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A) 1 Decibel

B) 5 Decibel

C) 10 Decibel

D) 15 Decibe

A) Whisper

B) Noise

C) Music

D) Shrill

## 43. At 20⁰ the speed of sound is:

A) 300m/s

B) 320m/s

C) 343m/s

D) None of the above

A) Frequency

B) Amplitude

C) Medium

D) Loudness

A) 5104

B) 5050

C) 4040

D)4110

A) Two times

B) Three times

C) Four times

D) Five times

A) 1270m/s

B) 970 m/s

C) 258 m/s

D) 332 m/s

## 48. The speed of sound in air depends on which of the following:

A) Density

B) Compressability

C) Temperature

D) All of the above

## 49. Increase in temperature causes ______ in speed of sound:

A) Decreases

B) Remains Same

C) Increases

D) increases 2 times

A) 310m/s

B)327 m/s

C) 331 m/s

D) 400 m/s

A) 0

B) 0.1 m/s

C) 0.6 m/s

D) 2 m/s

## 52. The Speed of sound is ______ for different frequencies.

A) Similar

B) Different

C) Similar for similar state of matter

D) Cannot be determined

## 53. If the frequency of a wave is doubled, its wavelength is:

A) Remains same

B) Increased

C) Increased 2 times

D) Halved

A) 1 m

B) 0.3m

C) 0.6m

D) 2 m

## 55. Which of the following can occur if a wave front strikes a boundary parallel to the front:

A) Absorption

B) Transmitted

C) Reflection

D) Combination of All the above

A) Diffraction

B) Refraction

C) Reflection

D) Transmission

## 57. Soft curtains are responsible for which of the following:

A) Diffraction of sound

B) Absorption of sound

C) Reflection of sound

D) None of the above

## 58. Multiple reflection of sound is called:

A) Echo

B) Reverberation

C) Proreflection

D) None of the above

## 59. Reverberation causes:

A) Increase in the frequency of sound

B) Improvement of Sound Quality

C) Decrease in pitch of sound

D) Tone to gain in volume

## 60. A reflection of sound that can be distinguished from the original:

A) Reverberation

B) Echo

C) Multiple reflection

D) None of the above