SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Level 3 · Challenge

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SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Level 3 · Challenge – 8 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.  
The pistons of a hydraulic press have diameters 3 cm and 30 cm. A force of 50 N on the small piston produces on the large piston a force of:

Correct Answer: B [5000 N]

Explanation:

Diameters ratio 10 → areas ratio 100 → 50 × 100 = 5000 N.

2.  
A block floats in water with 30% of its volume above the surface. Its density is:

Correct Answer: D [700 kg/m³]

Explanation:

70% under → ρ = 0.7 × 1000 = 700 kg/m³.

3.  
A wooden cube of density 600 kg/m³ is put in a liquid of density 800 kg/m³. The fraction of its volume submerged is:

Correct Answer: A [3/4]

Explanation:

Answer: 3/4. 600/800 = 3/4.

4.  
A wire has Young's modulus 2 × 10¹¹ Pa. Under a stress of 10⁸ Pa its strain is:

Correct Answer: C [5 × 10⁻⁴]

Explanation:

Strain = stress/Y = 10⁸/(2 × 10¹¹).

5.  
Spot My Mistake“Rubber is more elastic than steel, because rubber stretches much more for the same force.” The correct statement is:

Correct Answer: D [Steel is more elastic, because it needs a larger stress for the same strain]

Explanation:

Elasticity is measured by Young's modulus; steel's is far larger.

6.  
If the diameter of a water pipe narrows to half, the speed of water in the narrow part becomes:

Correct Answer: B [four times]

Explanation:

A v = constant and A ∝ d² → v × 4.

7.  
A diver is 30 m below the surface of a lake. Taking atmospheric pressure as 1 × 10⁵ Pa and g = 10 m/s², the total pressure on him is:

Correct Answer: C [4 × 10⁵ Pa]

Explanation:

1 × 10⁵ + 30 × 1000 × 10 = 4 × 10⁵ Pa.

8.  
Reverse questionA helium-filled balloon rises in air. Which principle explains it?

Correct Answer: A [Archimedes' principle]

Explanation:

Upthrust of air (weight of air displaced) exceeds the balloon's weight.

➤ 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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