Speed of sound in air per second is :...? Mcqs

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Speed of sound in air per second is :...?

(A) 250 meters
(B) 331 meters

(C) 434 meters
(D) 343.2 meters

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Echo is a ___________ of sound...?

(A) Reflection
(B) Refraction

(C) Interference
(D) None

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Which type of bond is formed between H₂O molecules...?

(A) Hydrogen bond
(B) Ionic bond

(C) Covalent bond
(D) All of these

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Night vision is possible with the help of ___________...?

(A) Red light
(B) Violet light

(C) Infrared Rays
(D) Ultra violet Light

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Reflecting prisms usually work on the principle of total ____...?

(A) Internal Reflection
(B) External Reflection

(C) Refraction
(D) Diffraction

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The only source of energy on earth is ____...?

(A) Moon
(B) Star

(C) Water
(D) Sun

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The PH of milk is __________...?

(A) 6.0
(B) 6.5

(C) 7.0
(D) 7.5

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Oil of vitriol is_________...?

(A) Nitric acid
(B) Hydrochloric acid

(C) Phosphoric acid
(D) Sulfuric acid

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Earth revolves around the sun from...?

(A) East to West
(B) West to East

(C) South to North
(D) North to South

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Smallpox was eradicated in 1970s. What was the ‘great pox’ which remains active...?

(A) Bubonic plague
(B) Syphilis

(C) Measles
(D) None

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