31)

The density of water at 4°C is

Class 11 Physics

A)

Both a and b

B)

1*10-3kg/m3

C)

1*103kg/m3

D)

None

32)

The ratio of density of a substance to the density of water at 4°C is called as

Class 11 Physics

A)

Humidity

B)

Relative density

C)

Density

D)

None

33)

Relative density is the _______ and positive______ quantity.

Class 11 Physics

A)

Dimensionless, vector

B)

Dimensionless, scalar

C)

Dimensional, vector

D)

Scalar, dimensionless

34)

A pressure equivalent to 1mm is called ___

Class 11 Physics

A)

A torr

B)

Cm

C)

mm of HG

D)

None

35)

In meteorology, a common unit used for pressure is

Class 11 Physics

A)

Pascal

B)

Millibar

C)

Bar

D)

Both a and b

36)

Which of the following devices are based in the Pascal’s law

Class 11 Physics

A)

Both a and b

B)

Hydraulic pumps

C)

Hydraulic lift

D)

None

37)

The study of fluid in motion is called as

Class 11 Physics

A)

Fluid dynamics

B)

Mechanics

C)

Dynamics

D)

None

38)

If at any point the velocity of each passing fluid particle is constant in time then the flow of fluid is said to be

Class 11 Physics

A)

Both a and b

B)

Steady

C)

In motion

D)

Not confirm

39)

The path taken by a fluid particle under a steady flow is a

Class 11 Physics

A)

Both a and b

B)

Streamline

C)

Not streamline

D)

None

40)

Steady flow is achieved at

Class 11 Physics

A)

Moderate speeds

B)

Low speeds

C)

High speeds

D)

Zero speeds