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Q : “The four quantum numbers of any two electrons in an atom are not identical” is
(A) Hund's law
(B) Pauli's exclusion principle
(C) Heisenberg's Uncertainty Principle
(D) Avogadro's law
The atomic number of carbon is 6, the atomic weight is 12. How many protons are there in the nucleus of carbon?
(A) 6
(B) 12
(C) 18
(D) 0
Carbon-12: with 6 protons and 6 neutrons and an atomic mass of 12.
The atomic number of an atom of an element is 17 and the mass number is 36. The number of neutrons in its nucleus is
(A) 17
(B) 19
(C) 36
(D) 53
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is 19.
The mobility of conduction band electrons is greater than that of holes because
(A) they are light
(B) they collide less often
(C) they have negative charge
(D) they require less energy to move
In a semiconductor the mobility of electrons (referring to 'conduction electrons' or 'free-electrons') is greater than that of a holes (indirectly referring to 'valence electrons') because of different band structure and scattering mechanisms of these two carrier types
The chemical behaviour of an atom depends on its:
(A) on the number of protons in the nucleus
(B) on the number of neutrons in the nucleus
(C) on the number of electrons revolving around the nucleus
(D) on the number of nucleons in the nucleus
The chemical properties of an element depend on the atomic number of that element. The chemical properties depend on the number of the electrons and the configuration of the valence electrons of that element.
The tissue from which the epidermis is formed is
(A) Dermatogen
(B) Valkutzen
(C) Rangbhan
(D) Gopakjan
Dumbbell-shaped gate-cells are present in?
(A) Groundnut
(B) Gram
(C) Wheat
(D) Mango
To whom are the green blocks related?
(A) Green cover
(B) Ministry of Green
(C) Bio bricks
(D) Pro-biotic curd
In which of the following is “Bari Pind” found?
(A) Sperm
(B) Sertoli Cell
(C) Female Somatic Cell
(D) Male Vegetative Cell
Glucose is a type of
(A) Pentose sugar
(B) Hexose sugar
(C) Tetrose sugar
(D) Diose sugar
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