The permanent hardness of water is due to presence ______...? Mcqs

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The permanent hardness of water is due to presence ______...?

(A) MgSO4
(B) Mg(HCO3)₂

(C) CA(HCO3)2
(D) All of these

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What is known the cold and dense air blowing down from the mountain slope during the night__________...?

(A) Anabatic Wind
(B) Katabatic wind

(C) Lue Wind
(D) None of these

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A French bean plant is a...?

(A) Dicot
(B) Monocot

(C) Tricot
(D) None

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What type of a mirror is used in anti-shop-lifting-devices...?

(A) Convex mirror
(B) Concave mirror

(C) Plane mirror
(D) Both (b) and (c)

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What is ‘Tokamak’ ...?

(A) An Israeli radar system
(B) An American anti-missile system

(C) A defence collaboration between Japan and South Korea
(D) A device used in nuclear-fusion research for magnetic confinement of plasma

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Which one among the following is a hydrocarbon compound...?

(A) Candle wax
(B) Polyurethane

(C) Glycerol
(D) Aspirin

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Most important effect of the moon on earth is that it___________...?

(A) Causes weather change
(B) Causes earthquakes

(C) Causes solar and lunar eclipse
(D) Effects tides of the ocean

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Animals are classified into how many main groups...?

(A) 2
(B) 4

(C) 5
(D) 6

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The ________ system is the closest star system to our sun....?

(A) Promixa Centauri
(B) Alpha Centauri

(C) Red proxima Centauri
(D) None of these

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Which of the following use movable pulleys...?

(A) Water wells
(B) Flags

(C) Bicycles
(D) Cranes

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