Which gas is used in refrigerators for cooling...? Mcqs

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Which gas is used in refrigerators for cooling...?

(A) Chlorofluorocarbon
(B) Nitrogen

(C) Helium
(D) Tetrafluoroethene

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Which gas is filled in electric bulb...?

(A) Nitrogen
(B) Oxygen

(C) Carbon dioxide
(D) None of these

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Vitamin C is abundantly found in ...?

(A) Leman
(B) Guava

(C) Apple
(D) Mango

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Which of the following has the maximum density...?

(A) Water
(B) Ice

(C) Benzene
(D) Chloroform

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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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Soap and detergents remove the dirt from clothes due to...?

(A) Capillary action
(B) Osmosis

(C) Diffusion
(D) Lowering of interfacial tension

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What is the study of fossils called...?

(A) Paleontology
(B) Archaeology

(C) Geology
(D) Anthropology

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Biogas produced as a result of anaerobic decay of organic matter consist primarily of_____ gases ...?

(A) N2 & SO2
(B) O2 & N2

(C) NH3 & CO2
(D) None of these

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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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It is not advisable to sleep under a tree at night because of the release of:...?

(A) more oxygen
(B) less oxygen

(C) Carbon dioxide
(D) Carbon monoxide

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