Second layer of Earth’s atmosphere is__________...? Mcqs

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Second layer of Earth’s atmosphere is__________...?

(A) Stratosphere
(B) Mesosphere

(C) Troposphere
(D) Thermosphere

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The audible range of normal human ear is ____...?

(A) 16 Hz to 20kHz
(B) 10 Hz to 31kHz

(C) 67 Hz to 45kHz
(D) 20 Hz to 20kHz

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Chemically finger nails are made up of ____________...?

(A) Carbohydrate
(B) Fats

(C) protein
(D) Starch

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Scalar quantities have ______ and suitable unit....?

(A) Magnitude
(B) Direction

(C) Both a and b
(D) None of them

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Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ...?

(A) Zeolites
(B) Sulphonides

(C) Lime
(D) Nitrates

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An atom has atomic number 16 and mass number 32, the number of protons is...?

(A) 32
(B) 14

(C) 16
(D) 18

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A common skin condition that causes skin redness and irritation is known as_________...?

(A) Psoriasis
(B) Hypermetropia

(C) Leukoderma
(D) Diphtheria

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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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What is the particle size in suspension...?

(A) 10 nm^3
(B) 10 nm^2

(C) Less than 10 nm^3
(D) Greater than 10 nm^3

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At which temperature does bacteria die...?

(A) 102F
(B) 106F

(C) 149F
(D) None of These

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