General Science Class 6th MCQs=745

• Sound is a form of energy.
  
• Sound travels as longitudinal waves.
  Three things
• Three things are necessary for hearing sound.
• Sound producing body
• a)    Medium for traveling of sound 
• b)    Receiving device
• Longitudinal waves comprise of compression and rarefaction.
• Human can hear in frequency range between 20Hz to 20,000Hz.
• Sound can travel through solids, liquids and gases.
• Sound cannot pass through vacuum.
• The speed of sound in air at 0⁰C is 332 m/s.
• If the temperature is increase, the speed of sound increases.
• The speed of sound at 20⁰C is 344m/s.
• The speed of sound in water is 1525 m/s.
• The speed of sound in iron is 5130 m/s.
• Back and forth movement of an object is called vibration.

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Sound cannot travel through………………. NTS PST 15/12/2019 (8:30)
a) Iron                         
b) Wood         
c) Water                      
d) Vacuum

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Human ear has…………distinct pats.
a) Four                                    
b) Two            
c) One                         
d) Three

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Sound propagates maximum in……………
a) Gas                         
b) Liquid         
c) Solid                       
d) All

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Speed of sound ……..in air with increase is temperature. NTS PST –P-2----(date not confirm)
a) Increase                 
b) Decrease     
c) Remain same                      
d) Both b and c

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Speed of sound in Iron is………..
a) 5130 m/s                 
b) 1530 m/s
c) 3150 m/s  
d) 1503 m/s

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