Tawjihi (General Secondary) · Physics and Chemistry

Classical Mechanics, Electromagnetism and Modern Physics

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

Practise Classical Mechanics, Electromagnetism and Modern Physics now

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

All 47 questions

  1. A car starts from rest and accelerates uniformly in a straight line at for . What is the total displacement covered during this interval?
  2. A constant net force of acts on a crate resting on a frictionless horizontal floor. What is the acceleration produced?
  3. A circuit contains three resistors of resistances , , and connected in parallel across an ideal battery. What is the equivalent resistance of the netw…
  4. A photon has a frequency of . Given Planck's constant , what is the energy of the photon?
  5. A straight conductor of length carrying an electric current of is placed perpendicular to a uniform magnetic field of . What is the magnetic force exer…
  6. A mass of attached to a horizontal ideal spring of spring constant oscillates in simple harmonic motion. What is the angular frequency of oscillation?
  7. What is the total capacitance of two capacitors of and connected in series?
  8. According to de Broglie's hypothesis, what is the wavelength associated with an electron of momentum ? (Take…
  9. A transformer has turns in its primary coil and turns in its secondary coil. If an alternating voltage of is applied to the primary, what is the secondary output voltage (…
  10. A radioactive isotope has a half-life of days. What fraction of the original sample remains undecayed after days?
  11. An ideal gas absorbs of heat and expands, performing of work on its surroundings. What is the change in its internal energy ?
  12. A ray of light in air () strikes a glass block () at an angle of incidence of . What is the sine of the angle of refraction ?
  13. An electric immersion heater of resistance operates at for . What is the thermal energy generated?
  14. A circular wire loop of radius is placed perpendicular to a magnetic field that changes uniformly from to in . What is the magnitude…
  15. A block is released from rest at a height of on a frictionless curved track. At the bottom it slides onto a horizontal rough surface with a coefficient of kinetic fric…
  16. A battery of negligible internal resistance is connected to a resistor in series with a parallel combination of a resistor and a resistor. What is th…
  17. Light of wavelength illuminates a metal surface whose work function is . Using , what is the stopping potential?
  18. A motor lifts a load with a force of 50 N through 2 m in 5 s. What power does it develop?
  19. A motor lifts a load with a force of 20 N through 2 m in 2 s. What power does it develop?
  20. A transformer has 100 turns on the primary and 1000 turns on the secondary. If the primary voltage is 110 V, what is the secondary voltage?
  21. A 9 Ω resistor is in series with a parallel pair of 10 Ω and 40 Ω, across a 17 V supply. What is the total current?
  22. Three resistors of 8 Ω, 7 Ω and 23 Ω are in series. What is the total resistance?
  23. A gas at 5 atm occupies 8 L. At constant temperature, what volume does it occupy at 3 atm?
  24. A body moving at 6 m/s accelerates uniformly at 5 m/s² for 6 s. What is its final speed?
  25. A wave has frequency 2 Hz and wavelength 5 m. What is its speed?
  26. Two resistors of 60 Ω and 30 Ω are connected in parallel. What is the combined resistance?
  27. How much energy is needed to raise the temperature of 5 kg of water by 59 °C? (Specific heat capacity of water J/(kg·°C).)
  28. A transformer has 200 turns on the primary and 1000 turns on the secondary. If the primary voltage is 240 V, what is the secondary voltage?
  29. At a junction, currents of 2 A and 4 A flow in. What current flows out?
  30. Two resistors of 15 Ω and 10 Ω are connected in parallel. What is the combined resistance?
  31. A 500 kg car moving at 30 m/s is stopped by a constant braking force of 10000 N. What is the stopping distance?
  32. A ball is kicked at 20 m/s at to level ground. What is its range? (Use m/s², ignore air resistance.)
  33. A force of 10 N moves an object 20 m in the direction of the force. How much work is done?
  34. A 6 kg trolley moving at 4 m/s collides with a stationary 2 kg trolley and they stick together. What is their common speed?
  35. A ball is kicked at 30 m/s at to level ground. What is its range? (Use m/s², ignore air resistance.)
  36. A 2 kg crate is pulled with a force of 54 N along a floor where friction is 30 N. What is its acceleration?
  37. How much energy is needed to raise the temperature of 3 kg of water by 6 °C? (Specific heat capacity of water J/(kg·°C).)
  38. A force of 1000 N acts at right angles on an area of 5 m². What pressure results?
  39. Sound travels at 2.5 m/s. What is the wavelength of a note of frequency 10 Hz?
  40. The fundamental frequency of a string is 200 Hz. What is the frequency of its third harmonic?
  41. A body moving at 12 m/s accelerates uniformly at 6 m/s² for 6 s. What is its final speed?
  42. How much energy is needed to raise the temperature of 3 kg of water by 13 °C? (Specific heat capacity of water J/(kg·°C).)
  43. A force of 100 N moves an object 3 m in the direction of the force. How much work is done?
  44. A spring of constant 100 N/m is stretched by 0.2 m. What energy is stored in it?
  45. A gas has volume 2 L at 327 °C. At constant pressure it is heated to 27 °C. What is its new volume?
  46. A block has mass 160 g and volume 200 cm³. What is its density?
  47. A block has mass 500 g and volume 100 cm³. What is its density?

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