Correct Answer: must be same

Solution : The correct option is must be the same.

Isotopes are atoms with the same number of protons but different numbers of neutrons. It has the same atomic number but a different mass number. Since the number of electrons in an element's isotopes

Correct Answer: Engel's Law

Solution : The correct option is Engel's Law.

According to Engel's Law, even though the quantity spent on food increases in absolute terms, the percentage of income spent on food drops as income rises. Based on the observation that when income levels rise, people tend

Correct Answer: Heinrich Friedrich Lenz

Solution : The correct answer is Heinrich Friedrich Lenz.

Heinrich Friedrich Lenz was a Russian physicist of German origin who independently formulated what is known as Lenz's Law in 1834. Lenz's law articulates that when a magnetic field around a conductor changes, the induced

Correct Answer: International Labour Organisation

Solution : The correct option is the International Labour Organisation.

One of the first and most specialized UN organisations, the International Labour Organisation was established by the League of Nations in October 1919. Setting global labour standards is part of its purpose to enhance social

Correct Answer: Gossen

Solution : Gossen is the proponent of the Law of Diminishing Marginal Utility.
The Law of diminishing marginal utility states that the marginal utility of a good or service declines as more of it is consumed by an individual.
 

Correct Answer: Article 21

Solution : The correct option is Article 21.

The article of the Indian Constitution that declares that no person shall be deprived of their life or personal liberty except according to the procedure established by law is Article 21. 

Correct Answer: Abrogate

Solution : The correct option is the first option.

Explanation:
Abrogate means to cancel or repeal a law, agreement, or formal agreement between two parties. It specifically refers to the act of officially ending or abolishing something, especially a legal document or a law.

Therefore, the

Correct Answer: A, B and C all are correct

Solution : If the demand for a good is inelastic, an increase in its price will cause the total expenditure of the consumers of the good to increase. Raising prices will always cause total revenue to increase.
Hence d is the

Correct Answer: INR 100

Solution : Given: A librarian purchased 60 storybooks for his library.
Let the cost price of each book be INR $x$.
According to the question,
$60x+336=64(x-1)$
$⇒60x+336=64x-64$
$⇒4x=400$
$\therefore x= 100$
Hence, the correct answer is INR 100.

Correct Answer: Mother-in-law

Solution : Following the instructions of the question, the family tree will be –

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

So, Maaya is the mother-in-law of Preeti. Hence, the first option is correct.