The chemical name of chalk is...? Mcqs

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The chemical name of chalk is...?

(A) Sodium nitrate
(B) Zinc sulfate

(C) Sulphuric acid
(D) Calcium carbonate

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Detergents dissolved in water help in cleaning clothes by_________...?

(A) Increasing the temperature of water
(B) Reacting chemically with dirt

(C) Reducing the surface tension of water
(D) Dissolving dirt

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The principal constituent of the atmosphere of the Earth is...?

(A) Oxygen
(B) Carbon

(C) Hydrogen
(D) Nitrogen

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A device that converts mechanical energy into electric energy is called_______...?

(A) Motor.
(B) Transformer.

(C) Coil.
(D) Generator.

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Stars are huge balls of gas mainly consist of _______ and ________...?

(A) Oxygen, Nitrogen
(B) Helium, Oxygen

(C) Hydrogen, Helium
(D) Nitrogen, Carbon

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The life cycle of a bean plant is...?

(A) Seed→Flowering→Germination→Leaf growth
(B) Seed→Germination→Leaf growth→Flowering

(C) Germination→Leaf growth→Flowering→Seed
(D) Germination→Leaf growth→Seed→Flowering

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Which amongst the following cannot pass through vacuum...?

(A) Light
(B) Radiation

(C) Sound
(D) None of These

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The book “Kitab-ul-manazir” was written by ______...?

(A) Jabir bin Hayan
(B) Ibn-al-Haitham

(C) Ali Ibn-Isa
(D) Bu-Ali Sina

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Who developed the telegraph code...?

(A) Andre Ampere
(B) Samuel Morse

(C) Joseph Henry
(D) Jean Fourier

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If a child has cholera, which environment pollution needs to be addressed...?

(A) Land
(B) Water

(C) Air
(D) None

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