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MCQ : Gravitation (Floatation) - 2 - Class 9 MCQ


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10 Questions MCQ Test Science Class 9 - MCQ : Gravitation (Floatation) - 2

MCQ : Gravitation (Floatation) - 2 for Class 9 2024 is part of Science Class 9 preparation. The MCQ : Gravitation (Floatation) - 2 questions and answers have been prepared according to the Class 9 exam syllabus.The MCQ : Gravitation (Floatation) - 2 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ : Gravitation (Floatation) - 2 below.
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MCQ : Gravitation (Floatation) - 2 - Question 1

A weightless balloon contains 200 g of water. Its weight in water will be

Detailed Solution for MCQ : Gravitation (Floatation) - 2 - Question 1

A weightless balloon contains 200 g200 g of water. Its weight in water will be zero.
Weight of balloon with 200 g, W=0.2g, where g is the acceleration due to gravity. When the rubber balloon is put in the water, the upthrust acting on the balloon is F=ρVg, where ρ is the density of the fluid, V is volume.
So, ρVg=0.2g
⇒F=0.2g⇒
Therefore, the Net force is zero on the balloon.
The resultant weight in water is zero as there is no resultant force acting upon it. The balloon is weightless, hence the water in it will be the total weight of the balloon.

MCQ : Gravitation (Floatation) - 2 - Question 2

School bags have a broader base to reduce

MCQ : Gravitation (Floatation) - 2 - Question 3

When a body floats in a liquid, its apparent weight is always

Detailed Solution for MCQ : Gravitation (Floatation) - 2 - Question 3

Apparent weight is lessened by buoyancy, which occurs when an object is immersed in a fluid (a liquid or a gas). For example, an object immersed in water weighs less, according to a spring balance, than the same object in air. The apparent weight of a floating object is zero.

MCQ : Gravitation (Floatation) - 2 - Question 4

 A mass weighing W can float if the upthrust U is related as

Detailed Solution for MCQ : Gravitation (Floatation) - 2 - Question 4

If the weight of water is greater than the upward buoyant force acting on it, then net force W−U acts downwards. Hence the body displaces downwards, that is, sink.

MCQ : Gravitation (Floatation) - 2 - Question 5

The relative density of a solid is 0.6. It floats in water with

MCQ : Gravitation (Floatation) - 2 - Question 6

The least value of apparent weight of a body in a fluid is

MCQ : Gravitation (Floatation) - 2 - Question 7

The pressure exerted by man on earth is minimum when he

MCQ : Gravitation (Floatation) - 2 - Question 8

An empty closed drum and a filled drum of same dimension will bring

Detailed Solution for MCQ : Gravitation (Floatation) - 2 - Question 8

Correct Answer :- c

Explanation : An empty closed drum and a filled drum of same dimension will bring same upthrust and same volume

MCQ : Gravitation (Floatation) - 2 - Question 9

The relation between force F, pressure P and area A is

MCQ : Gravitation (Floatation) - 2 - Question 10

A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways.In which of the following cases, pressure exerted by the brick will be

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