Wazari Exam (Iraq Baccalaureate) - Scientific Branch · Physics

Electricity, Magnetism, Optics and Modern Physics

28 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 28 questions

  1. A 12 V battery is connected across a 4 ohm resistor. What current flows?
  2. A 6 ohm and a 3 ohm resistor are connected in parallel. What is their combined resistance?
  3. A current of 2 A flows through a 5 ohm resistor. What power is dissipated?
  4. A 10 microfarad capacitor is charged to 100 V. How much energy does it store?
  5. Point charges of 2 microcoulomb and 3 microcoulomb are 0.3 m apart in air. What is the magnitude of the force between them? ( N m C)
  6. A straight wire 0.2 m long carries 4 A at right angles to a uniform field of 0.5 T. What is the force on the wire?
  7. A coil of 50 turns links a flux that falls uniformly from 0.6 Wb to 0.2 Wb in 0.1 s. What emf is induced?
  8. An ideal transformer has 200 turns in the primary and 50 turns in the secondary. A 240 V supply is connected to the primary. What is the secondary voltage?
  9. A series circuit has H and F. What is its resonant frequency?
  10. An AC supply has a peak voltage of 311 V. What is its rms voltage?
  11. An object is 30 cm from a thin convex lens of focal length 10 cm. Where is the image?
  12. Light passes from air () into glass () at an angle of incidence of 30 degrees. What is the angle of refraction?
  13. What is the energy of a photon of wavelength 500 nm? (Take eV nm.)
  14. Light of photon energy 3.1 eV falls on a metal of work function 2.0 eV. What stopping potential halts the emitted electrons?
  15. A sample of 80 g of a radioactive isotope has a half-life of 3 days. How much remains after 12 days?
  16. In a double-slit experiment nm, the slit separation is 0.4 mm and the screen is 2 m away. What is the fringe spacing?
  17. Which statement describes Lenz's law for an induced current?
  18. A 10 V supply charges a capacitor through a 2 kilohm resistor, with F. What is the capacitor voltage after 1.0 s?
  19. A particle has momentum kg m/s. What is its de Broglie wavelength? ( J s)
  20. How much energy is equivalent to a mass of 1 g? ( m/s)
  21. What is the SI unit of magnetic flux density?
  22. A 2 H inductor carries a steady current of 3 A. How much energy is stored in its magnetic field?
  23. A potential difference of 100 V is applied across parallel plates 0.02 m apart. What is the field strength between them?
  24. A 12 V battery of internal resistance 1 ohm drives a 6 ohm and a 3 ohm resistor in parallel. What power is dissipated in the 3 ohm resistor?
  25. Uranium-238 (atomic number 92) emits an alpha particle. What is the daughter nucleus?
  26. A sound wave of frequency 500 Hz has wavelength 0.68 m. What is its speed?
  27. A string 1.2 m long, fixed at both ends, carries waves at 240 m/s. What is the frequency of its third harmonic?
  28. A 100 microfarad capacitor is connected to a 50 Hz supply. What is its reactance?

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