Correct Answer: Cousin

Solution : First, we need to draw a family tree.

Now, we clearly see that man's wife's sister-in-law is his wife's brother's wife because the man is the only child of his parents.

So, the man's son is the cousin of that boy.

Hence, the second option is correct.

Correct Answer: Marginal utility decreases as consumption increases

Solution : The correct answer is (c) Marginal utility decreases as consumption increases.

According to this law, as a consumer increases the consumption of a particular good or service while keeping the consumption of other goods constant, the additional utility or satisfaction derived from each additional unit of the good will diminish. In other words, the marginal utility of a good tends to decrease as more of it is consumed. This implies that each additional unit of a good provides less additional satisfaction than the previous unit, leading to a downward-sloping marginal utility curve.

Correct Answer: National Commission for SC and ST

Solution : The correct option is the National Commission for SC and ST.

The National Commission for Scheduled Castes and Scheduled Tribes (officially named the National Commission for Scheduled Castes) was established to address the social, economic, cultural, and educational concerns of India's Scheduled Castes and Scheduled Tribes.

Correct Answer: Municipal

Solution : The correct choice is the fourth option.

The incorrectly spelt word in the given sentence is municipial.

The correct spelling is municipal. It relates to a municipality, which is a local administrative division or governing body within a larger region, such as a city or town.

The meanings of the other options is as follows:

• A hospital is a medical facility or institution where individuals receive medical treatment, care, and sometimes surgery when they are ill or injured. 
• Government refers to the system or group of individuals and institutions that hold authority to govern and administer a country or region.
• A country is a distinct geographical area or region that is identified as an independent political entity with its own government, borders, sovereignty, and often a unique culture or identity.

Therefore, the correct sentence is: "The government is bringing a new law where every municipal will have its own hospitals across the country."

Correct Answer: Only C correct

Solution : According to the law of demand, if all other factors remain constant (cetris peribus), the price and quantity demand of any good or service are inversely related. When the price of a product rises, so does the demand for the same product.
Hence substitute prices should not change.

Correct Answer: Pascal's law

Solution : The correct option is Pascal's law.

The external static pressure given to a confined liquid "is distributed or transmitted evenly throughout the liquid in all directions," as stated by Pascal's law.

According to Blaise Pascal, a pressure change at any point in a confined, incompressible fluid is transmitted throughout the fluid, so that change occurs everywhere. This principle is known as Pascal's law, Pascal's principle, or the principle of transmission of fluid pressure.

Correct Answer: George Gabriel Stokes

Solution : The correct option is George Gabriel Stokes.

In 1851, George Gabriel Stokes, an Irish mathematician and physicist, founded the science of hydrodynamics with his law of viscosity. This seminal work described the motion of a small sphere through a viscous fluid, providing fundamental insights into fluid dynamics and paving the way for significant advancements in fluid mechanics. He also made significant contributions to fluid dynamics, optics, and the behaviour of waves, coining the term Stokes' Law for viscous drag in fluids.

Correct Answer: Jahangir

Solution : The correct answer is Jahangir.

Ghiyas Beg was a merchant from Iran. He was the father of Nur Jahan. Ghiyas Beg was appointed chief minister, or Wazir, by Jahangir upon his coronation as Mughal emperor. Jahangir gave his father-in-law the title of Itimad-ud-Daulah, or "Pillar of the Empire." Following her father's death in 1622, Nur Jahan placed an order for a mausoleum.

Correct Answer: P @ Q & R # S

Solution : Given:
A @ B means A is the husband of B.
A & B means A is the mother of B.
A # B means A is the wife of B.

Now, let's check the options –
First option: P @ Q & S # R

From the above family tree, it shows that P is the father of S.

Second option: Q @ P & R # S
According to the given information, the family tree will be –

From the above family tree, it shows that P is the mother-in-law of S.
Third option: P @ Q & R # S
According to the given information, the family tree will be –

From the above family tree, it is evident that the P is the father-in-law of S.
Fourth option: P @ Q & R & S
According to the given information, the family tree will be –

Here, the quadrilateral represents the male and the circular figure represents the female in the figure.
From the above family tree, it shows that P is the grandfather of S.

So, only the third option fulfils the relation as per the family tree. Hence, the third option is correct.

Correct Answer: Negative income effect is greater than substitution effect

Solution : Income effect is greater than substitution effect in giffen goods. Giffen goods are the exceptions to the law of demand.
GIffen goods are those incredibly subpar products that, even if their prices go down, their demand goes down. Giffen products have a strong negative income effect, which indicates that when buyer income rises, so does consumer demand for these products.
Hence option d is the correct answer.