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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: Magnetic Field of a Straight Wire, Circular Coil and Solenoid

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1.
What happens to the magnetic flux density at the center of a circular coil carrying current I if its radius is halved while keeping the current and turns constant?
It is halved
It remains unchanged
It quadruples
It doubles (increases by 2 times)
2.
The mechanical advantage (eta) of an ideal hydraulic press equals all of the following ratios EXCEPT:
Area of the large piston / Area of the small piston (A / a)
Distance moved by the small piston / Distance moved by the large piston (y1 / y2)
Work done by the large piston / Work done on the small piston > 1
Force on the large piston / Force on the small piston (F / f)
3.
Boyle's Law states that for a fixed mass of an ideal gas kept at constant temperature, the volume V is:
Inversely proportional to its absolute pressure P (P1 * V1 = P2 * V2)
Directly proportional to absolute temperature
Directly proportional to pressure
Independent of pressure changes
4.
Real gases behave most closely to an ideal gas under conditions of:
Extremely high pressure and low temperature
High pressure and near liquefaction point
Zero gravitational acceleration
Very low pressure and high temperature (where intermolecular attraction forces and molecular volumes become negligible)
5.
A fixed quantity of an ideal gas has a volume of 600 cm3 at 27 °C. If the gas is heated to 127 °C under constant pressure, its new volume will be:
900 cm3
800 cm3
1200 cm3
700 cm3
6.
If both the absolute temperature and the absolute pressure of a confined ideal gas are doubled, the volume of the gas:
Doubles to twice its original volume
Remains constant and unchanged
Quadruples
Decreases to one-fourth
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:
6 rho (since rho is proportional to P / T)
3 rho
0.67 rho
1.5 rho
8.
In the photoelectric effect, doubling the intensity of incident monochromatic light with frequency \(\nu > \nu_c\) causes:
B) Doubling of the stopping potential \(V_s\)
C) Doubling of the number of emitted photoelectrons per second
D) A 50% decrease in the threshold frequency
A) Doubling of the maximum kinetic energy of emitted electrons
9.
The primary function of Helium gas in the Helium-Neon laser tube is to:
A) Directly emit the red laser beam at 632.8 nm
C) Cool the quartz tube by rapid convection
D) Act as a partially reflecting output mirror
B) Excite Neon atoms to their metastable state via resonant collision
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