Explanation

(a) Nitrogen distils over first before oxygen because nitrogen has lower boiling point and it is therefore more volatile than oxygen

(b) Fractional distillation of petroleum

Correct Answer: A. 106Hz

Explanation

\(\lambda\) = 4L

= 4 x 80 = 320cm

Converting 320cm to m, we have 3.2m

F = \(\frac{V}{\lambda}\)

= \(\frac{340}{3.2}\)

= 106.25Hz

\(\approxeq\) 106Hz

Correct Answer: B) insects

Explanation

Malpighian tubules are excretory organs that are responsible for removing waste materials from an organism's body. These tubules are found in different organisms including insects, flatworms, annelids, and jellyfish. In this question, you are asked to identify the group of organisms that have Malpighian tubules as their excretory organs. The correct answer is option B, which is insects. Insects are known to have Malpighian tubules that remove waste materials from their digestive system. Malpighian tubules in insects are highly efficient and can help regulate the insect's water balance. It is important to note that while Malpighian tubules are found in various organisms, they may differ in structure and function. For example, in annelids, the tubules are responsible for removing nitrogenous waste from the coelomic fluid. Overall, Malpighian tubules play an essential role in maintaining the internal environment of an organism by removing waste materials.

Correct Answer: A. Preference shareholder

Correct Answer: B. rule of law

Correct Answer: D. root hair.

Correct Answer: C. preliminary survey ? reconnaissance ? mapping

Correct Answer: D. registration

Correct Answer: B. ''who told you that you were naked?''

Explanation

Raina, the only daughter of Paul and Catherine Petkoff, is a very beautiful lady of about twenty-three years old. She appears in the play as a lively and articulate lady. But one who is also given to fantasizing about love and war. For example, she is attracted to Sergius precisely because she believes war is a theater for heroic exploits. Similarly, she is drawn to Bluntschil for about the same reason, he being a soldier. Raina is also very intelligent and brave; she allows Bluntschli, a total stranger into her room and shield him, a great personal risk, from being discovered by the search party. Her taking to Bluntschli partly reflects her intelligence and her capacity to argue, as well as accommodate opposing view.

Apart from being intelligent and brave; there is spontaneity in her nature that enables her to adapt more readily to changing situations. In that she is in sharp contrast with the more calculating Louka. Raina is also an attention-seeker. She knows how to make use of opportunities that project her in a positive light. When, for instance. Sergius returns from the war, she times her appearance to coincide with his asking after her. It is to Raina's credit that her character develops in the play. She is increasingly seen as one who is honest enough to recognize her mistaken ideals about war and love. She is able to come to terms with the mutual attraction between Sergius and Louka and this allows him to follow his hearts desire. In equal measure, she accepts the fact that her relationship with Sergius is based on social class, which excludes her own feelings, thus she is able to welcome Bluntschli's proposal of marriage.