Final term

Any thing that travels faster than the speed of sound is called ______

• Supersamic sound

• Altrasonic sound

• Supersonic sound

• Infrasonic sound

^{The speed of sound through steel is_____}

• 1498m/s

• 340m/s

• 5180m/s

• 658m/s

One complete to and fro motion is called_____

• Pitch

• Oscillation

• Amplitude

• Hertz

The S.I unit for frequency of sound is ______

• Decibals

• Hertz

• Pitch

• None of these

The voice box in human beings is called

Sound cannot travel through _______

• Vaccum

• Air

• Freezer

• Hot air balloon 🎈

Which of the following conducts electricity ?

• Rain water

• Tap water

• Sea water

• All of these

LED means

• Light emittey diode

• Light emitting diode

• Both a and b

• None of these

Cathode means ___ charge electrode.

• Positively

• Negativity

Pure water or distilled water is a ______ conductor

• Bad

• Good