The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________...? Mcqs

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The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________...?

(A) 1120 ft
(B) 120 ft

(C) 56 ft
(D) 100 ft

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The change from liquid to solid, or the reverse of melting, is called...?

(A) Melting
(B) Freezing

(C) Evaporation
(D) Condensation

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Materials for rain-proof coats and tents owe their water proof properties to________...?

(A) Surface tension
(B) Viscosity

(C) Specific gravity
(D) Elasticity

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Which of the following are made up of two or more substances that are not chemically combined...?

(A) Compounds
(B) Elements

(C) Solutions
(D) Mixtures

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Sunlight is made of__________colours...?

(A) Seven colours
(B) Five colours

(C) Three colours
(D) Non of these

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How many elements are in modern periodic table...?

(A) 118
(B) 181

(C) 108
(D) 188

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Which of the following occurs when light passes through a substance unchanged...?

(A) Transmission
(B) Reflection

(C) Absorption
(D) Refraction

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The gonads are the target organ for ______...?

(A) FSH
(B) LH

(C) Both a & b
(D) None of these

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The number of spark plugs needed in a diesel engine is ______...?

(A) Zero
(B) 1

(C) 2
(D) 4

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Sputnik-1 was the first manmade spacecraft, which was launched on October 4, 1957 by the ____...?

(A) Soviet Union
(B) United States of America

(C) China
(D) Great Britain

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