Properties of Matter Test

Result

Properties of Matter Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Statement-1: In case of motion of an ideal fluid in a horizontal tube, where the area of cross-section is minimum, pressure is maximum.

Statement-2: Hydrostatic pressure in different ideal liquids at points of different depth can be same.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Applying Principle of continuity & Bernoullies theorem A ↓ v ↑ P ↓,
h₁d₁ = h₂d₂

The correct answer is: Statement-1 is false but Statement-2 is true.
Question 2
1 / -0

A rain drop of radius 0.3 mm falling vertically downwards in air has a terminal velocity of 1 m/s. Viscosity of air is 18 ×10^–5 poise. The viscous force on the drop is

A
101.73 ×10^–4 dyne

B
180.7 x 10^–4 dyne

C
167.35 × 10^–5 dyne

D
217.2 × 10^-5 dyne

Solution

Viscous force = 6p h r v

= 6p × 18 × 10^-5 × 0.03 × 100

= 101.73 × 10^-4 dyne

The correct answer is: 101.73 ×10^–4 dyne