Question 1

How many atoms are in 9g of H2O?

Options :

A : 3.01 × 1023

B : 6.02 × 1023

C : 12.04 × 1023

D : 3.01 × 1013N

Answer: A

Question 2

In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly

affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments

than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of

water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO

concentration and distribution. An experiment was done to study the effect of different salinity levels on DO

in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt)

and is the content of dissolved salt in water.

CLEP-Science-and-Mathematics-page205-image13

The results of the experiment suggest that at salinities of greater than 30 ppt, it is likely that

Options :

A : dissolved oxygen levels would increase

B : water temperature would increase

C :

aquatic organisms would begin to die

D : there would be no change in dissolved oxygen

E :

the amount of dissolved oxygen would decrease

Answer: A

Question 3

The volume in liters of a 0.2M solution of NaOH needed to neutralize 2 liters of a 0.03M solution of HCl is

Options :

A : 0.3 L

B : 0.03 L

C : 0.1 L

D : 0.01 L

E : 0.2 L

Answer: A

Question 4

If an electron jumps from higher energy shell of energy E2 to lower energy shell E1, what will be the

wavelength of the photon emitted during the process?

Options :

A :

h (c/E1 − E2)

B : h (c/E1 × E2)

C : h (c/E1+ E2)

D : h (c/E2)

E : h (c/E2 − E1)

Answer: A

Question 5

Which of the following phenomena is NOT caused by the movement of the plates on the earth’s upper
mantle?

Options :

A : Earthquakes

B : Volcanic activity

C : Production of new crust along with destruction of old crust

D : Erosion

E : Formation of mountains

Answer: D

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