Correct Answer: D. Involvement in local politics

Explanation

A good Extension worker must have; organisational ability, clear judgement, initiative which qualities helps him to organize and interact with his target groups, but involvement in local politics is not a quality of a good extension worker.

Correct Answer: C. a D.C electric motor

Correct Answer: D. nucleus

Correct Answer: D) 2%

Explanation

To answer this question, we first need to determine the amount of KClO\(_3\) that can dissolve in 40.0 cm\(^3\) of water at 298K.

Given the solubility of KClO\(_3\) is 20.0 mol dm\(^{-3}\) at 298K, we can calculate the maximum amount of KClO\(_3\) that can dissolve in the given volume of water. To do this, we first convert the volume from cm\(^3\) to dm\(^3\):

\[\frac{40.0\, cm^3}{1000\, cm^3/dm^3} = 0.040\, dm^3\]

Next, we can find the moles of KClO\(_3\) that can dissolve in 0.040 dm\(^3\) of water:

\[(20.0\, mol\, dm^{-3})(0.040\, dm^3) = 0.8\, mol\]

Now, we can calculate the mass of dissolved KClO\(_3\) by using the given molar masses of K, Cl, and O:

\[0.8\, mol \times (39\, g/mol\, K + 35.5\, g/mol\, Cl + 3 \times 16\, g/mol\, O) = 72.0\, g\]

Since we initially had 100.0 g of KClO\(_3\), and 72.0 g dissolved, we can calculate the percentage of KClO\(_3\) left undisolved:

\[\frac{100.0\, g - 72.0\, g}{100.0\, g} \times 100\% = 28.0\%\]

However, the given answer is 2% which may be incorrect. Based on the calculations, the correct answer should be 28%. It is recommended to consult the relevant sections of the recommended textbooks for more information and clarification.

Correct Answer: C. second ballot

Correct Answer: A. 100Ns

Explanation

I = Ft = m(v - u)

= 5(50 - 30) = 100

Correct Answer: B. dignity of labour

Correct Answer: A. man

Explanation

a) Dielectric strength is the maximum potential gradient or electric field strength an insulator can withstand without breaking down. It is measured in Vmm\(^{-1}\) or Vm\(^{-1}\).

(b)(i) The wave is infra-red wave.

(ii) Suitable detector can be -Infra-red camera;

-Thermopile;

-Bolometer or

-Photographic film.

(iii) Source of the wave can be - Hot bodies or sun

(c) E = \(\frac{F}{q} = \frac{W}{q}\)

W =mF = Eq

= 1200 x 1.0 x 10\(^{-19}\)

= 1200 x 1.0 x 10\(^{-19}\)N

(d) X\(_L\) = 1.2\(\pi fL\)

= 2 x 3.142 x 50 x 0.50 = 15.7\(\Omega\)

X\(_c\) \(\frac{1}{2 \pi fL}\)

= \(\frac{1}{2 \times 3.14 \times 50 \times 25 \times 10^{-16}}\)

= 127.4 \(\Omega\)

(i) Z = \(\sqrt{R^2 + (X_1 - X_c)^2}\)

= \(\sqrt{100^2 + (127.4 - 15.7)^2}\)

= 149.9\(\Omega\)

(ii) I \(\frac{V}{Z} = \frac{220}{149.9}\)

= 1.47A

Correct Answer: A. Applet