مراجعة عامة | Physics Chapter 3 – موقع الخطة التعليمى

If the cross-sectional area of the tube increases to the double in the steady flow, the volume flow rate………

Increases to the double
Remains constant
Decreases to the quarter
Decreases to the half

The ratio between the mass flow rate and the volume flow rate for a liquid which flows steadily equals……….

The cross-section of the tube
The time of liquid flow
The liquid density
The speed of liquid flow

If the cross-section of the tube increases to the double in the steady flow, then the flow speed………….

Doubles
Decreases to the half
Remains constant
Quadruples

2/3
9/4
3/2

A liquid flows with velocity (V) through a uniform tube, its diameter is (X) and a cork has small aperture is put at one end of this tube. If the diameter of the small aperture is (X/4). The velocity of emergent water from the small aperture =…

a
b
c
d

The opposite figure shows a liquid which is flowing steadily in a tube,

so……..

The ratio between the densities of streamlines at x and at z is less than one
The ratio between the speeds of the liquid at y and at z is less than one
The ratio between the volume flow rates at x and at z is greater than one
The speed of the liquid at z equals

The opposite graph shows the relation between the flow speed (v) and reciprocal of the cross-sectional area (1/A) of the tube for two liquids flow steadily,

Volume flow rates of the two liquids are equals
Mass flow rates of the two liquids are equals
The flow speed of liquid x is three times that of y through the same cross-sectional area
The flow rates of y is double that of x

In the opposite figure the tubes (A) and (B) are different in cross-sectional area and the steady flow rate of the liquid inside them is 0.3 m3/s. The two tubes meet to open in the tube (C) as in figure, then the volume flow rate in the tube (C) is…………

0.1 m3/s
0.6 m3/s
0.9 m3/s
0.3 m3/s

The speed of a steady flow of water in the wide part of a tube is 1.2 m/s and in the narrow part of it is 6 m/s, then the ratio between the diameter of the wide part and the diameter of the narrow part is……

a
b
c
d

The opposite figure shows the graphical relation between the volumes of two different liquids that flow steadily in two different tubes A and B and the time. If the ratio between the densities of the liquids is 2 : 1 respectively, calculate the ratio between the mass flow rates for each of them.

4/1
1/4
1

4
2
1
8

The final velocity of the falling of liquid blood corpuscles in plasma is proportional directly to ……………… of blood corpuscles.

mass
volume
density
all

The sedimentation rate increases in patients with.

animea
rheumatic fever
caugh
no correct answer

Rate of sedimentation test is an application of :

capillarity
viscosity
surface tension
rate flow

A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by diagram…………….

a
b
c
d

In the high speeds of a car, the air resistance due to its viscosity is………

Directly proportional to the speed of the car
Inversely proportional to the speed of the car
Directly proportional to square the speed of the car
Inversely proportional to square the speed of the car

When the temperature of a liquid decreases, its viscosity coefficient………

Increases
Decreases
Does not change
Cannot be determined without knowing the type of liquid

If the speed difference between two liquid layers decreased when a tangential force acted on the upper layer then the viscosity coefficient…………

Vanishes
Decreases
Increases
Remains constant

The resistance of liquids to the motion of objects inside them is a result of……….

The liquid density
The liquid viscosity
The pressure inside the liquid
The motion of the liquids from point to another

a
b
c
d

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