The National Physical Laboratory is situated at:
(A) Kolkata
(B) New Delhi
(C) Bombay
(D) None of these

Hint: The National Physical Laboratory, India was one of the earliest national laboratories set up under the Council of Scientific & Industrial Research. Jawaharlal Nehru laid the foundation stone of NPL on 4 January 1947.

Complete step by step answer:
The CSIR- National Physical Laboratory of India, situated in New Delhi, is the measurement standards laboratory of India. It maintains standards of SI units in India and calibrates the national standards of weights and measures.
National Physical Laboratory has the responsibility of realizing the units of physical measurements based on the International System (SI units) under the subordinate legislations of weights & Measures Act 1956 (reissued in 1988 under the 1976 Act).
The main aim of the National Physical laboratory is to strengthen and advance physics-based research and development for the development of science and technology in the country. In particular its objectives are:
To establish, maintain and improve continuously by research, for the benefit of the country, National Standards of Measurements and to realize the Units based on International System,
To identify and conduct after due consideration, research in areas of physics which are most appropriate to the needs of the nation and for advancement of the field.
So, the correct answer is “Option B”.

Note: Dr. K. S. Krishnan was the first Director of the laboratory. The main building of the laboratory was formally opened by Former Deputy Prime Minister Sardar Vallabhbhai Patel on 21 January 1950. Former Prime Minister Indira Gandhi, inaugurated the Silver Jubilee Celebration of the Laboratory on 23 December 1975.