SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Properties of Matter: Pressure, Fluids, Elasticity, Surface Tension – Level 1 · Warm-up · Tier I Level – 12 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.  
One-line factOne pascal, the SI unit of pressure, is equal to:

Correct Answer: A [1 N/m²]

Explanation:

Pressure = force ÷ area, so 1 Pa = 1 N/m²; the bar (10⁵ Pa) is not an SI unit.

2.  
Hydraulic brakes in vehicles work on:

Correct Answer: C [Pascal's law]

Explanation:

Pressure applied to the enclosed brake fluid is transmitted equally to all wheels.

3.  
The upthrust on a body immersed in a liquid is equal to:

Correct Answer: D [the weight of the liquid displaced]

Explanation:

Answer: the weight of the liquid displaced. Archimedes' principle.

4.  
Raindrops are nearly spherical because of:

Correct Answer: B [surface tension]

Explanation:

A sphere has the least surface area for a given volume.

5.  
Odd one outOdd one out (by the principle used):

Correct Answer: C [hydraulic press]

Explanation:

The hydraulic press uses Pascal's law; the others use Bernoulli's principle.

6.  
Which of these is the most elastic?

Correct Answer: B [steel]

Explanation:

Steel has the largest Young's modulus – it needs the largest stress for a given strain.

7.  
When a liquid is heated, its viscosity:

Correct Answer: D [decreases]

Explanation:

Hot honey or oil flows more easily.

8.  
Fill in the blankKerosene rises up the wick of a lamp due to ____.

Correct Answer: A [capillarity]

Explanation:

Fine pores of the wick act as capillary tubes.

9.  
A solid body floats in water when its average density is:

Correct Answer: A [less than that of water]

Explanation:

Answer: less than that of water. Floats if ρ(body) < ρ(water).

10.  
Statement-basedConsider the statements:
I. Pressure in a liquid increases with depth.
II. Pressure at a given depth depends on the shape of the vessel.
Which is/are correct?

Correct Answer: D [Only I]

Explanation:

P = hρg – depends on depth and density, not on shape.

11.  
Normal atmospheric pressure at sea level supports a mercury column of about:

Correct Answer: C [76 cm]

Explanation:

1 atm ≈ 76 cm of Hg ≈ 1.013 × 10⁵ Pa.

12.  
The device used to measure atmospheric pressure is the:

Correct Answer: B [barometer]

Explanation:

Barometer – air pressure; hydrometer – density of liquids.

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