Which layer of the atmosphere reflects radio waves back to the earth’s surface...? Mcqs

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Which layer of the atmosphere reflects radio waves back to the earth’s surface...?

(A) Troposphere
(B) Stratosphere

(C) Ozone layer
(D) Ionosphere

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The heaviest naturally-occurring element is_________...?

(A) Radium
(B) Platinum

(C) Uranium
(D) Cadmium

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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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What is the name of bacteria that causes Lyme Disease....?

(A) Escherichia Coli
(B) Staphylococus aureus

(C) Borrelia burgdorferi
(D) None of these

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Science is derived from Latin word “scientia” which means_________...?

(A) Reasoning
(B) Logic

(C) Knowledge
(D) Life

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How many layers does sun have ...?

(A) 6
(B) 4

(C) 7
(D) 3

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Why the colour of the Ocean appears blue...?

(A) Because the sunlight falling on it is scattered.
(B) Because the sunlight falling on it is absorbed.

(C) Because the sunlight falling on it is refracted.
(D) Because the sunlight falling on it is reflected.

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Select the odd one of the followings...?

(A) Active transport
(B) Diffusion

(C) Facilitated diffusion
(D) Osmosis

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According to the theory of relativity, which of the following always remains constant ...?

(A) Length of an object
(B) Time

(C) Space
(D) Velocity of light

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The metal, which is a constituent of vitamin B12 is____________...?

(A) Iron
(B) Magnesium

(C) Zinc
(D) Cobalt

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