Oxygen belongs to group VIA so number of electrons in its valence shell are _____...? Mcqs

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Oxygen belongs to group VIA so number of electrons in its valence shell are _____...?

(A) 3
(B) 4

(C) 5
(D) 6

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The process which is essential for continuing and survival of species is _____...?

(A) Digestion
(B) Respiration

(C) Reproduction
(D) Excretion

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Permanent hardness of water is due to the presence of __________...?

(A) Sodium bicarbonate
(B) Calcium sulfate

(C) Calcium bicarbonate
(D) None of these

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Winter Solstice means____________...?

(A) longest night
(B) longest day

(C) smallest night
(D) smallest day

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Lignite, bituminous & anthracite are different rank of _________ ...?

(A) Iron
(B) Coal

(C) Wood
(D) None of these

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In which of the following, speed of the sound is maximum...?

(A) Gold
(B) Sea water

(C) Air
(D) Space

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Who is the founder of solar system...?

(A) Copernicus
(B) Newton

(C) Galileo
(D) Kepler

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Concave lenses are also known as ______...?

(A) Converging Lens
(B) Diverging Lens

(C) Cylindrical lens
(D) None

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An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of an atom is...?

(A) 11
(B) 12

(C) 22
(D) 23

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The cartilage are made up of cells called...?

(A) Osteoclast
(B) Osteocytis

(C) Chondrocytes
(D) Chaonocytes

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