Explore Exams
Login Signup
Sign in Open App
CBSE Class 9  >  Class 9 Test  >  Science   >  MCQ : Gravitation (Floatation) - Class 9 MCQ

MCQ : Gravitation (Floatation) Class 9 Science MCQs & solutions - Free


MCQ Practice Test & Solutions: MCQ : Gravitation (Floatation) (10 Questions)

You can prepare effectively for Class 9 Science Class 9 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "MCQ : Gravitation (Floatation)". These 10 questions have been designed by the experts with the latest curriculum of Class 9 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

Sign up on EduRev for free to attempt this test and track your preparation progress.

MCQ : Gravitation (Floatation) - Question 1
Save

Why does a block of wood exert different pressures on a table depending on its orientation?

Detailed Solution: 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
Save

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: 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.

Clear all your doubts with EduRev
MCQ : Gravitation (Floatation) - Question 3
Save

What principle explains why a ship made of iron floats on water while a sheet of the same material sinks?

Detailed Solution: 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
Save

What does Archimedes’ Principle state about the buoyant force on an immersed object?

Detailed Solution: 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
Save

Why does a closed and empty plastic bottle float on water?

Detailed Solution: 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. According to Archimedes' Principle, if the weight of the water displaced by an object is more than the object's weight, the object will float. In this case, the air inside the closed bottle reduces its average density, allowing it to displace enough water to make the upward buoyant force greater than its own weight, causing it to float.
Correct Option: B

MCQ : Gravitation (Floatation) - Question 6
Save

What is the primary reason for using wide foundations in buildings?

Detailed Solution: 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
Save

How does the pressure exerted by a nail change when it is compared to a flat surface?

Detailed Solution: Question 7

Pressure is the force per unit area 
P = F/A, where F is the force and A is the contact area.

For the same force, a smaller contact area gives a larger value of P, because P is inversely proportional to A.

As the nail's tip has a much smaller contact area than a flat surface, P_nail > P_flat.
Therefore the pressure exerted by the nail is greater, which helps it to penetrate surfaces more easily.

So, the pressure increases by a nail change when it is compared to a flat surface.

MCQ : Gravitation (Floatation) - Question 8
Save

In which scenario would you expect the pressure exerted by a block of wood to be greatest?

Detailed Solution: 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
Save

What does Pascal’s Law state about the pressure in confined fluids?

Detailed Solution: 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
Save

Why does an iron nail sink in water while a cork floats, despite both having the same mass?

Detailed Solution: 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.

88 videos|481 docs|61 tests
Join Course
Information about MCQ : Gravitation (Floatation) Page
In this test you can find the Exam questions for MCQ : Gravitation (Floatation) solved & explained in the simplest way possible. Besides giving Questions and answers for MCQ : Gravitation (Floatation), EduRev gives you an ample number of Online tests for practice
88 videos|481 docs|61 tests
Join Course
Download as PDF

About this Class 9 Practice Test

This test contains 10 MCQs on MCQ : Gravitation (Floatation) with detailed solutions for each question. It is part of the Science Class 9 course on EduRev, designed to align with the current Class 9 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

Explore more Class 9 Study Resources

If you found this MCQ : Gravitation (Floatation) MCQ Test helpful, you can further enhance your Class 9 preparation with in-depth courses on EduRev, for all the subjects and topics available in Science Class 9 course. The course offers:
  • Video Lectures: covering all the topics of Science Class 9
  • Notes for Revision: offering revision notes, important questions, summaries, flashcards, cheatsheets & more for Class 9 preparation
  • MCQ Test: variety of questions as per the pattern of Class 9 exam
Signup on EduRev and stay on top of your study goals
10M+ students crushing their study goals daily