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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: Laser Physics, Population Inversion and the Helium-Neon Laser

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1.
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:
2500 N
2 N
5000 N
50,000 N
2.
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
3.
The universal gas constant R in SI units has the numerical value and dimensions of:
0.0821 J / mol
8.314 J / (mol . K)
1.38 x 10−23 Pa . m3
6.022 x 1023 J / K
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