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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1 Quiz: Density, Liquid Pressure and Pascal Principle

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1.
The hydrostatic pressure exerted by a static homogeneous liquid of density rho at depth h beneath its free surface is expressed by:
P = rho * h / g
P = rho * g * h
P = rho * g / h
P = 1/2 rho * g * h2
2.
A diver descends to a depth of 30 meters in seawater (density = 1030 kg/m3). If atmospheric pressure is 1.013 x 105 Pa and g = 9.8 m/s2, the total absolute pressure experienced by the diver is approximately:
1.01 x 105 Pa
6.06 x 105 Pa
3.03 x 105 Pa
4.04 x 105 Pa (approx. 4.0 atmospheres)
3.
Pascal's principle states that when pressure is applied to an enclosed, incompressible fluid, it is transmitted:
Only downwards towards the bottom of the vessel
Strictly to compressible gases
Undiminished to every portion of the fluid and to the walls of the containing vessel
With an exponential decay as distance increases
4.
In a hydraulic press, the ratio of the cross-sectional area of the large piston to that of the small piston is 50. If a force of 100 N is exerted on the small piston, the maximum force exerted by the large piston is:
5000 N
2 N
2500 N
50,000 N
5.
Why are hydroelectric storage dams constructed with a base that is significantly thicker than the crest?
To allow fish to swim upstream through drainage gates
Because hydrostatic water pressure increases linearly with depth (P = rho * g * h), exerting immense overturning forces at the bottom
To prevent solar radiation from penetrating the foundation
To reduce the gravitational pull of the bedrock
6.
A metallic cube of side length 10 cm and density 7800 kg/m3 is completely submerged in water (density 1000 kg/m3). The buoyant force (upthrust) acting on the cube is (g = 10 m/s2):
68 N
100 N
78 N
10 N
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