The waves which require a medium for propagation is called
A Electromagnetic waves
B Mechanical waves
C Long waves
D None of them
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An oscillatory vibratory motion is always under
A. A Gravitation force
B. A periodic force
C. An applied force
D. An elastic restoring force
The distance between mean position and extreme position is known as
A. Displacement
B. Amplitude
C. Equilibrium
D. Maximum distance
The time required to complete one vibration is called
A Frequency
B Time period
C Amplitude
D None of these
The number of vibrations executed by an oscillating body in one second is called
A Frequency
B Time period
C Amplitude
D All of these
Which one of the following is not a semi – conductor
A Silicon
B Germanium
C Diamond
D Gallium
A typical example of a semi conductor is
A Germanium
B Mica
C Platinum
D Quartz
The charge carriers inp-type materials are
A Electrons
B Protons
C Negative ions
D Holes
A transistor can be used as
A Voltage amplifier
B Current amplifier
C Oscillator
D All of these