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Physics — Second Secondary

Physics — Second Secondary

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Physics — Second Secondary 2026/2027

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Question bank: Chapter 4: Hydrodynamics

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  • Questions count: 40
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1.
Fluids include:
liquids only
gases only
liquids and gases
solids and liquids
2.
Which statement is correct?
Liquids are easily compressed, gases are not
Gases are easily compressed, liquids are almost incompressible
Both are incompressible
Both are easily compressed
3.
The SI unit of density is:
kg/m
kg/m2
kg/m3
N/m3
4.
The dimensional formula of density is:
ML3
ML−3
ML−2
M−1L3
5.
A liquid of mass 0.4 kg occupies 0.0005 m3. Its density is:
200 kg/m3
800 kg/m3
1250 kg/m3
2000 kg/m3
6.
The mass of 2 m3 of oil of density 800 kg/m3 is:
400 kg
800 kg
1600 kg
3200 kg
7.
Relative density:
has the unit kg/m3
has the unit g/cm3
has no unit
has the unit N
8.
Relative density of a substance is its density divided by the density of water at:
0 °C
4 °C
20 °C
100 °C
9.
The density of mercury is 13 600 kg/m3. Its relative density is:
1.36
13.6
136
13 600
10.
When a car battery discharges, the density of the electrolyte:
increases
decreases
stays the same
becomes zero
11.
The normal density of human blood is about:
500 kg/m3
1050 kg/m3
2500 kg/m3
13 600 kg/m3
12.
A blood density lower than normal may indicate:
a higher concentration of blood cells
a lower concentration of blood cells (anaemia)
high pressure
a normal state
13.
Gold of 14 carat is less dense than pure gold because:
gold is lighter when heated
it is mixed with lighter metals
its volume is smaller
it contains water
14.
In laminar flow:
layers mix with eddies
layers slide smoothly over each other
the liquid is at rest
the flow is always noisy
15.
Streamlines in laminar flow:
intersect at the narrowest point
never intersect
always are parallel and equally spaced
are circular
16.
Where streamlines are close together, the speed of the liquid is:
low
zero
high
the same as elsewhere
17.
The tangent to a streamline at a point gives the direction of the:
pressure
instantaneous velocity of the liquid there
viscosity
density
18.
Turbulent flow occurs when the speed of the liquid:
is very small
exceeds a certain limit
is zero
is uniform
19.
Which is NOT a condition of steady flow in a pipe?
The liquid completely fills the pipe
The amount entering equals the amount leaving in the same time
The velocity at every point is constant in time
The velocity is the same at all points of the pipe
20.
The volume flow rate Qv is equal to:
ρAv
Av
A/v
v/A
21.
The unit of mass flow rate is:
m3/s
kg/s
kg/m3
N·s
22.
The continuity equation expresses the law of conservation of:
energy
momentum
mass
charge
23.
Water flows through a pipe of cross-section 8 cm2 at 3 m/s into a section of 2 cm2. The speed there is:
0.75 m/s
6 m/s
12 m/s
24 m/s
24.
The radius of a pipe is halved. The speed of the water (same flow rate) becomes:
half
doubled
four times
one quarter
25.
The diameter of a pipe is doubled. For the same flow rate, the speed becomes:
double
half
one quarter
four times
26.
A volume flow rate of 0.004 m3/s passes through a section of area 2 cm2. The speed of water is:
2 m/s
8 m/s
20 m/s
200 m/s
27.
A pipe of cross-section 2 × 10−4 m2 carries water at 3 m/s. The volume flowing in 10 s is:
6 × 10−4 m3
6 × 10−3 m3
0.6 m3
6 m3
28.
The mass of water (1000 kg/m3) flowing in 10 s in the previous situation is:
6 g
0.6 kg
6 kg
60 kg
29.
In the narrowest part of a pipe carrying a steady flow, the liquid speed is:
the smallest
the largest
zero
the same as the widest part
30.
Blood flows slowest in the capillaries mainly because:
the capillaries are the longest vessels
their total cross-sectional area is the largest
blood is thicker there
the heart is far away
31.
According to Bernoulli's principle, where the speed of a fluid increases its pressure:
increases
decreases
stays the same
becomes zero
32.
The air above an aeroplane wing moves faster than the air below it, so the pressure above is:
greater than below
equal to that below
smaller than below, producing a lift
zero
33.
Viscosity is the property that causes:
the liquid to be compressed
resistance between layers of the fluid hindering their sliding
the liquid to evaporate
a rise in boiling point
34.
Which of the following has the highest viscosity?
Alcohol
Water
Honey
Petrol
35.
The SI unit of the coefficient of viscosity is:
N/m2
N·s/m2
N·m
kg/m3
36.
The dimensional formula of the coefficient of viscosity is:
MLT−2
ML−1T−1
ML−1T−2
ML2T−1
37.
In the two-plate model, the force needed to keep the upper plate moving at constant speed is directly proportional to all EXCEPT:
the area of the plate
the speed of the plate
the coefficient of viscosity
the distance between the plates
38.
If the distance between the plates is doubled (same A, v, η) the force becomes:
double
half
four times
unchanged
39.
The coefficient of viscosity of a pure liquid depends on:
its type and temperature
the size of the container
the speed of the plate
the area of the plate
40.
In anaemia the blood sedimentation rate is:
higher than normal because red cells stick together
lower than normal because red cells break down and become smaller
unchanged
zero
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