Which of the following equations represents a addition reaction...? Mcqs

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Which of the following equations represents a addition reaction...?

(A) AB → A+B
(B) A → AB

(C) A+B → AB
(D) AB → A+C

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When the moon comes in front of the sun and blocks most of the sunlight from reaching the earth is known as...?

(A) A Solar Eclipse
(B) A Lunar Eclipse

(C) A Venus Eclipse
(D) A Earth Eclipse

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The strongest part(s) of a magnet is/are _________...?

(A) North pole
(B) South pole

(C) North and south pole
(D) Median of north and south pole

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What happens when water solidifies as ice on cooling from 4°C to 0°C...?

(A) Its volume increases and density decreases
(B) Its volume increases and density increases

(C) Its volume decreases and density decreases
(D) Its volume decreases and density increases

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The most abundant element in sea water is...?

(A) Chlorine
(B) Sodium

(C) Sulfur
(D) Magnesium

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Short-sightedness can be corrected by using ___________...?

(A) Convex lens
(B) Concave lens

(C) Convex-concave lens
(D) Concave-convex lens

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Remote sensing is the science of obtaining information about objects or areas on earth from space by using ____...?

(A) Satellite
(B) Radar

(C) Telescope
(D) Aircraft

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The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ...?

(A) red waves
(B) Infrared waves

(C) Ultrasonic
(D) super sonic

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Which of the following celestial bodies contains abundant quantities of helium-3, a potential source of energy...?

(A) Earth
(B) Venus

(C) Moon
(D) Saturn

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The chemical name of Laughing gas is___________...?

(A) Nitric oxide
(B) Nitrogen dioxide

(C) Nitrogen pentoxide
(D) Nitrous oxide

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