Which of the following can be used to reduce friction between moving parts of machines...? Mcqs

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Which of the following can be used to reduce friction between moving parts of machines...?

(A) Sand
(B) Grease

(C) Gears
(D) Screws

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Which part of a D.C motor reverses the direction of current through the coil every half-cycle...?

(A) The armature
(B) The commutator

(C) The brushes
(D) The slip rings

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Milk, meat, eggs and pulses provide us...?

(A) Protein
(B) Vitamin

(C) Mineral
(D) Carbohydrate

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The repetition of property after a certain interval called ___________...?

(A) Electron efinity
(B) Atomic radius

(C) periodicity of property
(D) none of these

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Animals that eat only animals are called...?

(A) Carnivores
(B) Herbivores

(C) Omnivores
(D) None

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Air Conditioning Controls:___________...?

(A) Circulation of the Air
(B) Humidity

(C) Temperature
(D) All of The Above

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A fathom is equal to ________feets...?

(A) 6
(B) 5

(C) 4
(D) 3

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What happens when oil is burnt...?

(A) Carbon dioxide and energy will be released
(B) Carbon monoxide and water will be released

(C) Oxygen and carbon will be released
(D) Nitrogen and hydrogen will be released

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The matter of our sun is in ________ state...?

(A) Liquid
(B) Gas

(C) Solid
(D) Plasma

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Degree of variation within or among the species exists on different regions of the earth called...?

(A) Adaptation
(B) Extinction

(C) Evolution
(D) Biodiversity

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