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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: Blackbody Radiation, Max Planck Hypothesis and the Photon

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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
50,000 N
2 N
5000 N
2.
Why are hydroelectric storage dams constructed with a base that is significantly thicker than the crest?
Because hydrostatic water pressure increases linearly with depth (P = rho * g * h), exerting immense overturning forces at the bottom
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
3.
Pure water reaches its maximum density (1.000 g/cm3 or 1000 kg/m3) at a temperature of:
4.0 °C
25.0 °C
-4.0 °C
0.0 °C
4.
A gas cylinder contains 10 liters of gas at a pressure of 3.0 atm. If the volume is reduced to 2.5 liters at constant temperature, the new pressure inside the cylinder will be:
6.0 atm
12.0 atm
7.5 atm
1.2 atm
5.
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
6.
If both the absolute temperature and the absolute pressure of a confined ideal gas are doubled, the volume of the gas:
Remains constant and unchanged
Doubles to twice its original volume
Decreases to one-fourth
Quadruples
7.
The density of an ideal gas at temperature T and pressure P is rho. If the pressure is tripled and the absolute temperature is halved, the new density becomes:
1.5 rho
0.67 rho
3 rho
6 rho (since rho is proportional to P / T)
8.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
A) Due to ambient room temperature fluctuations
D) Due to friction on the rotating pulley axis
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
9.
In a pure capacitor circuit connected to an AC source, the average power consumed over a full cycle is:
A) \(V_{text{eff}} times I_{text{eff}}\)
C) Zero
B) \(I_{text{eff}}^2 times X_C\)
D) \(0.5 times V_{max} times I_{max}\)
10.
In an R-L-C circuit, if \(V_R = 30\) V, \(V_L = 80\) V, and \(V_C = 40\) V, the total supply voltage across the circuit is:
D) 10 V
A) 150 V
B) 70 V
C) 50 V
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