Physics ECAT Pre Engineering Online Test With Answers

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Physics ECAT Pre Engineering Online Test

Sr. # Questions Answers Choice
1 Sound waves in air always Longitudinal Transverse Stationary Electromagnetic
2 The waves moving from a sitar to a listener in air are Longitudinal progressive Longitudinal stationary Transverse progressive Transverse stationary
3 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>
4 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>
5 Two sound waves of slightly different frequencies propagating in the same direction produce beats due to Interference Diffraction Polarization Refraction
6 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
7 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
8 The velocity of sound is greatest in Water Air Vacuum Metal
9 Velocity of sound in vacuum (in m/s) is 330 1000 156 0
10 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
11 Energy is not carried by Transverse progressive waves Longitudinal vibration Stationary waves Electromagnetic
12 Which one is not produced by sound waves in air? Polarization Diffraction Refraction Reflection
13 Which of the following is the longitudinal waves? Sound waves Waves on plucked string Water waves Light waves
14 Laplace formula is derived from Isothermal change Adiabatic change Isobaric change None of these
15 Which waves are used in sonography? Microwaves Infra red waved Sound waves Ultrasonic waves
16 Mechanical waves on the surface of a liquid are Transverse Longitudinal Torsional both transverse and longitudinal
17 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
18 At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is Sinusoidal shape with amplitude A/3 Sinusoidal shape with amplitude A/2 Sinusoidal shape with amplitude A Straight line
19 With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are Energy, momentum and mass Energy Energy and mass Energy and linear momentum
20 If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be Increasing by a factor of 2 Decreasing by a factor of 2 Decreasing by a factor of 4 Unchanged
21 For production of beats the two sources must have Different frequencies and same amplitude Different frequencies Different frequencies, same amplitude and same phase Different frequencies and same phase
22 The temperature at which the speed of sound becomes double as was at 27°C is 273<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 927<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 1027<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
23 Two sources of sound are said to be coherent if The produce sounds of equal intensity They produce sounds of equal frequency They produce sound waves vibrating with the same phase They produce sound waves with zero or constant phase difference all instant of time
24 When sound waves travel from air to water which of these remains constant? Velocity Frequency Wavelength All the above
25 A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is 50 m/s 20 m/s 40 cm/s 5 cm/s
26 If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity v/A = constant A/v = constant Av = constant None
27 Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is 1/4 times 4 times Twice 1/2 of 8 cm diameter pipe
28 The rain drop falling from the sky reach the ground with Constant terminal velocity Constant gravitational acceleration Variable acceleration acceleration greater than g
29 In case of streamed lined flow of liquid, the loss of energy is Maximum Minimum Infinite equal to what is in turbulent flow
30 Fluids resist force, This property is called Stiffness Strength Ductility Elasticity
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