Which of the following atmospheric layers help in radio communication...? Mcqs

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Which of the following atmospheric layers help in radio communication...?

(A) Exosphere
(B) Ionosphere

(C) Troposphere
(D) Stratosphere

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Rate of evaporation of a liquid can be increased by _____...?

(A) Increasing humidity
(B) Decreasing temperature

(C) Increasing its boiling point
(D) Decreasing atmospheric pressure

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What is the Chemical formula of Zinc Hydroxide _________ ...?

(A) Zn(OH)2
(B) ZNO2

(C) Zn2(OH)3
(D) ZnOH

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Butter is example of solution...?

(A) Gas-liquid
(B) Solid-liquid

(C) Liquid-solid
(D) Gas-solid

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A man can survive without food for at least...?

(A) One month
(B) Two month

(C) Three month
(D) Four month

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The universe is continuously ____...?

(A) Contracting
(B) Expanding

(C) Static
(D) None of these

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The flow of charge that changes direction periodically is called...?

(A) Electric Potential (EP)
(B) Electric Resistance (ER)

(C) Alternating Current (AC)
(D) Direct Current (DC)

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The top atmosphere of the Earth directly reflects back into space nearly what part of the total amount of sun’s energy coming to it...?

(A) 10%
(B) 20%

(C) 30%
(D) 50%

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Titan, a moon of __________ , and Triton, a moon of _________ , have atmospheres mainly of _________....?

(A) Saturn, Jupiter, Hydrogen
(B) Uranus, Neptune, Nitrogen

(C) Saturn, Neptune, Nitrogen
(D) Mars, Venus, Hydrogen

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Deforestation will decrease...?

(A) Soil erosion
(B) Rainfall

(C) Landslides
(D) Soil fertility

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