ECAT Pre Engineering Physics Chapter 6 online mcq test with answers for chapter 6 (Fluid Dynamics)

Physics ECAT Pre Engineering Chapter 6 Fluid Dynamics Online Test

Sr. #	Questions	Answers Choice
1	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
2	The study of fluid in motion basically involves law of conservation of:	Mass Energy Change Both A and C Both A and B
3	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
4	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>
5	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
6	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
7	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
8	Stoke;s law is not applicable when the speed of the object moving through a fluid is:	Zero Small Large None of these
9	Drag force increases if speed of the object moving through the fluid:	Increases Decreases Remains constant None of these
10	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
11	At high speed, fluid friction _____ and fuel consumption ___,:	Increases, decreases Increases, increases Decreases, increases None of these
12	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
13	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
14	The _____ viscous the medium is _____, is the value of terminal velocity of the droplet:	More, lesser Lesser, more Both A and B Lesser, lesser
15	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

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