A person of which of the following blood groups is called a universal donor?
A person of which of the following blood groups is called a universal donor?
A. O
B. AB
C. A
D. B
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Human population growth is greatest in developing countries because ?
Human population growth is greatest in develog countries because ?
A. the birth rate is high in develog countries
B. the death rate is high in develog countries.
C. much of the population has already reached the child bearing age.
D. most of the world’s population lives in industrialized countries.Elements which have same number of protons but different number of neutrons are called as _________ ?
Elements which have same number of protons but different number of neutrons are called as _________ ?A. Isotopes
B. Isomers
C. Allotropes
D. AllomersAtoms which have the same number of protons but different numbers of neutrons in the nucleus are known as isotopes. Because of the difference in the number of neutrons, they will have the same atomic number, but varying atomic mass (or mass number).
The most abundant element in the Earth’s crust is __________?
The most abundant element in the Earth’s crust is __________?A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. SiliconOxygen is the most abundant element in the earth’s crust and silicon is next.
What is the name of the branch of the science that studies the ocean?
What is the name of the branch of the science that studies the ocean?A. Oceanography
B. Algology
C. Phology
D. OrintologyLignite, bituminous & anthracite are different rank of _________ ?
Lignite, bituminous & anthracite are different rank of _________ ?A. Iron
B. Coal
C. Wood
D. None of theseAll of the following statements are incorrect except:
All of the following statements are incorrect except:
A. Precision and accuracy should go side by side in a scientific work
B. Scientific work must be precise, accuracy is not essential
C. Scientific work must be accurate, precision is not essential
D. Calculations must be made before any experiment