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Class 9 Exam  >  Class 9 Tests  >  Science Class 9  >  MCQ : Gravitation (Floatation) - Class 9 MCQ

MCQ : Gravitation (Floatation) - Class 9 MCQ


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

MCQ : Gravitation (Floatation) for Class 9 2024 is part of Science Class 9 preparation. The MCQ : Gravitation (Floatation) questions and answers have been prepared according to the Class 9 exam syllabus.The MCQ : Gravitation (Floatation) MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ : Gravitation (Floatation) below.
Solutions of MCQ : Gravitation (Floatation) questions in English are available as part of our Science Class 9 for Class 9 & MCQ : Gravitation (Floatation) solutions in Hindi for Science Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt MCQ : Gravitation (Floatation) | 10 questions in 10 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Class 9 for Class 9 Exam | Download free PDF with solutions
MCQ : Gravitation (Floatation) - Question 1
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Why does a block of wood exert different pressures on a table depending on its orientation?

Detailed Solution for MCQ : Gravitation (Floatation) - Question 1
The pressure exerted by a block of wood on a table varies with the orientation due to the difference in the area of contact. Pressure is calculated by dividing the thrust (force) by the area over which it acts. A smaller contact area results in higher pressure, while a larger area results in lower pressure. Thus, changing the side of the block in contact with the table alters the pressure exerted.
MCQ : Gravitation (Floatation) - Question 2
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When a stone is gradually lowered into water, what causes the decrease in the elongation of the string or reading on the balance?

Detailed Solution for MCQ : Gravitation (Floatation) - Question 2
The decrease in the elongation of the string or reading on the balance is due to the increase in the buoyant force acting on the stone as it is lowered into the water. The buoyant force, which is the upward force exerted by the fluid, counteracts some of the stone's weight, thereby reducing the net force measured by the balance. The buoyant force equals the weight of the water displaced by the stone.
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MCQ : Gravitation (Floatation) - Question 3
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What principle explains why a ship made of iron floats on water while a sheet of the same material sinks?

Detailed Solution for MCQ : Gravitation (Floatation) - Question 3
Archimedes’ Principle explains why a ship made of iron floats on water while a sheet of the same material sinks. According to this principle, an object will float if the buoyant force (equal to the weight of the displaced fluid) is greater than or equal to the weight of the object. A ship has a large volume, which displaces a substantial amount of water, generating a buoyant force that supports its weight. Conversely, a thin sheet of iron displaces less water, resulting in insufficient buoyant force to counteract its weight, causing it to sink.
MCQ : Gravitation (Floatation) - Question 4
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What does Archimedes’ Principle state about the buoyant force on an immersed object?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 4
Archimedes’ Principle states that the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object. This principle explains why objects float or sink depending on whether their weight is less than or greater than the buoyant force acting on them.
MCQ : Gravitation (Floatation) - Question 5
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Why does a plastic bottle float in water when it is closed and empty?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 5
A closed and empty plastic bottle floats in water because it displaces a volume of water whose weight is greater than the weight of the bottle. The buoyant force on the bottle, which is equal to the weight of the displaced water, is sufficient to counteract the weight of the bottle, causing it to float.
MCQ : Gravitation (Floatation) - Question 6
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What is the primary reason for using wide foundations in buildings?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 6
Wide foundations are used in buildings to distribute the weight of the building over a larger area. This distribution reduces the pressure exerted on the ground, preventing the building from sinking or causing excessive stress on the foundation soil. By spreading the load, the building's stability is enhanced.
MCQ : Gravitation (Floatation) - Question 7
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How does the pressure exerted by a nail change when it is compared to a flat surface?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 7
The pressure exerted by a nail is greater compared to a flat surface due to its smaller tip area. The same force is concentrated on a smaller area in the case of the nail, resulting in a higher pressure. This higher pressure is what allows the nail to penetrate surfaces more easily.
MCQ : Gravitation (Floatation) - Question 8
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In which scenario would you expect the pressure exerted by a block of wood to be greatest?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 8
The pressure exerted by the block of wood is greatest when it is on a side with the smallest area. This is because pressure increases as the contact area decreases, assuming the force (thrust) remains constant. A smaller area means that the same force is concentrated in a smaller space, leading to higher pressure.
MCQ : Gravitation (Floatation) - Question 9
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What does Pascal’s Law state about the pressure in confined fluids?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 9
Pascal’s Law states that pressure applied to a confined fluid is transmitted undiminished in all directions. This principle is crucial in hydraulic systems, where an applied force can be magnified through the fluid, demonstrating how pressure changes are uniformly distributed throughout the fluid.
MCQ : Gravitation (Floatation) - Question 10
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Why does an iron nail sink in water while a cork floats, despite both having the same mass?
Detailed Solution for MCQ : Gravitation (Floatation) - Question 10
The iron nail sinks while the cork floats because the density of the nail is greater than that of the water. An object sinks if its density is higher than the density of the fluid it is placed in, as it displaces less water compared to its weight, resulting in insufficient buoyant force to counteract its weight.
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