ECAT Pre General Science Physics Chapter 6 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 6 Fluid Dynamics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 6 Fluid Dynamics

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ECAT Pre General Science Physics Chapter 6 Fluid Dynamics

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Question # 1

Fog droplets are suspended in air when their weight is balanced by:

Question # 2

A device used to measure the speed of liquid flow is known as

Question # 3

The electrical forces between the molecules of a liquid are

Question # 4

Bernoulli's equation is based upon law of conservation

Question # 5

The pressure will be low where the speed of the fluid is

Question # 6

Fire fighters have jet attached to the head of their water pipes in order to

Question # 7

Blood pressure is measured in torr. Which of the following units could belong to torr?

Question # 8

In a surface tension experiment with a capillary tube water rises up to 0.1 m. if the same experiment is repeated on an artificial satellite, which is resolving around the earth, water will rise in the capillary tube up to a height of

Question # 9

Drag force increases if speed of the object moving through the fluid:

Question # 10

Surface tension of water is due to

Question # 11

When each particle of the fluid moves along a smoth path, this path is known as

Question # 12

A water hose with an internal diameter of 20 mm at the outlet discharges 30 kg of water in 60 s. What is water speed at the outlet if density of water is 1000 kg/m3during its steady flow

Question # 13

The irregular and unsteady flow of the fluid is called

Question # 14

In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.

Question # 15

Under normal circumstances, the volume of blood is sufficient to keep the vessels

Question # 16

The body passing a viscous medium affected by:

Question # 17

Substances that flow easily have

Question # 18

Bernoulli's equation is applicable for

Question # 19

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

Question # 20

Fluid friction is _____ the friction between two solid surfaces:

Question # 21

Viscosity is defined as

Question # 22

The term Brownian movement refers to

Question # 23

When a fluid is in motion, its flow can be considered as

Question # 24

In a normal healthy person the value of diastolic pressure is

Question # 25

At the starting point of the free fall motion of an object, its acceleration will be

Question # 26

The velocity gained by the fluid in falling through the distance (h1 - h2) under the action of gravity is equal to the speed of the action of gravity is equal to the speed of the

Question # 27

The body will move with terminal velocity when it acquires

Question # 28

How much force is required to slide one layer of the liquid over the other layer is measured by

Question # 29

Liquids and gasses have

Question # 30

According to Stoke's law, drag force depends on

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ECAT Physics Chapter 6 Important MCQ's

Sr.# Question Answer
1 Fire fighters have jet attached to the head of their water pipes in order to
A. Increase the mass of water flowing per second
B. Increase the velocity of water flowing out
C. Increase the volume of water flowing per second
D. Avoid wastage of water
2 When a water droplet falls through air, the net force on it is
A. Net force = drag force - weight
B. Net force = weight - drag force
C. Net force = drag force + weight
D. Net force = weight + drag force
3 Surface tension of water is due to
A. Inter molecular attractions
B. Inter molecular spaces
C. Inter molecular repulsion
D. None of above
4 When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:
A. Starts increasing
B. Starts decreasing
C. Becomes constant
D. Is called escape velocity
5 The terminal velocity of water droplet of radius 1 x 10-4m and desity 1000 kg m-3descending through air of viscosity 19 x 10-6kg. m-1 s-1 is
A. 2.5 ms-1
B. 3.2 ms-1
C. 4.3 ms-1
D. 1.1 ms-1
6 The effect of friction between different layers of a flowing fluid is described in terms of
A. motion of fluid
B. nature of fluid
C. colour of fluid
D. viscosity of fluid
7 In case of streamed lined flow of liquid, the loss of energy is
A. Maximum
B. Minimum
C. Infinite
D. equal to what is in turbulent flow
8 When each particle of the fluid moves along a smoth path, this path is known as
A. straight path
B. smooth path
C. haphazard path
D. steamline
9 In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.
A. Streamline, cannot
B. Turbulent, cannot
C. Streamline, can
D. None of these
10 Machine parts are jammed due to:
A. Increasing in viscosity of lubricant
B. Decreasing in viscosity of lubricant
C. Decreasing in surface tension of lubricant
D. None of these

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