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A pendulum completes 20 vibrations in 10 s. What is its frequency?

• 1 10 Hz
• 2 2 Hz
• 3 200 Hz
• 4 0.5 Hz

The time period T and frequency f are related by:

• 1 T = 2 f
• 2 T = 1 / f
• 3 T = f²
• 4 T = f

A wave has frequency 50 Hz and wavelength 4 m. What is its speed?

• 1 12.5 m/s
• 2 200 m/s
• 3 46 m/s
• 4 54 m/s

Sound waves are:

• 1 Transverse waves
• 2 Not waves
• 3 Electromagnetic waves
• 4 Longitudinal waves

In a transverse wave, the particles of the medium vibrate:

• 1 At right angles to the direction of the wave
• 2 They do not move
• 3 In circles only
• 4 Along the direction of the wave

The period of a simple pendulum depends on its:

• 1 Material
• 2 Mass
• 3 Colour
• 4 Length

The maximum displacement of a vibrating body from its mean position is its:

• 1 Period
• 2 Amplitude
• 3 Wavelength
• 4 Frequency

The SI unit of frequency is the:

• 1 Second
• 2 Metre
• 3 Newton
• 4 Hertz

The distance between two consecutive crests of a wave is its:

• 1 Amplitude
• 2 Frequency
• 3 Period
• 4 Wavelength

A pendulum of length 1 m is made 4 times longer. Its time period becomes:

• 1 Twice
• 2 Four times
• 3 The same
• 4 Half