Mock Test

Sound

by Anish
Updated On:

Sound

Total Questions: 56

21. When the same tune is played on a sitar and a flute the sound produced can be distinguished from each other because of the difference in : [I.A.S. (PRE) 1995]

Correct Answer: (c) quality only.
Solution:Musical sound can differ from each other with the respect to the following three characterised :
1. loudness (intensity)
2. pitch (shrillness)
3. quality (timber)
but the timber is that characterised of a musical sound which enables us to distinguish between two sounds even if they have the same pitch and loudness.

22. The basic units of sound are called : [U.P.P.C.S.(MAINS) 2017]

Correct Answer: (b) phonemes
Solution:Phonemes are the smallest units of sound in a language that can distinguish one word from another. For example, the difference between "cat" and "bat" is determined by the different sounds, "c" and "b", which are phonemes.

23. Assertion (A) : Reverberation mainly feels in large churches and in other large building. [U.P. Lower Sub (pre) 2002,2003]

Reason (R) : The walls, roof and the ground may cause multiple sound reflections.

Correct Answer: (a) both (A) and (R) are true and (R) is the correct explanation of (A).
Solution:Reverberation is a result of multiple reflection . A sound wave in a enclosed or semi-enclosed environment will be broken up as it is bounded back and forth among the reflecting surfaces
Reverberation is an effect which is multiplicity of echoes whose speed of repetition is to be quick for them and to be perceived as separate from one another .

24. Consider the following statement : [I.A.S. (PRE) 2008]

1. A widely used musical scale called diatonic scale has seven frequencies.
2. The frequency of the same Sa is 256 Hz and that of the Ni is 512 Hz.
which of the following statements given above is /are correct ?

Correct Answer: (d) neither 1 nor 2
Solution:The most common musical scale is the distance scale consists of a series of eight notes or tones, and the ratio between the last and the first note is 2 1 is therefore called an octave. The major diatonic scale consists of notes with frequencies in the ratio 1, 9/8, 5/4, 4/3, 3/2, 5/3, 15/8 and 2 relative to a key note. The series of notes is defined as:
C D E F G A B Ci
(Sa) (Re) (Ga) (Ma) (Pa) (Dha) (Ni) (Sa1)
Here, the higher frequency Sa(Sa1) is called the octave of the lower Sa: If the frequency of first note (Sa) is set as 256 Hz. then that of note Ni is 480 Hz (256 *15/8) and the frequency of octave Sa1, is 512 Hz. The above explanation shows that both the given statements are incorrect

25. When the T.V is switched on : [U.P.P.C.S.(pre) 2007]

Correct Answer: (a) audio and video both start simultaneously.
Solution:When the tv is switched on audio and video start immediately in an old models of television audio was heard immediately but the video starts as it needs some warm up time but in modern television audio synchronizer is used to correct this sync error.

26. In television broadcast the picture signals are transmitted by - [R.A.S/R.T.S (PRE) 2012]

Correct Answer: (a) amplitude modulation.
Solution:In a television broadcast the picture signals are transmitted by the amplitude modulation and audio signals are transmitted by frequency modulation.

27. The technique used to transmit audio signal in television broadcast is - [U.P.U.D.A./L.D.A.(spl) (PRE) 2010]

Correct Answer: (b) frequency modulation.
Solution:In a television broadcast the picture signals are transmitted by the amplitude modulation and audio signals are transmitted by frequency modulation.

28. Put in ascending order of speed of sound in the mediums: [U.P.P.C.S.(SPL) (MAINS) 2008]

i. water  ii. steel  iii. nitrogen

Correct Answer: (b) iii, i ,ii
Solution:The speed of the light is different for different type of medium the speed of sound is maximum in solids while minimum in gases the speed of sound depends upon the density of the medium through which it is travelling the medium which has higher density the sound will travel faster in that medium.

29. The sound will have the highest velocity in : [U.P.P.C.S.(pre) 2018]

Correct Answer: (d) steel
Solution:The speed of sound varies from medium to medium sound travels most slowly in gases it travels faster in liquids and fastest in solids for example sound travels at 331 m/s in air it travels at 1531 m/s in iron.

30. The velocity of sound in air is approximately : [42th B.P.S.C. (PRE) 1997]

Correct Answer: (c) 330 m/s
Solution:The speed of sound varies from medium to medium sound travels most slowly in gases it travels faster in liquids and fastest in solids for example sound travels at 331 m/s in air it travels at 1531 m/s in iron.

Anish

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