CBSE Class 9 Physics Hydrostatics MCQs Set 18

Practice MCQs for Class 9 Physics Hydrostatics

Access targeted multiple-choice questions for Hydrostatics designed to align with the latest CBSE academic syllabus for Class 9 Physics. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Access Hydrostatics Questions and Solutions

View or download the dedicated Hydrostatics MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Physics evaluations.

Multiple Choice Questions

Question 1: Ice floats on water because
(a) its density is more than that of water
(b) water is colder than ice
(c) ice is a solid
(d) its density is less than that of water
Show Answer & Explanation

Answer: (d) its density is less than that of water

Explanation:
1. A body floats if its density is less than that of the liquid.
2. Ice is about 9 percent less dense than water.

Teacher's Note:
1. Density comparison.

Question 2: The Plimsoll line marked on a ship shows
(a) the maximum level to which the ship may safely be loaded
(b) the speed limit of the ship
(c) the height of the deck
(d) the depth of the sea
Show Answer & Explanation

Answer: (a) the maximum level to which the ship may safely be loaded

Explanation:
1. It is a load-line mark on the hull.
2. Ships must not sink below the mark when loaded.

Teacher's Note:
1. Safety limit of submergence.

Question 3: A lactometer used to test the purity of milk is a form of
(a) barometer
(b) hydrometer, which measures density
(c) manometer
(d) thermometer
Show Answer & Explanation

Answer: (b) hydrometer, which measures density

Explanation:
1. A lactometer floats in milk and measures its density.
2. Adding water lowers the density, which shows up as a different reading.

Teacher's Note:
1. A floating instrument measures density.

Question 4: The word 'Eureka' is associated with Archimedes' discovery of
(a) gravitation
(b) atmospheric pressure
(c) buoyancy (the upward force on a body in a liquid)
(d) the lever
Show Answer & Explanation

Answer: (c) buoyancy (the upward force on a body in a liquid)

Explanation:
1. Eureka means 'I have found it'.
2. Archimedes found that a body immersed in liquid experiences an upward force equal to the weight of the liquid displaced.

Teacher's Note:
1. Archimedes' principle.

Question 5: A drawing pin has a broad head and a pointed tip because
(a) it looks better
(b) the tip has more force than the head
(c) pressure does not depend on area
(d) a large force on the head gives a very large pressure at the tip
Show Answer & Explanation

Answer: (d) a large force on the head gives a very large pressure at the tip

Explanation:
1. \( P=\frac FA \): the same force acts over the small area of the tip.
2. So the pressure at the tip is very large and the pin pierces easily.

Teacher's Note:
1. Pressure is inversely proportional to area.

Question 6: A sharp knife cuts a fruit more easily than a blunt knife because the sharp blade
(a) has a smaller area of contact, so the same force gives greater pressure
(b) has a larger area of contact
(c) is heavier
(d) is made of harder metal
Show Answer & Explanation

Answer: (a) has a smaller area of contact, so the same force gives greater pressure

Explanation:
1. \( P=\frac FA \); smaller area gives greater pressure for the same force.

Teacher's Note:
1. Pressure is inversely proportional to area.

Question 7: We do not feel the large atmospheric pressure acting on our body because
(a) the pressure acts only on the ground
(b) the blood and body fluids exert an equal pressure from inside
(c) the air is very light
(d) our skin is thick
Show Answer & Explanation

Answer: (b) the blood and body fluids exert an equal pressure from inside

Explanation:
1. The pressure inside the body balances the outside pressure.
2. So there is no net force and we do not feel it.

Teacher's Note:
1. Balanced pressures.

Question 8: Water comes out with greater speed from a tap on the ground floor than from a tap on the top floor because
(a) water is heavier on the ground floor
(b) the pipe is wider on the ground floor
(c) the pressure of water increases with depth
(d) air pressure is lower on the ground floor
Show Answer & Explanation

Answer: (c) the pressure of water increases with depth

Explanation:
1. The pressure at a point is \( P=h\rho g \), where \( h \) is depth below the water level in the tank.
2. The ground-floor tap is deeper, so the pressure and speed are greater.

Teacher's Note:
1. Pressure increases with depth.

Question 9: A solid iron chunk sinks in water but floats on mercury because the density of iron is
(a) less than that of water
(b) more than that of mercury
(c) equal to that of mercury
(d) more than that of water but less than that of mercury
Show Answer & Explanation

Answer: (d) more than that of water but less than that of mercury

Explanation:
1. Density of iron \( \approx7.9 \) g/cm\( ^3 \), of water \( 1 \) and of mercury \( 13.6 \).
2. A body sinks in a liquid less dense than itself and floats in one that is denser.

Teacher's Note:
1. Compare the densities.

Question 10: The instrument that measures atmospheric pressure without using any liquid is the
(a) aneroid barometer
(b) Fortin barometer
(c) manometer
(d) hydrometer
Show Answer & Explanation

Answer: (a) aneroid barometer

Explanation:
1. 'Aneroid' means without liquid; it uses a metal box and a spring.
2. Liquid barometers such as the Fortin barometer use mercury.

Teacher's Note:
1. Aneroid means no liquid.

Free study material for Science

Hydrostatics Objective Questions & Solutions for Class 9 Physics

Class 9 Physics Hydrostatics Objective Test Questions

Explore reliable practice questions for Hydrostatics tailored for Class 9 Physics learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

NCERT-Aligned Objective Questions and Solutions

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FAQs

Where can I access latest CBSE Class 9 Physics Hydrostatics MCQs Set 18?

You can get most exhaustive CBSE Class 9 Physics Hydrostatics MCQs Set 18 for free on StudiesToday.com. These MCQs for Class 9 Physics are updated for the 2026-27 academic session as per CBSE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Physics Class 9 material?

Yes, our CBSE Class 9 Physics Hydrostatics MCQs Set 18 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

How do practicing Physics MCQs help in scoring full marks in Class 9 exams?

By solving our CBSE Class 9 Physics Hydrostatics MCQs Set 18, Class 9 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.

Do you provide answers and explanations for CBSE Class 9 Physics Hydrostatics MCQs Set 18?

Yes, Physics MCQs for Class 9 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.

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