ECAT Physics Online Test With Answers

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Longitudinal waves are also called: Congressional waves Transverse waves Radio waves None of them
2 Which of the following is not mechanical wave? Sound wave Light wave <div>wave produced in spring</div> None of them
3 When a wave is travels from one place to another, it transfers: Matter Energy Momentum Both B and C
4 Which of the following is/are example/s if mechanical waves i.e. waves generated in _______: Rope Coil of spring Water All of them
5 The waves which propagate out in the space due to oscillations of electric and magnetic fields are called: Mechanical waves Electromagnetic waves Matter waves All of them
6 The waves which propagate through the oscillations of material particles are known as: Mechanical waves Electromagnetic waves Any of them None of them
7 In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other. Streamline, cannot Turbulent, cannot Streamline, can None of these
8 The study of fluid in motion basically involves law of conservation of: Mass Energy Change Both A and C Both A and B
9 The drag force acting on a spherical droplet of radius 10-5m moving with a velocity of 1 cm/sec in a fluid of velocity 5.31 x 10-7m/sec. The units comes out to be: 10<sup>-16</sup>N 10<sup>-14</sup>N 10<sup>-12</sup>N 10<sup>-10</sup>N
10 The dimensions of viscosity are: M<sup>2</sup>L<sup>-1</sup>T<sup>-2</sup> M<sup>-1</sup>L<sup>1</sup>T<sup>-1</sup> M<sup>-1</sup>L<sup>-1</sup>T ML<sup>-1</sup>T<sup>-1</sup>
11 The unit of viscosity is SI system is: Kg<sup>-1</sup>m sec<sup>-1</sup> Kgm<sup>-1</sup> sec<sup>-1</sup> Kg<sup>-1</sup>m<sup>-1</sup> sec None of these
12 When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity: Starts increasing Starts decreasing Becomes constant Is called escape velocity
13 0.10 cm can be written as: 1.0 x 10<sup>-2</sup>m 1.0 x 10<sup>-3</sup>cm 1.0 x 10<sup>-4</sup>cm 1. x 10<sup>-4</sup>m
14 Stoke;s law is not applicable when the speed of the object moving through a fluid is: Zero Small Large None of these
15 Drag force increases if speed of the object moving through the fluid: Increases Decreases Remains constant None of these
16 Fog droplets are suspended in air when their weight is balanced by: Force of gravity Upward trust due to air Surface tension None of these
17 At high speed, fluid friction _____ and fuel consumption ___,: Increases, decreases Increases, increases Decreases, increases None of these
18 Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is: Not affected due to its size Twice that of small size ball Four times that of small size ball 1/4th of that of small size ball
19 When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is: F<sub>D</sub>-mg Zero mg-F<sub>D</sub> None of these
20 The _____ viscous the medium is _____, is the value of terminal velocity of the droplet: More, lesser Lesser, more Both A and B Lesser, lesser
21 Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet: Is smaller than Is greater than Becomes equal to None of these
22 A massive object falls through a fluid: Faster Slower Slowest None
23 High speed meteors rushing through air reduces to ashes because of: Force of gravity High resistance of air Drag force None of these
24 Stock's law holds for: Motion through free space Motion through viscous medium Bodies of all shapes None of these
25 Viscosity of water is ______ that of air but ___ that of plasma. More, more Less, more Less, less More, less
26 Fluid friction is _____ the friction between two solid surfaces: Greater than Smaller than Equal to None of these
27 Density of fluid is defined as: Its volume to mass ratio Product of volume and mass Its mass of volume ratio None of these
28 Unit of viscosity is: Kg m<sup>-1</sup>sec<sup>-1</sup> N s m<sup>-2</sup> J s m<sup>-3</sup> All of these
29 Glycerin has viscosity _____ the viscosity of water: More than Equal to Less than None of these
30 A body is moving through a viscous medium eventually comes to rest because of: Force of gravity Force of friction Its weight Both A and C
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