Correct Answer: 1800

Solution : The correct option is 1808.

When we talk about Joseph Louis Gay-Lussac's law of combining volumes of gases, which was discovered in 1808 and published in 1809, we normally mean Gay-Lussac's law.

Correct Answer: George Simon Ohm

Solution : The correct option is G.S. Ohm.

The law of electric resistance is commonly attributed to George Simon Ohm. He formulated Ohm's Law, which describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. Ohm's law is fundamental to the understanding of electrical circuits and is expressed by the equation V = I * R, where V is voltage, I is current, and R is resistance.

Correct Answer: Restore law and order in Punjab

Solution : Correct Option: Option 2
Explanation: Operation Blue Star aimed to restore law and order in Punjab by removing Sikh militants from the Golden Temple.

Correct Answer: Teacher

Solution : According to the given information, the family tree is as follows –

Here, the quadrilateral represents the male, and the circular figure represents the female in the figure.

So, from the above family tree, P is a teacher by profession. Hence, the fourth option is correct.

Correct Answer: Nephew

Solution : As per the given information, the family tree will be as follows –

Here, the quadrilateral represents the male, and the circular figure represents the female in the figure.

So, from the above family tree, Ronit is the nephew of Mukesh. Hence, the second option is correct.

Correct Answer: J is the mother of S

Solution : Given:
A # B ⇒ A is the husband of B
A @ B ⇒ A is the sister of B
A & B ⇒ A is the mother of B
A % B ⇒ A is the son of B

As per the given information, the family tree will be as follows –

Here, the quadrilateral represents the male and the circular figure represents the female in the figure.
Now, let's check the options –
First option: K is the father-in-law of N – From the above family tree, it is evident that K is the father-in-law of N. So, this option is correct.
Second option: R and T are brothers – From the above family tree, it is evident that R and T are brothers. So, this option is correct.
Third option: Z is the sister of T – From the above family tree, it is evident that Z is the sister of T. So, this option is correct.
Fourth option: J is the mother of S – From the above family tree, it is evident that J is the mother-in-law of S. So, this option is incorrect.

Hence, the fourth option is correct.

Correct Answer: Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation
of Assertion (A)

Solution : The rule of demand—the inverse relationship between prices and quantity demanded—is once again demonstrated by the downward slope of the demand curve.
It is due to the law of diminishing marginal utility 
The law of diminishing marginal utility states that all else equal, as consumption increases, the marginal utility derived from each additional unit declines.
Hence a is the correct answer.

Correct Answer: Related to goods

Solution : It is related to goods only.
Alfred Marshall proposes the law of equi-marginal utility.
'If a person has a goods that can be put to several uses, he will distribute it among these uses in such a way that it has the same marginal utility in all,' says Prof. Marshall.
Hence option b is the correct answer.

Correct Answer: The marginal utility derived from the good decreases at a decreasing rate.

Solution : The answer is (d) The marginal utility derived from the good decreases at a decreasing rate.

The law of diminishing marginal utility states that as a consumer consumes more of a good, the marginal utility derived from each additional unit of the good decreases. This means that the first unit of the good provides the most utility, the second unit provides less utility, and so on.

The law of diminishing marginal utility is an important concept in economics because it helps us to understand how consumers make decisions about what goods and services to purchase. It also helps us to understand why demand curves are downward sloping.

Correct Answer: Provide information required by law 

Solution : Labelling provides information required by law. For example the statutory warning on the package of cigaret or Pan masala, smoking is injurious to health or chewing tobacco is injurious to health. In case of hazardous goods or poisonous material appropriate safety warning is also required to be put on the label.

Hence, option B is correct.