The speed of the sound in air is ______...? Mcqs

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The speed of the sound in air is ______...?

(A) 143 m/s
(B) 243 m/s

(C) 343 m/s
(D) 443 m/s

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A Refracting telescope consists of ____...?

(A) A primary mirror and A secondary mirror
(B) A primary lens and A secondary lens

(C) A primary lens and A secondary mirror
(D) A primary mirror and A secondary lens

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Decibel (dB) is the unit which can be used to measure the:...?

(A) Amplitude
(B) Wavelength

(C) Pitch
(D) None

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The term PVC used in the plastic industry stands for______________...?

(A) Phosphavinyl chloride
(B) Phosphor vanadiu chloride

(C) Polyvinyl chloride
(D) Polyvinyl carbobate

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Rainbow is formed due to ______...?

(A) Emission of light
(B) Absorption of light

(C) Refraction of light
(D) Transmission of sound

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The type/s of pollution is/are ______...?

(A) Air Pollution
(B) Water Pollution

(C) Land Pollution
(D) All of these

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The causes of the echo is _____...?

(A) Absorption
(B) Dispersion

(C) Reflection
(D) Refraction

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which one is the most common disease...?

(A) Dental
(B) Leprosy

(C) Headache
(D) Migraine

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Which are the secondary consumers and eat primary consumers (birds and mouse)...?

(A) Herbivores
(B) Carnivores

(C) Omnivores
(D) None

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What is the direction of the magnetic field lines inside a bar magnet...?

(A) From north pole to south pole
(B) South pole to north pole

(C) From side to side
(D) There are no magnetic field lines

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