How much percentage of water on the earth is freshwater...? Mcqs

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How much percentage of water on the earth is freshwater...?

(A) 2.5%
(B) 3.5%

(C) 4.5%
(D) 5.5%

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The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg...?

(A) 4 days
(B) 12 days

(C) 16 days
(D) 8 days

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A fresh egg when placed in salt water will __________ ...?

(A) sink and go to the bottom
(B) sink but will not go to the bottom

(C) Float
(D) Burst

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Any biological region recognized by its climate or vegetation is called...?

(A) Ecosystem
(B) Biomes

(C) Biosphere
(D) Biomass

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Aviation fuel for Jet Aeroplanes consists of purified________...?

(A) Petrol
(B) Kerosene

(C) Gasoline
(D) Diesel

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In the taxonomic hierarchy choose the term which encompasses all other in the list...?

(A) Genus
(B) Species

(C) Order
(D) Class

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The earth’s atmosphere is divided into layers based on the vertical profile of __________...?

(A) Air pressure
(B) Air temperature

(C) Air density
(D) Wind speed

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Stars are huge balls of gas mainly consist of _______ and ________...?

(A) Oxygen, Nitrogen
(B) Helium, Oxygen

(C) Hydrogen, Helium
(D) Nitrogen, Carbon

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The solar wind can reach speeds of up to...?

(A) 600 km/s
(B) 700 km/s

(C) 800 km/s
(D) 650 km/s

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The production of rubber tree is better adopted to areas where the climate is_________...?

(A) Warm and humid
(B) Warm and dry

(C) Cool and moist
(D) cool and dry

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