Which of the following statements are correct for ’technology’ ?
(A) Understanding of concepts of friction and heat enabled us to conquer many diseases.
(B) Technology indicates the level of cultural development of society.
(C) Technology loosens the shackles of the environment on human beings.
(D) Human beings interact with their physical environment with the help of technology.
Choose the correct answer from the options given below:

The correct option is (B), (C) and (D) only.

To understand why this is the correct choice, let us analyze each of the statements individually:

Statement (A): "Understanding of concepts of friction and heat enabled us to conquer many diseases."
This statement is incorrect. The understanding of friction and heat historically led to the discovery and harnessing of fire. The conquest of various diseases, on the other hand, was enabled by advancements in biological sciences, such as the understanding of pathogens, genetics, and DNA. Therefore, statement (A) does not represent a correct relationship.

Statement (B): "Technology indicates the level of cultural development of society."
This statement is correct. Technology is a product of human knowledge and cultural evolution. The sophistication of a society's tools, infrastructure, and machinery reflects its level of cultural development and its capacity to solve complex problems.

Statement (C): "Technology loosens the shackles of the environment on human beings."
This statement is correct. Initially, humans were passive subjects to environmental forces. As technology advanced—through the creation of shelter, climate control, modern agriculture, and medicine—humanity reduced its direct vulnerability to harsh environmental conditions, thereby loosening nature's control over human survival.

Statement (D): "Human beings interact with their physical environment with the help of technology."
This statement is correct. Technology serves as the primary medium or interface through which humans engage with, utilize, and modify their physical environment to meet their needs.

Conclusion:
Since statements (B), (C), and (D) are correct while statement (A) is incorrect, the correct response is (B), (C) and (D) only.