Which of the following gases is used for refrigeration...? Mcqs

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Which of the following gases is used for refrigeration...?

(A) Chlorine
(B) Ammonia

(C) Phosphine
(D) Carbon Dioxide

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Which is the oldest freezing method:...?

(A) Contact freezing
(B) Flash freezing

(C) Brine freezing
(D) None of these

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Vaccination was discovered by...?

(A) Galileo
(B) Edward Jenner

(C) Baird
(D) Roentgen

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Plants exhale at night time which gas...?

(A) O2
(B) H20

(C) Co1
(D) CO2

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Solid can be converted directly to the gaseous state. This process is known as:...?

(A) Sublimation
(B) Evaporation

(C) Condensation
(D) Diffusion

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The Third Most abundant element is:...?

(A) Oxygen
(B) Silicon

(C) Aluminium
(D) None ofthese

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Bronze is an alloy of...?

(A) Copper and Bronze
(B) Lead and Tin

(C) Copper and Tin
(D) None of these

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The most abundant metal in the earth's crust is:...?

(A) Zinc
(B) Copper

(C) Aluminum
(D) Iron

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Another name for baking soda is:...?

(A) Sodium Bicarbonate
(B) Sodium Carbonate

(C) Sodium Sulphate
(D) Sodium Hydroxide

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A matter can exist in which of the following forms...?

(A) Liquid
(B) Solid

(C) Gas
(D) All of these

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