The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is September 19, 2025 by Admin A. carbon B. hydrogen C. oxygen D. nitrogen ✅ The correct answer is option C.
The nucleus of a hydrogen atom consists of September 19, 2025 by Admin A. 1 proton only B. 1 proton + 2 neutron C. 1 neutron only D. 1 electron only ✅ The correct answer is option A.
The main active constituent of tea and coffee is September 19, 2025 by Admin A. nicotine B. chlorophyll C. caffeine D. aspirin ✅ The correct answer is option C.
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is September 19, 2025 by Admin A. cineole B. engenol C. geraniol D. limonene ✅ The correct answer is option A.
The heat required to raise the temperature of body by 1 K is called September 19, 2025 by Admin A. specific heat B. thermal capacity C. water equivalent D. None of the above ✅ The correct answer is option B.
The major constituent of air is September 19, 2025 by Admin A. nitrogen B. carbon dioxide C. oxygen D. hydrogen ✅ The correct answer is option A.
The National Chemical Laboratory is situated in September 19, 2025 by Admin A. New Delhi B. Bangalore C. Pune D. Patna ✅ The correct answer is option C.
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of September 19, 2025 by Admin A. atomic structure B. metallurgy C. periodic table of contents D. discovery of elements ✅ The correct answer is option C.
The hardest form of carbon is September 19, 2025 by Admin A. coke B. graphite C. diamond D. charcoal ✅ The correct answer is option C.
The inherited traits of an organism are controlled by September 19, 2025 by Admin A. RNA molecules B. nucleotides C. DNA molecules D. enzymes ✅ The correct answer is option C.