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Yes, I agree that caste has not disappeared from contemporary India:
(i) Some of the older aspects of casts are continuing.
(ii) Even now, most people marry within their own caste or tribe.
(iii) Untouchability has not ended completely, despite constitutional prohibition.
(iv) The caste groups that had access to education under the old systems have done very well in acquiring modern education as well.
(v) Those groups that did not have access to education or were prohibited from acquiring it have naturally lagged behind. Caste continues to be closely linked to economic status.

Enthusiasm of the merchants and industrialists faded away during the later stage of CDM due to following reasons: 

(i) The industrialists attacked the colonial control over the Indian economy and supported the Civil Disobedience Movement when it was first launched They gave financial assistance and refused to buy or sell imported goods. 

(ii) Most businessmen came to see swaraj as a time when colonial restrictions on business would no longer exist and trade and industry would flourish without constraints. 

(iii) But, after the failure of Round Table Conference, business groups were no longer uniformly enthusiastic. 

(iv) They were apprehensive of the spread of militant activities and worried about prolonged disruption of business, as well as of the growing influence of socialism amongst the younger members of the Congress.

Peasants had to do begar at landlords’ farms who demanded high rents from the peasants. The movement was against them. As the movement spread in 1921, the houses of talukdars and merchants were attacked, bazaars were looted and grain hoards were taken over.

Main causes and events of civil disobedience movements were:

• Appointment of Simon Commission.
• Nehru Report.
• Salt Satyagraha.
• Declaration of Poorna Swaraj.

(i) After the Lahore resolution of complete independence, it was decided to launch on country-wide movement for freedom.
(ii) No one knew better than Gandhiji how to wake people’s conscious of their hidden strength.
(iii) So he had to find a way to relate this abstract idea of freedom to move concrete issues of everyday life.
(iv) He found in salt a powerful symbol that could unite the nations. CDM differed from NCM in the following ways.
(i) Non-cooperation movement was launched between 1920 and 1922, while the Civil Disobedience Movement continued from 1930 to 1934.
(ii) The NCM was launched because of the anger of Jallianwala Bagh tragedy and the CDM was launched to protect the arrival of the Simon Commission.
(iii) NCM began with the surrender of titles, a boycott of British Institutions and goods whereas CDM began with defying and breaking the colonial laws, like the salt law.
(iv) NCM aimed for Sawaraj or self-government CDM demanded complete independence or Purna Swaraj.
(v) The NCM got the support of almost all sections of the society whereas CDM had many limitations. The Dalits, Muslims industrial workers and businessmen did not participate fully.

Let the width of the unplanted area be x m
Then, dimensions of area to be planted 

= (120 – 2x) and (100 – 2x)
= (120 – 2x) (100 – 2x) = 120 × 100 – 10500
⇒ 12000 – 440x + 4x² = 1500 or x² – 110x + 2625 = 0
⇒ (x – 75)(x – 35) = 0 or x = 75, 35

But x = 75 is not possible
x = 35

Thus, dimensions of area to be planted = (120 – 70) and (100 – 70) i.e., 50 m and 30 m.Afforestation is being discussed here. Planting more trees helps in reducing air pollution and make the environment clean and green.

Let (5 + 3√2  ) be a rational number

 5 + 3√2 = P / q

(Where q ≠ 0 and p and q are co- prime number)
3√2 =  P / q - 5

√2 =  (p -5q )/ 3q

p and q are integers and g ≠ 0

(p -5q) / 3q   is rational number

 √2  is a rational number but √2  is irrational number.

This contradiction has arisen because our assumption is wrong. So we conclude that (5+3√2)  is an irrational number.

The compounds that are formed due to sharing of electrons between. two atoms/ compounds having covalent bonds. 
Ionic compounds are formed due to a transfer of electrons from one atom to another / compounds having ionic bonds/ compounds having the attraction between oppositely charged ions 
(i) They are poor conductors of electricity
(ii) They have low melting and boiling point. ( or any other)

Decentralisation is a major step towards modifying the concept of democracy and federalism. It is very significant for all practical aspects.

 (i) It helps in the settlements of a large no. of problems and issues at the local level.

 (ii) It provides a platform for the direct participation of people in decision making. Hence, inculcates a habit of democratic participation. 

(iii) In another way, decentralization in the form of local self-government is the best way to realize principles of democracy i.e., democracy at the grassroot level. Thus, decentralization is the rationale for the federal concept.

When the demand for the formation of states on the basis of language was raised, some national leaders feared that it would lead to the disintegration of the country. But the experience has shown that the formation of linguistic states has actually made the country more united.

The French needed an educated local labour force but they feared that education might create problems. Once educated, the vietnamese may begin to question colonial domination. French also feared that they might loose their jobs to educated Vietnamese.

If a patient requires repeated blood transfusion, he must ensure that the donor's blood has been screened for HIV and other pathogens before transfusion.