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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: Electric Current, Potential Difference, Resistance and Resistivity

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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:
6.06 x 105 Pa
4.04 x 105 Pa (approx. 4.0 atmospheres)
3.03 x 105 Pa
1.01 x 105 Pa
2.
Why are hydroelectric storage dams constructed with a base that is significantly thicker than the crest?
To reduce the gravitational pull of the bedrock
To allow fish to swim upstream through drainage gates
To prevent solar radiation from penetrating the foundation
Because hydrostatic water pressure increases linearly with depth (P = rho * g * h), exerting immense overturning forces at the bottom
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
68 N
78 N
100 N
4.
Pure water reaches its maximum density (1.000 g/cm3 or 1000 kg/m3) at a temperature of:
4.0 °C
-4.0 °C
25.0 °C
0.0 °C
5.
A U-tube contains water (ρ = 1000 kg/m3) and oil (ρ = 800 kg/m3). If the oil column height above the interface is 10 cm, the balancing water column height is:
10 cm
6.4 cm
12.5 cm
8 cm
6.
Real gases behave most closely to an ideal gas under conditions of:
High pressure and near liquefaction point
Zero gravitational acceleration
Very low pressure and high temperature (where intermolecular attraction forces and molecular volumes become negligible)
Extremely high pressure and low temperature
7.
If both inductance \(L\) and capacitance \(C\) in a resonant circuit are doubled, the resonance frequency will:
C) Decrease to half its original value
D) Remain unchanged
B) Quadruple
A) Double
8.
In stimulated emission, the emitted photon and the triggering incident photon are characterized by having:
B) The exact same phase, frequency, direction, and polarization
A) Different wavelengths and perpendicular directions
D) Independent speeds in vacuum
C) A random phase difference of $pi/2$
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