Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 9

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Question 1
4 / -1

A vessel contains oil (density 0.8 gcm^-3) over mercury (density 13.6 gcm^-3 ). A homogeneous sphere floats with half volume immersed in mercury and the other half in oil. The density of the material of the sphere in gcm^-3 is

A
12.8

B
7.2

C
6.4

D
3.3

Solution
Question 2
4 / -1

If there were no gravity, which of the following will not be there for a fluid?

A
Viscosity

B
Surface tension

C
Pressure

D
Archimedes' upward thrust
Question 3
4 / -1

A ball whose density is 0.4 × 10³ kg m^-3 falls into water from a height of 9 cm. To what depth does the ball sink?

A
9 cm

B
6 cm

C
4.5 cm

D
2.25 cm

Solution
Question 4
4 / -1

At a given place where acceleration due to gravity is gms^-2, a sphere of lead of density d kgm^-3 is gently released in a column of liquid of density ρ kgm^-3. If d > ρ, the sphere will

A
fall vertically with an acceleration gms^-2

B
fall vertically with no acceleration

C
fall vertically with an acceleration

D
fall vertically with an acceleration
Question 5
4 / -1

A glass flask having mass 390 g and an interior volume of 500 cm³ floats on water when it is less than half–filled with water. The density of the material of the flask is

A
0.8 gcc ^-1

B
2.8 gcc ^-1

C
1.8 gcc ^-1

D
0.28 gcc ^-1

Solution
Question 6
4 / -1

Radius of one arm of hydraulic lift is four times of radius of other arm. What force should be applied on narrow arm to lift 100 kg?

A
26.5 N

B
62.5 N

C
6.25 N

D
8.3 N

Solution
Question 7
4 / -1

A rectangular block is 5 cm × 5 cm × 10 cm in size. The block is floating in water with 5 cm side vertical. If it floats with 10 cm side vertical, what change will occur in the level of water?

A
No change

B
It will rise

C
It will fall

D
It may rise or fall depending on the density of block
Question 8
4 / -1

The neck and bottom of a bottle are 3 cm and 15 cm in radius respectively. If the cork is pressed with a force 12 N in the neck of the bottle, then force exerted on the bottom of the bottle is

A
30 N

B
150 N

C
300 N

D
600 N
Question 9
4 / -1

A body floats in water with 40% of its volume outside water. When the same body floats in an oil, 60% of its volume remains outside oil. The relative density of oil is

A
0.9

B
1.0

C
1.2

D
1.5
Question 10
4 / -1

An object weighs m₁ in a liquid of density d₁ and that in liquid of density d₂ is m₂.
The density d of the object is

A

B

C

D