Correct Answer: D) central nervous system

Explanation

The question is asking about the organs that make up the nervous system. The nervous system is responsible for communication throughout the body, and it is made up of the brain, spinal cord, and nerves. The brain is responsible for processing information and controlling body functions, while the spinal cord is responsible for transmitting information between the brain and the rest of the body. The question presents four options to choose from, which are: automatic nervous system, sympathetic nervous system, somatic nervous system, and central nervous system. The correct option is option D, which is central nervous system. The central nervous system is made up of the brain and spinal cord, and it is responsible for processing and coordinating information throughout the body. It is important to note that the autonomic nervous system and the somatic nervous system are two other divisions of the nervous system that work alongside the central nervous system. The autonomic nervous system controls involuntary actions such as heart rate and digestion, while the somatic nervous system controls voluntary actions such as movement of muscles. The sympathetic nervous system is a part of the autonomic nervous system that is responsible for the body's fight or flight response to stress. In summary, the brain and spinal cord make up the central nervous system, which is responsible for processing and coordinating information throughout the body. The autonomic and somatic nervous systems are other divisions of the nervous system that work alongside the central nervous system to control involuntary and voluntary actions, respectively.

Correct Answer: C. profit and loss account

Explanation

(a)i. 2KOH\(_{aq}\) + H\(_{2}\)SO\(_{4(aq)}\) \(\implies\) K\(_{2}\)SO\(_{4(aq)}\) + 2H\(_{2}\)O\(_{(l)}\)

ii. Amount of KOH used = \(\frac{24}{1000} \times \frac{0.150}{1}\) = 0.0036mol

Mole ratio of acid to base = 1:2

Amount of H\(_{2}\)SO\(_{4}\) used \(\frac{0.0036}{2}\) = 0.0018mol

\(\therefore\) Concentration of H\(_{2}\)SO\(_{4}\) = \(\frac{0.0018}{0.025}\) = 0.072mol dm\(^{-3}\)

(b)(i) Molar mass Mg(NO\(_{3}\))\(_{2}\) = 24 x 1 + 2 x [14 + (16 x 3)] 24 x 1 + 2 x [14 + 48] = 24 + 28 + 96 = 148 gmol\(^{-1}\)

Mass of N\(_{2}\) = 14 x 2- 28

\(\therefore\) %Nitrogen = \(\frac{28}{149} \times \frac{100}{1}\) = 18.9%

(c)i. Reaction with brominei n CCl\(_{4}\)/bromine water/H\(^{+}\) / K MnO\(_{4}\)/ H\(^{+}\) / K\(_{2}\)Cr\(_{2}\)O\(_{7}\)

- Reaction with aqueous NaHCO\(_{3}\)/ Na\(_{2}\)CO\(_{3}\). OR

- Reaction with alkanol + Conc. H\(+{2}\)SO\(_{4}\)

(ii) - Compound will decolourize bromine in CCl\(_{4}\)/ bromine water

- Change H\(^{+}\)/K\\(_{2}\)Cr\(_{2}\)O\(_{7}\) from orange to green.

- Change H\(^{+}\) /KMnO\(_{4}\) from purple to colourless.

- There will be effervescence/evolution of gas in reaction with NaCO\(_{3(aq)}\) / Production of sweet-smelling/fruity odour

(d) Add sufficient water to dissolve the pellets of NaOH. The solution is then added to the vegetable oil, stirred, and boiled. It is cooled to precipitate the soap/salt out the soap/salt. Filter off the soap takes off the soap crust.

(e) Define the Term Electronegativity: The tendency of an atom to pull to itself the shared pair of electrons in a covalent bond. The ability of an atom to attract shared electrons between It and another atom in a chemical bond

Explanation

(a)(i) Reactance is the opposition to the flow of a.c offered by a capacitor or an inductor or both.

(ii) Impedance is the overall opposition of a mixed circuit containing a resistor, an inductor and/or a capacitor.

(b) (i) Emf is induced because the coil rotates at a steady speed about a fixed axis in the magnetic field of the elctromagnet, it cuts through the magnetic lines of force.

(ii) The direction of current is reversed in each half of the rotation of the coil.

(iii) The law used to determine the direction of the induced current is Lenz's law. It states that the direction of the induced current is such as to oppose the change producing it.

(iv) The induced e.m.f can be increased by any two of the following: increased speed of rotation, efficient core design, increased number of turns in the coil and increased area of coil.

(c) E = Power x Time

= 6 x 5 x 60

=1800J

Correct Answer: B. rent

Correct Answer: C) Resin

Explanation

The question is asking which of the following is a plant excretory product. The options are oil, cytokinin, resin, amino acids, and gibberellins. Excretory products are waste substances that are produced by living organisms and then eliminated from the body. In plants, these waste substances are eliminated through a process called exudation. Oil, cytokinin, amino acids, and gibberellins are not excretory products of plants. Oil is produced by plants as a storage material for energy. Cytokinin and gibberellins are plant hormones that regulate growth and development. Amino acids are building blocks for proteins and are used in various metabolic processes. On the other hand, resin is a plant excretory product. Resin is a sticky substance that is produced by certain plants as a defense mechanism against insects and other predators. Resin can also act as a sealant to protect wounds in the plant. Therefore, the correct answer to this question is option C: Resin. It is important for students to understand the different waste products produced by plants and how they are eliminated from the body. This knowledge can help in understanding plant physiology and ecology.

Correct Answer: B. only White officials

Correct Answer: B. refused to listen to him

Correct Answer: A. Skeptical

Correct Answer: C. better storage facilities could be provided

Explanation

Post-harvest losses are losses that occur during transportation, storage, and processing of farm produce. They include on-farm losses, such as when grain is threshed, winnowed, and dried, as well as losses along the chain during. It can be controlled and reduced when good storage facilities are put in place to store harvested produce.