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This mock test of Test: Thrust And Pressure for Class 9 helps you for every Class 9 entrance exam.
This contains 10 Multiple Choice Questions for Class 9 Test: Thrust And Pressure (mcq) to study with solutions a complete question bank.
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QUESTION: 1

Thrust exerted by an iron cuboid when placed on sand is equal to

Solution:

QUESTION: 2

If weight of an object is equal or less than upthrust acting on it then object would

Solution:

QUESTION: 3

The pressure exerted by water (density = 10^{3} kg/m^{3}) on the bottom surface (2m × 4m) of tank having dimensions 2m × 4m × 2m is

Solution:

QUESTION: 4

The SI unit of pressure is

Solution:

QUESTION: 5

A sharp edge blade is more effective in cutting than a blunt blade due to

Solution:

QUESTION: 6

For a given applied thrust, pressure exerted on a surface by a sharp pin is

Solution:

Pressure exerted by a sharp needle on a surface is more than the pressure exerted by a blunt needle.

QUESTION: 7

The neck and bottom of a bottle are 2cm and 20 cm in diameter respectively. The cork is pressed with same pressure. If the cork is pressed with a force of 1.2 kgf on the neck of the bottle, the force exerted on the bottom of the bottle will be

Solution:

Diameter of the neck is = 2cm = 0.02m

So, the area of the cross section of the neck is, a = Πd² /4 = 0.000314 m²

Diameter of the bottom is = 20cm = 0.2m

So, the area of the cross section of bottom is, A = Πd² /4 = 0.0314 m²

Force applied to the cork, f = 1.2 kgf

Let F be the force at the bottom, According to pascal’s law F/A = f/a

⇒ F = (f/a)*A = (1.2/0.000314)*(0.0314) = 120 Kgf

QUESTION: 8

An object exerts a force F on a surface of surface area A. The pressure P acting on the surface is given by

Solution:

The pressure acting on the surface is given by P = F/A

The force applied os perpendicular to the surface of objects per unit area. Here, P is the pressure, F is the force and A is the area. Pressure is scalar quality and its unit is pa

(pascal). Thus, the pressure acting on the surface is given by P = F/A.

QUESTION: 9

To observe and compare the pressure exerted by three different faces of a cuboid on sand, the following Cuboid is available to you:

(A) Wooden cuboid of dimension 20 cm x 30 cm x 50 cm

(B) Aluminium cuboid of dimension 3 cm x 6 cm x 12 cm

(C) Iron cuboid of dimension 5 cm x 10 cm x 15 cm

(D) Iron cuboid of dimension 20 cm x 30 cm x 15 cm

The best choice from the practical point of view would be:

Solution:
It will give us a correct measure of high and low pressure on different faces like 20×30 cm will give lowest pressure and 20×15 will give highest pressure and iron has quite large weight so it will be easy for us to determine pressure and collect information.

QUESTION: 10

A rectangular block of wood of dimensions 40cm x 20cm x 10cm is kept on a table top. The pressure is greatest when it is rested on

Solution:

Mass of the Wooden block, m = 5Kg

Thrust due to wooden block, Mg = 5kg x 9.8 m/s² = 49N

(a) Surface area of 20 Cm x 10 Cm surface ,

A = (20 x 10) cm² = (0.2 x 0.1) m² = 0.02 m²

P = mg / A = 49 N / 0.02 m² = 49/0.02 N/m²

Or Pressure, P = 2450 N/m²

(b) Surface area of 40 cm x 20 cm surface,

A = ( 40 x 20) cm² = ( 0.4 x 0.2 ) m² = 0.08 m²

P = mg / A = 49 N / 0.08 m² = 49/0.08 N/m²

Or Pressure, P = 612.5 N/m²

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