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01) Velocity of sound depends upon following characteristics of medium.

Answer:   temperature

02) A body in __________ produces sound.

Answer:   vibration

03) The sound waves in air are ________.

Answer:   longitudinal waves

04) When sound wave travels from air to denser medium its _________ is not changed.

Answer:   frequency

05) When moisture increases in atmosphere, velocity of sound wave ___________.

Answer:   increases

06) When temperature of atmosphere reduces, velocity of sound wave ___________.

Answer:   rarefaction

07) Sound waves propagating in medium by _________ and _________.

Answer:   Inductor and compression

08) Velocity of sound waves in a medium depends on ________ and _________.

Answer:   Elasticity and density

09) A wave has frequency 10 Hz, find its periodic time.

Answer:   0.1 second

10) Mechanical waves propagats in __________.

Answer:   medium

11) A tunning fork vibrates 256 times per second. If velocity of sound in medium is 330 m/s, find the wavelength of the wave produced by the tunning fork ____________.

Answer:   1.29 m

12) At what temperature velocity of sound will be doubled than velocity at 0°C.

Answer:   1092 K

13) Waves travelling on a string is called __________.

Answer:   mechanical transverse waves

14) A bombblast is done on moon, it's sound on earth _________.

Answer:   is not heard

15) The distance travelled by wave in a periodic time is ________.

Answer:   equal to wavelength

16) The ratio of wavelength in two sound waves propagationg in a medium is 1 : 8, what will be ratio of their velocities.

Answer:   1 : 1

17) A wave propagating in a medium has wavelength 20 m and velocity 40 `cm^{-1}`. The same wave propagates in other medium with wavelength 30 cm, Find the velocity of the wave in second medium.

Answer:   60 `cms^{-1}`

18) According to newton propagation of sound in air is __________.

Answer:   isothermal

19) According to Laplace's propagation of sound in gas is __________.

Answer:   adiabatic

20) Experimentally velocity of sound in air is _______ `ms^{-1}`.

Answer:   320

21) Velocity of sound wave in gas is proportional to _________ of elasticity.

Answer:   squareroot

22) In which medium, sound velocity is maximum ?

Answer:   air

23) Give the name of equation which gives displacement of particle at any time.

Answer:   Wave equation

24) For stationary waves, the ________ of wave should be same of the waves travelling in different direction.

Answer:   amplitude, wave length and frequency

25) What is the distance between consecutive nodes and antinodes ?

Answer:   `\lambda/4`

26) The velocity of light in medium is ________ the refractive index of the medium.

Answer:    inversely proportional

27) Imposement of light waves on each other is called.

Answer:   interferrence

28) What light enters the water from glass its velocity ___________.

Answer:   increases

29) Snell's law is ___________.

Answer:   `\frac{sin i}{sin r}` = constant

30) Unit of focal power of lens is ___________.

Answer:   diptor

31) Distance of distinct vision is _________.

Answer:   25cm

32) In an optical fiber communication system, which among the following is not a typical transmitter function?

Answer:   Recoding to match output standard

33) Which among the following is provided by an optical receiver for the regeneration of data signal with minimum error?

Answer:    Linear Circuitry

34) For a sine wave, the frequency is represented by the cycles per ______

Answer:   Second

35) Which property/ies of PCM stream determine/s the fidelity to original analog signal?

Answer:   Sampling rate, Bit depth

36) In single-mode fibers, how does the fraction of energy traveling through bound mode appear in the cladding?

Answer:   As an evanescent wave

37) What is the typical value of refractive index for an ethyl alcohol?

Answer:   1.36

38) If a light travels in a certain medium and it gets reflected off an optically denser medium with high refractive index, then it is regarded as ______.

Answer:   External Reflection

39) In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of _________.

Answer:    Light Collection

40) Which among the following do/does not support/s the soot formation process?

Answer:   PCVD

41) Which type of photonic crystal fiber exhibit/s its/their similarity to the periodic crystalline lattice in a semiconductor?

Answer:   Photonic bandgap fiber

42) Which type of fiber optic cable has/have its/their core with the size of about 480 μm to 980 μm & made up of polymethylmethacrylate (PMMA)?

Answer:    Plastic fiber optic cable

43) In multifiber cable system, which form of outer jacket/s consist/s of polyolefin compounds and are regarded as halogen free?

Answer:   LSZH

44) During the design of FOC system, which among the following reasons is/are responsible for an extrinsic absorption?

Answer:    Impurity atoms in glass material

45) Which among the following represent/s the measure/s to minimize the inhomogenities for Mie scattering reduction?

Answer:   Extrusion Control, Increase in relative R.I. difference, Removal of imperfections due to glass manufacturing process