The ozone layer is at height of________kilometers from the surface of the Earth...? Mcqs

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The ozone layer is at height of________kilometers from the surface of the Earth...?

(A) 10 to 20
(B) 20 to 30

(C) 30 to 40
(D) 40 to 50

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Covalent network crystals have_____________...?

(A) higher melting point then molecular crystals
(B) lower melting point then molecular crystals

(C) discrete molecules linked by Van der waals forces
(D) hydrogen bonding

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Angle of friction and angle of repose are...?

(A) equal to each other
(B) not equal to each other

(C) proportional to each other
(D) None of these

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What are the primary colors of Pigment...?

(A) White, Black, Blue
(B) Red, Yellow, Blue

(C) Red, Orange, Blue
(D) Red, Green, Blue

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The springs in brakes and clutches are used ______...?

(A) To restore original position
(B) To measure forces

(C) To absorb shocks
(D) To absorb strain energy

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Which of the following phenomena occur when a small amount of acid is added to water...?

(A) Precipitation and Neutralization
(B) Evaporation and Condensation

(C) Sublimation and Deposition
(D) Dilution and Ionisation

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Which of the following is an example of a chemical reaction...?

(A) Water freezing into ice
(B) Sand settling to the bottom of a pool

(C) Leaves changing colors in the fall
(D) A rock rolling down a hill

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Which of the following is a non-luminous object...?

(A) Burning coal
(B) Glassware

(C) Fireworks
(D) Jupiter

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Which are the found in fruits, vegetables, grains and sea food...?

(A) Minerals
(B) Enzymes

(C) Hormones
(D) Fats

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Which lens is used for the correction of long-sightedness...?

(A) Convex lens
(B) Concave lens

(C) Compact lens
(D) Conpave lens

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