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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Which of the following have maximum calorific value...?

(A) Carbohydrates
(B) Fats

(C) Proteins
(D) Vitamins

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At which temperature does bacteria die...?

(A) 102F
(B) 106F

(C) 149F
(D) None of These

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When a warm air is lifted off the surface in temperature depression it is called ________...?

(A) An occlusion
(B) A cold front

(C) An anticyclone
(D) A warm front

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Iodised salts contains the iodine salts of which metal...?

(A) Iodine
(B) Potassium

(C) Sodium Chloride
(D) Chlorine

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What divides the Earth into the Northern and the Southern Hemispheres...?

(A) Axis of rotation
(B) Equator

(C) North Pole
(D) South Pole

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Which gas is used in preparation of Soda water...?

(A) Ammonia
(B) Hydrogen

(C) Nitrogen
(D) Carbon Dioxide

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What are the reactants in the reaction: CH4 + 2O2 → CO2 + 2H2O...?

(A) Methane and Oxygen
(B) Carbon dioxide and Water

(C) Hydrogen and Oxygen
(D) Carbon and Water

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The chemical used as a fixer in photography is__________...?

(A) sodium sulphate
(B) borax

(C) sodium thiosulphate
(D) ammonium sulphate

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Ozone layer is part of ______...?

(A) Mesosphere
(B) Stratosphere

(C) Thermosphere
(D) Troposphere

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