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 Drag force increases if speed of the object moving through the fluid: Increases Decreases Remains constant None of these
2 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
3 At high speed, fluid friction _____ and fuel consumption ___,: Increases, decreases Increases, increases Decreases, increases None of these
4 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
5 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
6 The _____ viscous the medium is _____, is the value of terminal velocity of the droplet: More, lesser Lesser, more Both A and B Lesser, lesser
7 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
8 A massive object falls through a fluid: Faster Slower Slowest None
9 High speed meteors rushing through air reduces to ashes because of: Force of gravity High resistance of air Drag force None of these
10 Stock's law holds for: Motion through free space Motion through viscous medium Bodies of all shapes None of these
11 Viscosity of water is ______ that of air but ___ that of plasma. More, more Less, more Less, less More, less
12 Fluid friction is _____ the friction between two solid surfaces: Greater than Smaller than Equal to None of these
13 Density of fluid is defined as: Its volume to mass ratio Product of volume and mass Its mass of volume ratio None of these
14 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
15 Glycerin has viscosity _____ the viscosity of water: More than Equal to Less than None of these
16 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
17 N s m-2is unit of: Drag force Pressure Surface tension Coefficient of viscosity
18 Machine parts are jammed due to: Increasing in viscosity of lubricant Decreasing in viscosity of lubricant Decreasing in surface tension of lubricant None of these
19 The body passing a viscous medium affected by: One force only Two forces only Four forces None of these
20 The resistance offered by a fluid to a solid moving inside it is called: Drag force Surface force Viscosity None of these
21 The property of fluids due to which they resist their own flow is called: Drag force Surface tension Viscosity None of these
22 In case of planets, the necessary acceleration is provided by: Gravitational force Coulomb force Frictional force None of these
23 A body can have constant velocity when it follows: A circular path A rectilinear path Trajectory of a projectile None of these
24 The instantaneous acceleration of a body moving with constant speed in a circle: Remains constant Is called centripetal acceleration Tangential acceleration None of these
25 When a body moves with a constant speed in a circle: No work is done on it No acceleration is produced in the body Velocity remains constant None of these
26 When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to: Zero Its average velocity Its angular displacement None of these
27 The angular speed of a particle moving along a circular path is 5 Pie rad sec-1, Its period of motion is: 2.5 sec 0.06 sec 15.7 sec 0.4 sec
28 Angular velocity is a: Scalar quantity Vector quantity Complex quantity None of these
29 Circular motion is an example of motion in: One dimension Two dimensions Three dimensions None of these
30 The useful unit of the angular displacement in SI unit is: Degree Revolution Radian Metre
Download This Set

Is this page helpful?