TOEFL EXERCISE
Choose the letter of the word or group of words that best completes the sentence.
1.
sucked groundwater from below, some parts of the city have begun to sink as much as ten
inches annually.
(A) Pumps have
(B) As pumps have
(C) So pumps have
(D) With pumps
2. If ultraviolet radiation enters the Earth's atmosphere, generally blocked by the ozone
concentrated in the atmosphere.
(A) it
(B) it is
(C) so it is
(D) then it
3. Case studies are the target of much skepticism
Answer (4)
insoluble impurities donot raise the boiling point of a solution. it could be explained from raoults law that vapor pressure of the solution is affected by the partial vapour pressure of components in the solution. That is if the solute is not dissolved in a solution then how could it raise the boiling point. It wont affect its boiling point at all.
The boiling point of a liquid can be raised without adding a soluble impurity by increasing the external pressure. Higher pressure increases the boiling point of the liquid since it requires more energy (heat) for the liquid to change into vapor. ;
The boiling point of a liquid can be raised by increasing the pressure above it, which requires the vapor pressure to match this higher pressure before boiling occurs. Other methods include using controlled environments, such as autoclaves, to maintain a higher pressure. These techniques do not involve adding soluble impurities but rely on physical alterations of the conditions surrounding the liquid.
;
Jawaban:1. (B) As pumps have This option correctly establishes a causal relationship. The sinking of the city is a consequence of the pumps sucking groundwater. "As" introduces this cause-and-effect connection effectively. 2. (B) it is The sentence requires a passive construction because the ultraviolet radiation is acted upon, not the actor. "It is generally blocked" correctly shows that the ozone layer performs the action of blocking.
