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Learn RAILWAY MCQs with answers [Page 6 of Department 108]

K

Kirti • 10.37K Points
Tutor II Physics 

51) Velocity of sound in air does not depend on

(A) Density of air
(B) Temperature of air
(C) Pressure of air
(D) Humidity of air
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Correct Answer - Option (C)

Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.

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K

Kirti • 10.37K Points
Tutor II Physics 

54) Sound travels fastest in

(A) Vacuum
(B) Air
(C) Glass
(D) Water
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Correct Answer - Option (C)

Explanation :
Sound is a mechanical vibration and needs a medium for propagation. The higher the density of the medium, the faster the sound travels. So, sound cannot travel through vacuum. As the sound travels faster in solids than liquids and gases, sound travels faster in the glass than Air and water.

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R

Ravinder Singh • 2.62K Points
Extraordinary Chemistry 

56) All isotopes of the same element have

(A) Different atomic numbers and different atomic mass
(B) Different atomic numbers and the same atomic mass
(C) The same atomic number but different atomic masses
(D) The same atomic number and the atomic mass
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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

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You are learning MCQ Questions of RAILWAY Department : 108 | Page : 6

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