AND THE MINISCULE AMOUNT THAT IS LEFT DOESN’T PROVIDE A RELIABLE M...

14, and the miniscule amount that is left doesn’t provide a reliable measurement of age. In

the case of older objects, other age-dating methods are available, methods which use

radioactive atoms with longer half-lives than carbon has.

Question 43:

This passage is mainly about ______.

A.

archeology and the study of ancient artifacts

B.

one method of dating old objects

C.

various uses for carbon

D.

the differences between carbon-14 and nitrogen-14

Question 44:

Which of the following is NOT true about carbon-14?

A.

It and nitrogen always exist in equal amounts in any substance.

B.

Its half-life is more than 5,000 years.

C.

It can decay into nitrogen-14.

D.

It is radioactive.

Question 45:

The word

“it”

in paragraph I refers to________.

A.

carbon dating

B.

the age

C.

any organic natural material

D.

archeology

Question 46:

The word

“underlying”

in paragraph I could best be replaced by _______.

A.

below

B.

requiring

C.

serving as a basis for

D.

being studied through

Question 47:

The word

“roughly”

in paragraph 2 is closest in meaning to________.

A.

precisely

B.

harshly

C.

approximately

D.

coarsely

Question 48:

The paragraph following the passage most probably discusses_____.

A.

what substances are part of all living things

B.

how carbon-14 decay intonitrogen-14

C.

why carbon-14 has such a long half-life

D.

various other age-dating methods

Question 49:

It is implied in the passage that

.

A.

carbon dating has no known uses outside of archeology

B.

fossils cannot be age-dated using carbon-14

C.

carbon dating could not be used on an item containing nitrogen

D.

carbon-14 does not have the longest known half-life

Question 50:

It can be inferred from the passage that if an item contains more carbon-14

than nitrogen-14, then the item is _______.

A.

not as much as 5,570 years old

B.

too old to be age-dated with carbon-14

C.

too radioactive to be used by archeologists

D.

more than 5.570 years old