Fluid Statics and Dynamics MCQs

Question 1

A jet from a squeezed hose reaches further because:

Accepted Answer

the water leaves at a higher speed

Answer

the water is lighter

Answer

gravity is weaker

Answer

air resistance is removed

Question 2

A perfume atomiser (spray) works because:

Accepted Answer

fast air over the tube lowers the pressure, so the liquid is pushed up and sprayed

Answer

the liquid is heated

Answer

gravity pushes it up

Answer

the bottle is compressed

Question 3

A loaded barge displaces 200 m^3 of fresh water (1000 kg/m^3). Its total mass is:

Accepted Answer

2 10^5 kg

Answer

200 kg

Answer

2 10^3 kg

Answer

1.96 10^6 kg

Question 4

A block of density 250 kg/m^3 floats in a liquid of density 1000 kg/m^3. The fraction of its volume below the surface is:

Accepted Answer

0.25

Answer

0.125

Answer

4

Answer

0.75

Question 5

Torricelli's theorem says that liquid flows from a hole at depth h with the speed:

Accepted Answer

of a body falling freely through height h

Answer

of sound

Answer

independent of h

Answer

zero

Question 6

A gas in a pipe is heated so its density halves at a section of the same area. To keep the mass flow, its speed must:

Accepted Answer

double

Answer

halve

Answer

quadruple

Answer

stay the same

Question 7

Water flows at 3 m/s through a pipe section of area 0.02 m^2 into a section of area 0.005 m^2. Its speed there is:

Accepted Answer

12 m/s

Answer

0.75 m/s

Answer

6 m/s

Answer

24 m/s

Question 8

The mass flow rate has the unit:

Accepted Answer

kg/s

Answer

m^3/s

Answer

N/s

Answer

kg/m^3

Question 9

In a Venturi tube, the pressure is lowest at:

Accepted Answer

the narrowest section

Answer

the entrance

Answer

everywhere equal

Answer

the widest section

Question 10

Which of these would NOT be true of a superfluid?

Accepted Answer

It slows down a stirred spoon quickly

Answer

It has zero viscosity

Answer

Its vortices persist

Answer

It can climb container walls

Question 11

Water in a pipe of radius 2 cm flows at 0.5 m/s. At a nozzle of radius 0.5 cm, it flows at:

Accepted Answer

8 m/s

Answer

2 m/s

Answer

0.125 m/s

Answer

4 m/s

Question 12

The Bernoulli effect follows from:

Accepted Answer

conservation of energy applied to a moving fluid

Answer

Hooke's law

Answer

conservation of charge

Answer

Archimedes' principle

Question 13

Ship hulls are wide at the waterline to:

Accepted Answer

increase stability against rolling

Answer

reduce displacement

Answer

reduce upthrust

Answer

make the ship heavier

Question 14

A ship sails from the sea into a river. To keep the same weight floating it must:

Accepted Answer

displace a larger volume of water

Answer

go faster

Answer

displace less water

Answer

lose mass

Question 15

In Bernoulli's equation, the term 12rho v^2 represents:

Accepted Answer

kinetic energy per unit volume (dynamic pressure)

Answer

potential energy per unit volume

Answer

the static pressure

Answer

the mass flow rate

Question 16

The stream from a tap narrows as it falls because:

Accepted Answer

gravity speeds the water up, so the area must shrink

Answer

the water evaporates

Answer

surface tension makes it heavier

Answer

air pressure increases

Question 17

When cargo is loaded on a floating ship, the ship:

Accepted Answer

sinks lower, displacing more water

Answer

sinks completely

Answer

stays at the same level

Answer

rises higher

Question 18

When air speeds up over the top of a curved paper sheet, the sheet:

Accepted Answer

is lifted

Answer

is pushed down

Answer

spins

Answer

stays at rest

Question 19

Water flows at 2 m/s through a pipe section of area 4 m^2 into a section of area 1 m^2. Its speed there is:

Accepted Answer

8 m/s

Answer

0.5 m/s

Answer

16 m/s

Answer

4 m/s

Question 20

Liquids are usually treated as incompressible because:

Accepted Answer

their density changes very little under pressure

Answer

they have no mass

Answer

they are viscous

Answer

they always flow turbulently

Question 21

An ideal fluid is assumed to be:

Accepted Answer

incompressible, non-viscous and in steady flow

Answer

turbulent and viscous

Answer

compressible and viscous

Answer

a gas only

Question 22

Two ships moving side by side close together tend to:

Accepted Answer

be pushed towards each other

Answer

rise out of the water

Answer

slow down to stop

Answer

move apart

Question 23

In a superfluid, kinetic energy of flow is:

Accepted Answer

not lost to internal friction

Answer

always zero

Answer

quickly converted to heat

Answer

negative

Question 24

A 'streamlined' car shape is designed to:

Accepted Answer

keep air flow smooth and reduce drag

Answer

increase weight

Answer

add friction

Answer

increase turbulence

Question 25

Streamlines in steady flow:

Accepted Answer

never cross each other

Answer

always cross

Answer

form closed loops only

Answer

are random

Fluid Statics and Dynamics MCQs — Physics (page 5)

101. A jet from a squeezed hose reaches further because:

102. A perfume atomiser (spray) works because:

103. A loaded barge displaces 200 m^3 of fresh water (1000 kg/m^3). Its total mass is:

104. A block of density 250 kg/m^3 floats in a liquid of density 1000 kg/m^3. The fraction of its volume below the surface is:

105. Torricelli's theorem says that liquid flows from a hole at depth h with the speed:

106. A gas in a pipe is heated so its density halves at a section of the same area. To keep the mass flow, its speed must:

107. Water flows at 3 m/s through a pipe section of area 0.02 m^2 into a section of area 0.005 m^2. Its speed there is:

108. The mass flow rate has the unit:

109. In a Venturi tube, the pressure is lowest at:

110. Which of these would NOT be true of a superfluid?

111. Water in a pipe of radius 2 cm flows at 0.5 m/s. At a nozzle of radius 0.5 cm, it flows at:

112. The Bernoulli effect follows from:

113. Ship hulls are wide at the waterline to:

114. A ship sails from the sea into a river. To keep the same weight floating it must:

115. In Bernoulli's equation, the term 12rho v^2 represents:

116. The stream from a tap narrows as it falls because:

117. When cargo is loaded on a floating ship, the ship:

118. When air speeds up over the top of a curved paper sheet, the sheet:

119. Water flows at 2 m/s through a pipe section of area 4 m^2 into a section of area 1 m^2. Its speed there is:

120. Liquids are usually treated as incompressible because:

121. An ideal fluid is assumed to be:

122. Two ships moving side by side close together tend to:

123. In a superfluid, kinetic energy of flow is:

124. A 'streamlined' car shape is designed to:

125. Streamlines in steady flow:

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