Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Which waves are used in sonography? Microwaves Infra red waved Sound waves Ultrasonic waves
2 Mechanical waves on the surface of a liquid are Transverse Longitudinal Torsional both transverse and longitudinal
3 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
4 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
5 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
6 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
7 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
8 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>
9 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
10 When sound waves travel from air to water which of these remains constant? Velocity Frequency Wavelength All the above
11 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
12 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
13 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
14 The rain drop falling from the sky reach the ground with Constant terminal velocity Constant gravitational acceleration Variable acceleration acceleration greater than g
15 In case of streamed lined flow of liquid, the loss of energy is Maximum Minimum Infinite equal to what is in turbulent flow
16 Fluids resist force, This property is called Stiffness Strength Ductility Elasticity
17 The fluid which is incompressible and non viscous is called Ideal fluid Non-ideal fluid Prefect fluid All
18 The electrical forces between the molecules of a liquid are Repulsive Attractive Both A and B None
19 A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that water contains hydrogen atoms, air does not water molecules are smaller than molecules in the air water molecules are smaller than molecules in the air surface tension of the water prevents it from
20 If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm2will be 1 cm 2 cm 8 cm None
21 When the velocity of a liquid flowing steadily in a tube increases, its pressure? Decreases Increases Remains same Zero
22 Fire fighters have jet attached to the head of their water pipes in order to Increase the mass of water flowing per second Increase the velocity of water flowing out Increase the volume of water flowing per second Avoid wastage of water
23 Deep water almost runs still when surface water flow in rivers. What does it explains Magnus effect Equation of continuity Surface energy Bernoulli's equation
24 Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to Increase the mass of water flowing per second Avoid wastage of water Increase the velocity of water flowing out Increase the volume of water flowing per second
25 Surface tension of water is reduced by adding Detergents Camphor Plastic Both A and B
26 Bernoulli's equation is based upon law of conversation of mass momentum Energy None
27 A flowing liquid possess K.E P.E Pressure Energy All
28 The force exerted by the fluid in a hydraulic pump on the piston is 10 cm2, the fluid pressure on the piston is, in N/cm2 20 200 2000 20,000
29 The density of water is 103kg/m3. The water pressure on a submarine is 2.0 x 107N/m2. The depth of the submarine below the surface of the water, in maters, is approximately 200 m 11000 m 2000 m 8000 m
30 The term Brownian movement refers to irregular motions of small particles suspended in a fluid convection currents in a liquid or gas convection currents in a gas but not in a liquid the stretching of a body beyond its elastic limit
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