SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Level 2 · Exam Level · Tier I Sprint – 15 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
A force of 500 N acts on an area of 0.25 m². The pressure is:

Correct Answer: D [2000 Pa]

Explanation:

Answer: 2000 Pa. 500/0.25 = 2000 Pa.

2.  
The pressure due to water at a depth of 15 m is (ρ = 1000 kg/m³, g = 10 m/s²):

Correct Answer: B [1.5 × 10⁵ Pa]

Explanation:

hρg = 15 × 1000 × 10 = 1.5 × 10⁵ Pa.

3.  
The pistons of a hydraulic jack have areas 5 cm² and 250 cm². A force of 40 N on the small piston can lift:

Correct Answer: C [2000 N]

Explanation:

Areas given – do not square: 40 × 250/5 = 2000 N.

4.  
A body weighs 50 N in air and 40 N when completely immersed in water. Its relative density is:

Correct Answer: A [5]

Explanation:

Answer: 5. RD = 50 ÷ (50 − 40) = 5.

5.  
Match the followingMatch the device with its principle:
P. Hydraulic jack Q. Submarine R. Perfume sprayer S. Blotting paper
1. Bernoulli's principle 2. Capillarity 3. Pascal's law 4. Archimedes' principle

Correct Answer: B [P-3, Q-4, R-1, S-2]

Explanation:

Jack – Pascal; submarine – buoyancy; sprayer – Bernoulli; blotting paper – capillarity.

6.  
Ice (density 917 kg/m³) floats in fresh water. About what percentage of its volume is under water?

Correct Answer: C [about 92%]

Explanation:

Fraction under = 917/1000 ≈ 0.92.

7.  
Assertion–ReasonAssertion (A): A ship rises a little when it sails from a river into the sea.
Reason (R): Sea water is denser than river water, so a smaller volume gives the same upthrust.

Correct Answer: D [Both A and R are true and R explains A]

Explanation:

Same weight must be balanced; denser water → less volume displaced → ship floats higher.

8.  
Two-quantity comparisonTwo-quantity comparison (same liquid, same glass):
Quantity I: capillary rise in a tube of radius 0.2 mm
Quantity II: capillary rise in a tube of radius 0.4 mm

Correct Answer: A [Quantity I > Quantity II]

Explanation:

h ∝ 1/r → the narrower tube gives twice the rise.

9.  
Soaps and detergents help in washing clothes mainly because they:

Correct Answer: A [lower the surface tension of water]

Explanation:

Lower surface tension lets water spread into fibres and wet the dirt.

10.  
Arrange in orderArrange in increasing order of density: mercury, ice, aluminium, water

Correct Answer: A [ice < water < aluminium < mercury]

Explanation:

Ice 917 < water 1000 < aluminium 2700 < mercury 13 600 kg/m³.

11.  
True/false countHow many of these are explained by Bernoulli's principle?
I. Lift on an aeroplane wing
II. A roof blown off in a storm
III. A hydraulic lift
IV. Two boats moving side by side drawn together

Correct Answer: B [3]

Explanation:

I, II and IV; the hydraulic lift uses Pascal's law.

12.  
When a glass capillary tube is dipped in mercury, the mercury:

Correct Answer: D [falls below the outside level with a convex surface]

Explanation:

Cohesion > adhesion; angle of contact ≈ 140° → depression.

13.  
The SI unit of Young's modulus is the same as that of:

Correct Answer: C [pressure]

Explanation:

Y = stress/strain → N/m² = Pa.

14.  
Diagram-basedA block floats in water as shown (water density 1000 kg/m³). The density of the block is:

Correct Answer: C [750 kg/m³]

Explanation:

3/4 of the block is under water → ρ = 0.75 × 1000 = 750 kg/m³.

15.  
A hydrometer is placed in turn in kerosene, water, sea water and glycerine. It sinks deepest in:

Correct Answer: A [kerosene]

Explanation:

A floating body sinks deeper in a less dense liquid; kerosene (≈ 800 kg/m³) is the least dense.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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