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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: The Hot-Wire Ammeter and Single Element AC Circuits

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1.
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
4.04 x 105 Pa (approx. 4.0 atmospheres)
3.03 x 105 Pa
2.
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:
2 N
50,000 N
5000 N
2500 N
3.
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):
10 N
78 N
68 N
100 N
4.
An air bubble released from the bottom of a deep lake expands in volume as it rises towards the surface because:
The water temperature at the surface is near absolute zero
Atmospheric pressure increases at the surface
The bubble absorbs water molecules into its gas phase
The hydrostatic pressure decreases as depth decreases, allowing the trapped air to expand according to Boyle's law
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