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⁞ Physics

General Science ➤ Physics ➤ 1
Question 21
Q21.  Sound waves in air are
 

Answer :  longitudinal


Sound waves in air are longitudinal.
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Question 22
Q22.  To an observer on the lunar surface, during daytime, the sky will appear to be
 

Answer :  Black


The lunar sky is always black because diffraction of light requires an atmosphere.
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Question 23
Q23.  Which of the following quantities is the measure of 'inertia' ?
 

Answer :  Mass


In Physics, mass, more specifically inertial mass, can be defined as a quantitative measure of an object's resistance to acceleration.
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Question 24
Q24.  The intensity of a wave

(I) follows inverse square law.
(II) is proportional to its amplitude.
(III) is proportional to the square of the amplitude.
 

Answer :  I and III are true.


The intensity of a wave follows Inverse Square Law and is proportional to the square of the amplitude.
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Question 25
Q25.  Minimum number of unequal vectors which can give zero resultant are
 

Answer :  three


No Explanation Available. You may discuss in the comment box.
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