Correct Answer: D. 36.0 kg

Correct Answer: A. it is the nearest government to the people

Correct Answer: B. Seasonal changes

Correct Answer: D. HI

Correct Answer: C. 13.1

Explanation

Another word for mean is average. To find the average of this set of numbers, add them up, then divide by the amount of numbers in the set. In this case there are 9 numbers in the set, meaning we will divide our answer by 9. (12+5+7+15+21+17+16+13+12)/9= 118/9=13.1

Explanation

(a) This was a form of direct rule of British annexed territories in which the British established political institutions such as the executive council, legislative council and Governor which were used in ruling the people who were regarded as British subjects. The crown colony system was headed by the Governor.

(b)(i) The legislative councils were dominated by the British in the 1920s.

(ii) The Governors were virtually colonial dictators as they had veto powers.

(iii) Executive councils were mere advisory bodies to the Governors.

(iv) The use of traditional rulers as unofficial members in the legislative councils.

(v) The Governors had casting votes which were used to promote British colonial policies.

(vi) The executive councils consisted of only British officials up to 1940s.

(vii) The educated elite were excluded from the administration of the crown colony.

(viii) Africans who were members of the legislative councils were nominated instead of elected.

Correct Answer: A. ion

Explanation

(a)

A mass of dry air is entrapped in a uniform capillary tube, sealed at one end, by means of a mercury pellet. Both the tube and thermometer are then firmly attached a half-meter rule and placed in a water bath as shown above. The water is stirred and its temperature \(\theta_{1}\) at a steady state is noted. The corresponding length, \(L_{1}\) of the entrapped air is also noted and recorded. The water is gradually heated and stirred uniformly until another steady temperature, \(\theta_{2}\) is attained and recorded. The corresponding length, \(L_{2}\) of the air column in the capillary tube is again read and recorded. The experiment is repeated to obtain more sets of readings. A graph of L against \(\theta\) is plotted as shown.

Deduction: Since the volume V of the tube is proportional to its length, L the graph shows that the volume of the entrapped air increases (directly) with increase in temperature at constant pressure.

Precautions: Dry air must be used. Also, error of parallax in reading thermometer and meter rule avoided.

(b) \(S = \frac{V_{1} - V_{0}}{V_{0} \theta}\)

= \(\frac{18.7 - 13.7}{13.7 \times 100}\)

= \(\frac{5}{1370}\)

= \(3.65 \times 10^{-3} K^{-1}\)

(c) As temperature increases the kinetic energies the molecules increase and they bombard the wall the container at a faster rate since their velocities has increased. To keep the rate of change of momentum per unit area (i.e pressure) the same, the molecules will have to travel longer distances betweon collision This implies increase in volume.

Correct Answer: A) amphibian

Explanation

This Biology question is asking which type of vertebrate undergoes external fertilization. External fertilization is when fertilization (the fusion of an egg and sperm cell) occurs outside of the body. The options are amphibians, reptiles, birds, mammals, or both birds and mammals. The correct answer is Option A, amphibians. Amphibians are a type of vertebrate that typically lay their eggs in water or moist environments. The male releases sperm onto the eggs, and fertilization occurs externally. Reptiles, birds, and mammals all have internal fertilization, which means that fertilization occurs inside the female's body. Reptiles and birds lay shelled eggs that are fertilized internally, while mammals give birth to live young that have already been fertilized internally. It's important to note that there may be some exceptions to these generalizations, but in most cases, amphibians are the only vertebrates that undergo external fertilization. In summary, the correct answer to this Biology question is Option A, amphibians, as they are the only type of vertebrate that undergoes external fertilization.

Correct Answer: C. 9

Explanation

\(y \propto \frac{1}{x^2}\)

\(y = \frac{k}{x^2}\)

\(4 = \frac{k}{3^2}\)

\(k = 4 \times 3^2 = 36\)

\(y = \frac{36}{x^2}\)

When x = 2,

\(y = \frac{36}{2^2} = 9\)