In which layer of atmosphere does commercial aircrafts usually fly...? Mcqs

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In which layer of atmosphere does commercial aircrafts usually fly...?

(A) Stratosphere
(B) Troposphere

(C) Mesosphere
(D) Thermosphere

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Which synthetic fibre is known as artificial Silk...?

(A) Nylon
(B) Rayon

(C) Cotton
(D) Terylene

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Two resistances of 6 Ω and 12 Ω are connected in parallel. Their net resistance is ______...?

(A) 7 Ω
(B) 6 Ω

(C) 4 Ω
(D) 5 Ω

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What is the weight of the average human brain...?

(A) 1.2 to 1.4 Kg
(B) 1.4 to 1.8 Kg

(C) 2.1 to 2.8 Kg
(D) 3.1 to 3.4 Kg

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Percentage of water in an apple is__________...?

(A) 84%
(B) 90%

(C) 66%
(D) None of these

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Which is the hardest substance in the human body...?

(A) Tooth enamel
(B) Skull

(C) Knee cap
(D) Rib

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What does "dehydration" mean...?

(A) Addition of water
(B) Removal of water

(C) Conversion of water into vapor
(D) Absorption of water

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The set of colours obtained in seven different colours components way is called...?

(A) Rainbow
(B) Spectrum of Light

(C) Dispersion
(D) Prism

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When sound waves travel from air to water which of the following quantities remains unchanged...?

(A) Speed
(B) Frequency

(C) Intensity
(D) Wavelength

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Huge cloud of gass and dust in the universe is called...?

(A) Constellation
(B) Satellite

(C) Meteorite
(D) Nebula

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