Which of the following would be most useful in testing if a substance is either an acid or a base...? Mcqs

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Which of the following would be most useful in testing if a substance is either an acid or a base...?

(A) pH indicator strips
(B) Acid-base indicator

(C) Litmus paper
(D) Filter paper

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The gases used in different types of welding would include:__________...?

(A) oxygen and hydrogen
(B) oxygen, hydrogen, acetylene and nitrogen

(C) oxygen, acetylene and argon
(D) oxygen and acetylene

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Which one of the following stars are hotter than red and orange stars...?

(A) Green
(B) Dark

(C) Blue
(D) Yellow

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What do we call when the sound of frequency will be below 20 Hz...?

(A) Audio sounds
(B) Infrasonic

(C) Ultrasonic
(D) Supersonics

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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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Vertebrates are divided into how many main groups based on temperature regulation...?

(A) 2
(B) 3

(C) 4
(D) 5

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Which one of the following is non-biodegradable material...?

(A) Plastic
(B) Manure

(C) Wood
(D) Cotton

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Lignite, bituminous & anthracite are different rank of _________ ...?

(A) Iron
(B) Coal

(C) Wood
(D) None of these

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When an object is placed very close to a concave mirror its image will be...?

(A) Virtual
(B) Upright

(C) Larger in size than the object
(D) All of these

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On the Moon, the escape velocity is: __________...?

(A) Less than on Earth due to its lower mass and smaller radius
(B) More than on Earth due to its smaller radius

(C) The same as on Earth because escape velocity is a constant
(D) Dependent on the time of day

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