model

• Plum Pudding Model

Answer explanation

• John Dalton - Solid Sphere Model

• J.J. Thompson - Plum Pudding Model

• Ernest Rutherford - Nuclear Model

• Neils Bohr - Planetary Model

• Erwin Shrodinger - Quantum Model

What is the process of forming elements?

• electrogeneration

• genesis

• nucleosynthesis

• photosynthesis

Answer explanation

Other nuclei of new elements were formed through nucleosynthesis. Nucleosynthesis occurs mainly through the fusion of lighter elements or the fission or radioactive decay of heavier elements.

What is the lightest and most abundant elements in the universe?

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

Answer explanation

Hydrogen is the lightest and most abundant element in the universe.

Which of the following is the heaviest element among the given?

• Beryllium

• Helium

• Hydrogen

• Iron

Answer explanation

Atomic mass (A) is proportional to the atomic number (Z) in the periodic table of elements.

What do you call this whole statement: “Na + Cl → NaCl”

• Chemicals

• Chemical equation

• Chemical formula

• Chemical product

Answer explanation

Chemical Equation shows the proportion of the reactants and the product that they produce after the chemical reaction.

What is "NaCl" for sodium chloride?

• Chemicals

• Chemical equation

• Chemical formula

• Chemical product

Answer explanation

Chemical formula is the ratio of each elements in a compound.

Which of the following is a covalent compound?

• H2O

• MgO

• NaCl

• CuO

Answer explanation

ionic bonds form ionic compounds (Metal + Non-metal)

covalent bonds form covalent compounds (Non-metal + Non-metal)

What is the reaction of the combination of two or more nuclei?

• Nuclear Fission

• Nuclear Fusion

• Nuclear Explosion

• Nuclear Combustion

Answer explanation

fusion = combining

fission = splitting

What is the reaction of the splitting of two or more nuclei?

• Nuclear Fission

• Nuclear Fusion

• Nuclear Explosion

• Nuclear Combustion

Answer explanation

fusion = combining

fission = splitting