Correct Answer: D. Hydraulic system

Explanation

The hydraulic system of a tractor is responsible for providing power to the attached implements or machinery. It uses a fluid under pressure to transmit power from the tractor to the implements for various functions. The engine is the power source of the tractor, but it is the hydraulic system that transmits this power to the implements.

Correct Answer: D. (13, 157.38°)

Explanation

\(p = (5i - 12j); |p| = \sqrt{5^{2} + (-12)^{2}}\)

= \(\sqrt{169} = 13\)

\(\tan\theta = \frac{-12}{5} = -2.4 \implies \theta = -67.38°\)

Direction = \(90° - (-67.38°) = 157.38°\)

Correct Answer: A) Concentrated tetraoxosulphate (VI) acid

Correct Answer: B. \(3^{\frac{1}{2}}\)

Explanation

\(\log_{3} x = \log_{9} 3 \implies \log_{3} x = \log_{9} 9^{\frac{1}{2}} = \frac{1}{2}\log_{9} 9\)

\(\log_{3} x = \frac{1}{2} \)

\(\therefore x = 3^{\frac{1}{2}}\)

Explanation

Factors that determine the price elasticity of demand for a commodity are:

(i)The consumer's income:The higher the consumers income, the more inelastic his demand for goods and services will tend to be.

(ii) Substitutes:Commodities which have close substitutes tend to have a high price elasticity of demand while those that do not have close substitutes are likely to be inelastic.

(iii) Nature of commodity: Whether the commodity is a necessary or a luxury good will affect the elasticity of demand. Any good that is considered necessary will always be demanded even if the price is increased, i.e, the good is inelastic in demand. Luxury goods on the other hand are highly elastic in demand.

(iv) One's habit:When one forms a habit on the consumption of a commodity a change in the price of that commodity will not affect one's demand for such commodity.

Correct Answer: B. a nation state

Explanation

nation-state. is a form of political organization under which a relatively homogeneous people inhabits a sovereign state especially : a state containing one as opposed to several nationalities.

Correct Answer: C. Loamy soil

Explanation

Loamy soil; this is the best soil for planting, because it contains all types of soil in the right proportion and required nutrients for growth of plant.

Correct Answer: D. will produce effervescence with magnesium ribbon

Correct Answer: C. clay → silt → sand → gravel

Correct Answer: A. polarization.

Explanation

Polarization:The hydrogen bubbles which are clinging over the surface of copper electrode anode becomes a thin film of hydrogen over the copper electrode. This hydrogen film increases the internal resistance and reduces the emf of the cell and hence the cell soon becomes inactive. This effect is known as polarization