speed of sound in dry air at 20 °C is___________...?

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speed of sound in dry air at 20 °C is___________...?

(A) 353 m/s

(B) 345 m/s

(C) 343 m/s

(D) none of them

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The most densest substance on the Earth is __________....?

(A) Platinum

(B) Copper

(C) Steel

(D) Osmium

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Virus is__________...?

(A) unicellular

(B) multicellular

(C) acellular

(D) none of these

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Border line which separates outer space from Earth’s atmosphere is known as___________...?

(A) Durand line

(B) Space line

(C) Venus line

(D) Karman line

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The speed of light is __________...?

(A) 280,000 km/s

(B) 300,000 km/s

(C) 320,000 km/s

(D) none of these

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Microphone converts sound energy into ___________...?

(A) Microwaves

(B) Electrical signals

(C) Optical Signals

(D) Heat energy

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The amount of energy required by the children of age between one to three years is___________...?

(A) 300 k Calories

(B) 600 k Calories

(C) 900 k Calories

(D) 1200 k Calories

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Speed of sound in air is _______km/h...?

(A) 1347

(B) 243

(C) 1235

(D) 1495

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The two factors that affect the speed of sound in air are ______...?

(A) Humidity and volume of the air

(B) Temperature and mass of the air

(C) Volume and mass of the air

(D) Temperature and humidity of the air

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

(A) 332 m/s

(B) 345 m/s

(C) 333 m/s

(D) 354 m/s

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The natural source of hydrocarbon is:___________...?

(A) Crude oil

(B) Biomass

(C) Coal

(D) Carbohydrates

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Radon is___________...?

(A) germon radio

(B) radio active gas

(C) artificial fibre

(D) an explosive

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The SI base unit for mass is_____________...?

(A) Gram

(B) Pound

(C) Kilogram

(D) Ounce

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1 yard =___________...?

(A) 3 feet

(B) 6 feet

(C) 2.4 feet

(D) 12 feet

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Mass of Earth is___________...?

(A) 5.972 × 1024 kg.

(B) 6.972 × 1024 kg

(C) 7.972 × 1024 kg

(D) 8.972 × 1024 kg

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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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The Sun is a __________...?

(A) Star

(B) Planet

(C) Asteroid

(D) Meteor

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The largest part of the human brain is ___________...?

(A) Medulla oblongata

(B) Cerebellum

(C) Cerebrum

(D) None of these

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DNA is _____________...?

(A) Acetic Acid

(B) A class of nucleic acids

(C) Citric Acid

(D) None of these

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The time taken by Sun to revolve around the center of our galaxy is___________...?

(A) 150 million years

(B) 250 million years

(C) 300 millon years

(D) 350 millon years

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The density of Air is_____________...?

(A) 0.225 kg/m3

(B) 1.025 kg/m3

(C) 1.225 kg/m3

(D) 1.425 kg/m3

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Dry ice is ___________...?

(A) Methane hydrate

(B) Liquid Nitrogen

(C) Solid Carbon dioxide

(D) Frozen Water

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Main constituent in air is ___________...?

(A) Oxygen

(B) Nitrogen

(C) Hydrogen

(D) Helium

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The energy stored in a dam is___________...?

(A) Kinetic energy

(B) Electrical energy

(C) Potential energy

(D) None of these

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In blood, the percentage of water is___________...?

(A) 75%

(B) 85%

(C) 90%

(D) 95%

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The element used in lead pencils is__________...?

(A) Zinc

(B) Lead

(C) Carbon

(D) Tin

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The type of glass used in making lenses and prism is___________...?

(A) Pyrex glass

(B) jena glass

(C) Flintglass

(D) Soft glass

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The image formed in a compound microscope is_____________...?

(A) erect

(B) inverted

(C) sometimes erect, sometimes inverted

(D) none

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The heaviest man made element found so for is__________...?

(A) Promethium

(B) Ununoctium

(C) Francium

(D) Technetium

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speed of sound in dry air at 20 °C is___________...? Mcqs

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