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MCQ : Gravitation (Floatation) - 1


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10 Questions MCQ Test Physics for Class 9 | MCQ : Gravitation (Floatation) - 1

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MCQ : Gravitation (Floatation) - 1 - Question 1

Upthrust on a body depends on

Detailed Solution for MCQ : Gravitation (Floatation) - 1 - Question 1

Density is one factor affecting upthrust (buoyant force). If the density of the substance is more than the density of the fluid, then the upthrust will be less and thus the substance sinks. If the density of the substance is less than the density of the fluid, then the upthrust will be more and thus the substance float.

MCQ : Gravitation (Floatation) - 1 - Question 2

According to Archimedes’ principle when a body is submerged in a liquid, its apparent weight

MCQ : Gravitation (Floatation) - 1 - Question 3

If upthrust U is equal to 1/4  the weight of the object in air, then the weight felt in the liquid is

Detailed Solution for MCQ : Gravitation (Floatation) - 1 - Question 3

Upthrust = apparent loss of weight of object = weight in air - weight in liquid.

weight in air= W
Upthrust ,U= W/4
weight in liquid = weight in air- Upthrust
= W - W/4
=3W/4

 

MCQ : Gravitation (Floatation) - 1 - Question 4

Archimedes’ principle holds for

Detailed Solution for MCQ : Gravitation (Floatation) - 1 - Question 4

Archimedes principle states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. The principal applies to both floating and submerged bodies and to all fluids, i.e. liquid and gases. If the body is denser than the fluid it will sink.

MCQ : Gravitation (Floatation) - 1 - Question 5

In a tank having ‘h' height of the liquid, two points at a depth  3h/4 from free surface have pressures PA and PB . When the point A is more closer to the wall than B. Then

MCQ : Gravitation (Floatation) - 1 - Question 6

When a body is weighed in a liquid, the loss in weight is equal to

Detailed Solution for MCQ : Gravitation (Floatation) - 1 - Question 6

 The correct answer is a

   Archimedes' principle, a physical law of buoyancy, states that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force the magnitude of which is equal to the weight of the fluid displaced by the body.

MCQ : Gravitation (Floatation) - 1 - Question 7

A heavy cylinder of length 1 is slowly taken out of a dense liquid. The weight felt as it is taken out of the liquid

MCQ : Gravitation (Floatation) - 1 - Question 8

The walls of a dam at the bottom are made thick because

MCQ : Gravitation (Floatation) - 1 - Question 9

An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be

MCQ : Gravitation (Floatation) - 1 - Question 10

Two stretched membranes of area 2 m2 and 3 m2 are placed in a liquid at the same depth. The ratio of pressure on them is

Detailed Solution for MCQ : Gravitation (Floatation) - 1 - Question 10

Pressure on membrane is P=ρgh

Since the density of both membranes is same.

Since both the membranes are placed at same depth ,So pressure will be same on both of then .

P2​/P1​​=ρgh/ρgh​=1

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