Correct Answer: C. ii, and iii

Correct Answer: C. hygroscopy

Explanation

Hygroscopic substances are used to keep products dry or to remove water from an area. They are commonly used in desiccators Some common examples of hygroscopic substances include: Sodium chloride. Zinc chloride. Calcium chloride

Correct Answer: C. over

Explanation

(a) Factors that can affect the rate of diffusion are:

— Mass — Temperature — Density.

(b) Effects of surface tension are:

— needle gently placed on the surface of water floats

— water skaters are able to walk on the surface of water

— spilled mercury forms spherical droplets

— soap bubbles are spherical in shape.

Correct Answer: B. 1.0^oC

Explanation

Potential Energy = Heat Energy

mgh = Mc\(\Delta \theta = \frac{gh}{c} = \frac{10 \times 240}{4.20 \times 10^3}\)

= 1.0°C

Correct Answer: C) allowing price to fall towards equilibrium

Explanation

This Economics question is asking about how to get rid of a surplus in a commodity market. A surplus is when there is too much of a commodity available in the market. To eliminate it means to reduce the excess supply of the commodity.

There are different ways to eliminate a surplus in a commodity market, but the correct option is option C, which is allowing the price to fall towards equilibrium. Equilibrium is the point where the quantity supplied is equal to the quantity demanded. If there is a surplus, it means that the quantity supplied is more than the quantity demanded, so the price needs to fall to encourage buyers to purchase more and sellers to reduce their supply. This would eventually bring the market back to equilibrium.

Option A, which is increasing the quantity supplied, would only make the surplus worse. Option B, which is decreasing quantity demanded, would also not be effective as it would only reduce the demand for the commodity and may not necessarily solve the problem of excess supply. Option D, which is allowing the price to rise towards equilibrium, would be effective in eliminating a shortage, but not a surplus.

It is important to note that the elimination of a surplus may take some time and adjustments in the market. Allowing the price to fall towards equilibrium may not happen immediately, but over time, it would encourage buyers to purchase more and sellers to reduce their supply, thus reducing the surplus.

Understanding the concept of market equilibrium and the forces of supply and demand is key in solving problems related to surpluses and shortages in the market.

Correct Answer: D. (1, -4)

Explanation

Equate the equation of the curve and the line in order to find their point of intersection ie The values of y in both equations.

\(y + x = 1 \implies y = 1 - x\)

\(x^{2} + 2x - 3 = 1 - x\)

\(x^{2} + 2x + x - 3 - 1 = 0 \implies x^{2} + 3x - 4 = 0\)

\((x - 1)(x + 4) = 0\)

\(x = (1, -4)\)

Correct Answer: C. interest groups

Correct Answer: D. 2n - 1

Correct Answer: A. regressive tax