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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.
What is the primary role of helium atoms in the Helium-Neon gas laser mixture?
To act as a semi-transparent mirror
To cool down the discharge tube
To emit the laser beam directly
To transfer excitation energy to neon atoms via inelastic collisions
2.
In a U-tube manometer containing two immiscible liquids in equilibrium, the heights of the liquid columns measured above the separating surface are:
Equal regardless of the liquids used
Proportional to the square of the cross-sectional area of the tube
Directly proportional to their densities
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
3.
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:
12.5 cm
6.4 cm
10 cm
8 cm
4.
The volume expansion coefficient at constant pressure (alpha_v) and the pressure expansion coefficient at constant volume (beta_p) for all ideal gases have the universal constant value of:
273.15 K
1 / 273.15 K−1 (approx. 0.00366 K−1)
1.013 x 105 Pa
8.314 J/(mol.K)
5.
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
7.5 atm
12.0 atm
1.2 atm
6.
When a gas trapped inside a rigid container of fixed volume is heated from 27 °C (300 K) to 127 °C (400 K), its pressure increases by a factor of:
127 / 27
16 / 9
2 times
4 / 3 (since P1 / T1 = P2 / T2)
7.
The volume expansion coefficient at constant pressure (alpha_v) of an ideal gas is physically measured using:
A hydrometer
Joly's bulb apparatus or Charles's apparatus with a dry mercury droplet index
A venturi meter and manometer
A torsion balance
8.
If the frequency of an AC circuit containing a capacitor is doubled, its capacitive reactance (\(X_C\)) will:
C) Decrease to half its initial value
D) Remain unchanged
A) Double
B) Quadruple
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