Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 77

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Question 1
4 / -1

Two solids A and B float in water. It is observed that A floats with 1/2 of its body immersed in water and B floats with 1/4 of its volume above the water level. The ratio of the density of A to that of B is

A
4 : 3

B
2 : 3

C
3 : 4

D
1 : 2

Solution
Question 2
4 / -1

A man is carrying a block of a certain substance (of density 1000 kgm^–3) weighing 1 kg in his left hand and a bucket filled with water and weighing 10 kg in his right hand. He drops the block into the bucket. How much load does he carry in his right hand now ?

A
9 kg

B
10 kg

C
11 kg

D
12 kg
Question 3
4 / -1

A candle of diameter d is floating on a liquid in a cylindrical container of diameter D [D >> d] as shown in figure. If it is burning at the rate of 2cm/hour then the top of the candle will

A
Remain at the same height

B
Fall at the rate of 1 cm/hour

C
Fall at the rate of 2 cm/hour

D
Go up the rate of 1 cm/hour
Question 4
4 / -1

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water ?

A

B

C

D

Solution
Question 5
4 / -1

An incompressible liquid flows through a horizontal tube as shown in the following fig. Then the velocity v of the fluid is

A
3.0 m/s

B
1.5 m/s

C
1.0 m/s

D
2.25 m/s

Solution
Question 6
4 / -1

There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = 10⁵N/m²) then the velocity of water flowing from hole is

A
20 m/s

B

C

D
None of these

Solution
Question 7
4 / -1

There is a hole of area A at the bottom of cylindrical vessel. Water is filled up to a height h and water flows out in t second. If water is filled to a height 4h, it will flow out in time equal to

A
t

B
4t

C
2t

D
t/4

Solution
Question 8
4 / -1

A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is

A
0.1

B
0.05

C
0.005

D
0.0005

Solution
Question 9
4 / -1

A small sphere of mass m is dropped from a great height. After it has fallen 100 m, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is

A
Greater than the work done by air friction in the second 100 m

B
Less than the work done by air friction in the second 100 m

C
Equal to 100 mg

D
Greater than 100 mg
Question 10
4 / -1

We have two (narrow) capillary tubes T₁ and T₂. Their lengths are l₁ and l₂ and radii of cross-section are r₁ and r₂ respectively. The rate of flow of water under a pressure difference P through tube T₁ is 8 cm³/sec. If l₁ = 2l₂ and r₁ = r₂ , what will be the rate of flow when the two tubes are connected in series and pressure difference across the combination is same as before? (= P)

A
4 cm³/sec

B
(16/3) cm³/sec

C
(8/17) cm³/sec

D
None of these

Solution