TEST SERIES - 62 (II)

Stationary waves are so called because in them

• The particles of the medium are not disturbed at all

• The particles of the medium do not execute SHM

• These occurs no flow of energy

• The interference effect can’t be observed

Some common mediums in which speed of sound waves is measured at mentioned below: 1. Air 2. Steel 3. Copper 4. Water What is the correct increasing order of the speed of sound?

• 1 < 4 < 2 < 3

• 4 < 1 < 2 < 3

• 1 < 4 < 3 < 2

• 4 < 1 < 3 < 2

Which one of the following is the correct sequence of wavelengths of radiations?

• UV > Green > IR > Hard X-rays

• IR > Green > UV > Hard X-rays

• UV > Hard X-rays > IR > Green

• IR > Hard X-rays > Green > UV

An echo will be heard if the minimum distance between the source of sound and obstacle is

• 1 m

• 10 m

• 15 m

• 17 m

The audible frequency range of a human ear is

• 20 hertz to 200 hertz

• 2 hertz to 20 hertz

• 200 hertz to 2000 hertz

• 20 hertz to 20000 hertz

The temperature at which the speed of sound in air becomes double its value of 0°C is

• 1092°C

• 189 K

• 819°C

• 546° C

The technique used to transmit audio signal in television broadcasts is

• Amplitude modulation

• Frequency modulation

• Pulse code modulation

• Time division multiplexing

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

• Pitch, loudness and quality

• Pitch and loudness

• Quality only

• Loudness only

What frequency range of E.M. waves are used for commercial FM radio?

• 88 MHz to 108 MHz

• 88 kHz to 108 kHz

• 88 GHz to 108 GHz

• None of the above

Match List-I (Frequency range) with List-II (Uses) and select the correct answer:

• 54 MHz to 890 MHz

• FM radio

• 88 MHz to 108 MHz

• Short wave

• 300 MHz to 30,000 MHz

• Television waves

• 1710 kHz to 54 MHz

• UHF band