ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 The velocity of sound in air depends upon Density and elasticity of gas Pressure Wavelength Amplitude and frequency of sound
2 In stationary waves Energy is uniformly distributed Energy is minimum at nodes and maximum at antinodes Energy is maximum at nodes and minimum at antidotes Alternating maximum and minimum energy producing at nodes and antinodes
3 When temperature increase, the frequency of a tuning fork Increases Decreases Remains same Increase or decreases depending on the material
4 If a wave can be polarized, it must be An electromagnetic wave A longitudinal wave A progressive wave A transverse wave
5 Which one of the following could be the frequency of ultraviolet radiation? 1.0 x 10<sup>6</sup>Hz 1.0 x 10<sup>9</sup>Hz 1.0 x 10<sup>12</sup>Hz 1.0 x 10<sup>15</sup>Hz
6 The principle of superposition states that The total displacement due to several waves is the sum of the displacement due to those waves acting individually Two stationary waves superimpose to give two progressive waves A diffraction pattern consists of many interference patterns superimposed on one another Two progressive waves superimpose to give a stationary wave
7 Ultra-violet rays differ from X-rays in that they Cannot be diffracted Cannot be polarized Have a lower frequency Are deviated when they pass through a magnetic field
8 Progressive waves of frequency 300 Hz are superimposed in produced a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves? 100 ms<sup>-1</sup> 200 ms<sup>-1</sup> 450 ms<sup>-1</sup> 900 ms<sup>-1</sup>
9 Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse? 10<sup>3</sup> 10<sup>6</sup> 10<sup>9</sup> 10<sup>12</sup>
10 There is no net transfer of energy by particle of medium in Longitudinal wave Transverse wave Progressive wave Stationary wave
11 Through which character we can distinguish the light waves from sound waves Interference Refraction Polarization Reflection
12 Decibel is unit of Intensity of light x-ray radiation capacity sound loudness Energy of radiation
13 A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is 2 m 1 m 0.5 m 4 m
14 Sound waves in air always Longitudinal Transverse Stationary Electromagnetic
15 The waves moving from a sitar to a listener in air are Longitudinal progressive Longitudinal stationary Transverse progressive Transverse stationary
16 The velocity of sound at same temperature is maximum in H<sub>2</sub> N<sub>2</sub> O<sub>2</sub> NH<sub>3</sub>
17 It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be 60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
18 Two sound waves of slightly different frequencies propagating in the same direction produce beats due to Interference Diffraction Polarization Refraction
19 When two progressive waves of nearly same frequencies superimpose and give rise to beats, then Frequency of beat changes with time Frequency of beat changes with location of observer All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves
20 In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is Same 2 times 4 times 8 times
21 The velocity of sound is greatest in Water Air Vacuum Metal
22 Velocity of sound in vacuum (in m/s) is 330 1000 156 0
23 What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m? 1 MHz 10 Hz 1 GHz 100000 Hz
24 Energy is not carried by Transverse progressive waves Longitudinal vibration Stationary waves Electromagnetic
25 Which one is not produced by sound waves in air? Polarization Diffraction Refraction Reflection
26 Which of the following is the longitudinal waves? Sound waves Waves on plucked string Water waves Light waves
27 Laplace formula is derived from Isothermal change Adiabatic change Isobaric change None of these
28 Which waves are used in sonography? Microwaves Infra red waved Sound waves Ultrasonic waves
29 Mechanical waves on the surface of a liquid are Transverse Longitudinal Torsional both transverse and longitudinal
30 Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity? 400 m/sec 40 m/sec 430 m/sec 300 m/sec
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