SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Tier II Level · Marathon

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SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Tier II Level · Marathon – 11 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.  
In Stokes' range, if the radius of a falling drop is tripled, its terminal velocity becomes:

Correct Answer: D [9 times]

Explanation:

Answer: 9 times. v(terminal) ∝ r² → 3² = 9.

2.  
The excess pressure inside a soap bubble of radius 1 cm (surface tension 0.03 N/m) is:

Correct Answer: B [12 Pa]

Explanation:

ΔP = 4T/r = 4 × 0.03/0.01 = 12 Pa.

3.  
The excess pressure inside a water drop of radius 1 mm (surface tension 0.07 N/m) is:

Correct Answer: A [140 Pa]

Explanation:

ΔP = 2T/r = 2 × 0.07/0.001 = 140 Pa.

4.  
Two soap bubbles of different sizes are connected by a tube. What happens?

Correct Answer: B [The smaller bubble shrinks and the bigger one grows]

Explanation:

The smaller bubble has the larger excess pressure (4T/r), so air flows from small to big.

5.  
Water flows out of a small hole 5 m below the water surface of a large open tank. The speed of the outflow is (g = 10 m/s²):

Correct Answer: C [10 m/s]

Explanation:

Torricelli: v = √(2gh) = √100 = 10 m/s.

6.  
Mercury (relative density 13.6) stands 76 cm high in a barometer. A barometer filled with an oil of relative density 0.8 would need a column of about:

Correct Answer: D [12.9 m]

Explanation:

Same pressure: 76 cm × 13.6 ÷ 0.8 = 1292 cm ≈ 12.9 m.

7.  
A force of 5 N stretches a spring by 2 cm. Within the elastic limit, a force of 15 N stretches it by:

Correct Answer: C [6 cm]

Explanation:

F = kx → x ∝ F → 2 × 3 = 6 cm.

8.  
Assertion–ReasonAssertion (A): Hot oil flows faster than cold oil.
Reason (R): The viscosity of a liquid decreases with rise in temperature.

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

Explanation:

Lower viscosity → less internal friction → faster flow.

9.  
A copper cube (density 8960 kg/m³) is placed in mercury (13 600 kg/m³). About what percentage of its volume is submerged?

Correct Answer: B [about 66%]

Explanation:

8960/13 600 ≈ 0.66 – copper floats on mercury with about two-thirds under.

10.  
Water (T = 0.07 N/m, angle of contact 0°) rises in a glass tube of radius 0.5 mm. The rise is (ρ = 1000 kg/m³, g = 10 m/s²):

Correct Answer: D [2.8 cm]

Explanation:

h = 2T/(rρg) = 0.14/5 = 0.028 m = 2.8 cm.

11.  
Data tableGauge pressure in a tank of an unknown liquid – depth (m): 0, 0.5, 1.0, 1.5; pressure (Pa): 0, 4000, 8000, 12 000. The density of the liquid is (g = 10 m/s²):

Correct Answer: A [800 kg/m³]

Explanation:

P = hρg → ρ = 4000/(0.5 × 10) = 800 kg/m³ (same for every row).

➤ 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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